Backend Development is a critical part of any website or software product. It starts with understanding the client's goals and developing solutions that achieve those goals in a cost-effective and scalable way. Backend developers are responsible for more than just code: they have to have a strong understanding of databases, frameworks, and development in general. A backend developer uses this knowledge to turn complicated customer requirements into a efficient, automated solutions that the user experience (UX) team can work with.

When it comes to Backend Development, experience matters - you want someone who's seen a variety of projects and knows the best technology to use for your specific scenario.

Here's some projects that our expert Backend Developer made real:

  • Developing connected systems between websites and local servers
  • Integrating software systems using modern real-time protocols
  • Building bespoke solutions tailored to customer requirements
  • Taking over existing projects and resolving tricky bugs
  • Developing custom solutions using tried and tested frameworks

Backend Development encompasses a wide variety of skills and technologies, so it helps to have an experienced developer on your team who can navigate the complexities of building high-quality solutions. Our expert developers have already undertaken a variety of different projects and can jump into yours with confidence - benefit from their expertise, get your project completed quickly and correctly, and reduce time-to-market for your product. Get in touch today to discuss bringing your project to life, or post your own project in Freelancer.com to hire an experienced Backend Developer.

Conform celor 149,526 recenzii, clienții îi evaluează pe Backend Developers cu 4.9 din 5 stele.
Angajează Backend Developers

Backend Development is a critical part of any website or software product. It starts with understanding the client's goals and developing solutions that achieve those goals in a cost-effective and scalable way. Backend developers are responsible for more than just code: they have to have a strong understanding of databases, frameworks, and development in general. A backend developer uses this knowledge to turn complicated customer requirements into a efficient, automated solutions that the user experience (UX) team can work with.

When it comes to Backend Development, experience matters - you want someone who's seen a variety of projects and knows the best technology to use for your specific scenario.

Here's some projects that our expert Backend Developer made real:

  • Developing connected systems between websites and local servers
  • Integrating software systems using modern real-time protocols
  • Building bespoke solutions tailored to customer requirements
  • Taking over existing projects and resolving tricky bugs
  • Developing custom solutions using tried and tested frameworks

Backend Development encompasses a wide variety of skills and technologies, so it helps to have an experienced developer on your team who can navigate the complexities of building high-quality solutions. Our expert developers have already undertaken a variety of different projects and can jump into yours with confidence - benefit from their expertise, get your project completed quickly and correctly, and reduce time-to-market for your product. Get in touch today to discuss bringing your project to life, or post your own project in Freelancer.com to hire an experienced Backend Developer.

Conform celor 149,526 recenzii, clienții îi evaluează pe Backend Developers cu 4.9 din 5 stele.
Angajează Backend Developers

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    Seeking Native English-Speaking Web Developers Hello everyone, We are currently looking for talented Web Developers who are native English speakers and have strong communication skills. This opportunity is ideal for developers who are not only technically capable but can also communicate effectively with clients, participate confidently in meetings, and explain technical concepts clearly. Requirements: ✅ Native-level English communication skills ✅ Experience with Web Development ✅ WordPress, PHP, HTML5, JavaScript ✅ Frontend, Backend, or Full Stack experience ✅ Professional attitude and strong work ethic ✅ Ability to work independently and collaborate with a team What we value most: • Excellent communication skills • Confidence in client-facing discussions • Pr...

    $51 / hr Average bid
    $51 / hr Oferta medie
    50 oferte
    Optimize Firestore Pagination Reads
    6 zile left
    Cont confirmat

    I’ve built an internal admin panel in TypeScript that displays data from Google Firestore. Although I’m already using cursor-based pagination and intend to fetch only 20 documents per page, the app still triggers one big read of every document in the collection, spiking usage to well over 4,000 reads on first load. You can work directly in a new repo branch I’ll provide or supply isolated snippets—whatever makes the fix fastest to drop in. I need this fixed within one hour if possible.

    $30 Average bid
    $30 Oferta medie
    46 oferte

    I'm looking for an experienced Kbmax and Epicor CPQ expert to help build 53 models based on 3 samples provided by the Epicor team. The work involves parameter adjustments and custom UI design, aligning with our specific requirements. While I don't have detailed documentation, I can provide examples for guidance. Additionally, these models will require full integration with our cloud kinetic environment. Ideal candidates should have experience with Kbmax, Epicor CPQ, and system integration.

    $41 / hr Average bid
    $41 / hr Oferta medie
    26 oferte

    Hello, Thank you for sharing the detailed requirements for Hijra+. I carefully reviewed the project scope and I believe I can deliver a scalable MVP that meets your current requirements while preparing the platform for future expansion. My recommended technology stack: • Mobile Applications: .NET MAUI (Android & iOS from a single codebase) • Backend API: ASP.NET Core Web API • Database: SQL Server / Firebase (depending on scalability requirements) • Real-Time Chat: Firebase Realtime Database or SignalR • Push Notifications: Firebase Cloud Messaging (FCM) • Authentication: Secure JWT-based Authentication • Admin Panel: ASP.NET Core MVC / Web Dashboard The MVP will include: Guide Booking System Guide Approval Workflow Real-Time In-App Chat Ima...

    $479 Average bid
    $479 Oferta medie
    53 oferte
    Deploy React Sites To Hostinger
    6 zile left
    Cont confirmat

    I will supply three separate React codebases from GitHub, each mapped to its own domain already registered inside my Hostinger account. What I need is a clean end-to-end deployment on Hostinger’s infrastructure so all three sites load live under their respective domains. Please keep every existing environment value, build flag, and configuration that you find in the repos—those settings are already proven in staging and must remain intact. Each project also connects to at least one database; I’ll provide the credentials once the hosting is ready. I’m not yet certain whether the back-end is MySQL, PostgreSQL, or another engine, so I’ll rely on your guidance when we verify the connection during setup. Deliverables • All three React apps compiled, hosted...

    $125 Average bid
    $125 Oferta medie
    162 oferte

    I need a standalone chat module that plugs into my existing Worker Online platform so employers and workers can talk instantly without ever leaving the site. The core requirement is true real-time messaging—no page refreshes, no polling delays—so WebSocket technology such as , Pusher, Firebase Realtime DB, or a similarly reliable solution is essential. Key capabilities I must see in the finished module • One-to-one conversations that appear instantly on both sides • Secure file sharing inside the chat window (PDF, DOC, image and video attachments up to a configurable size limit) • Typing indicators, online/offline status and message timestamps • Scalable architecture that keeps messages synced across web and mobile views • Clean, responsive U...

    $456 Average bid
    $456 Oferta medie
    194 oferte

    I want to build a clean, intuitive mobile app where users can browse and buy second-hand clothing—everything from laid-back tees to smart blazers. Because the catalogue will be a mix of both casual and formal pieces, the interface should let shoppers filter quickly by style, size, brand, price, and condition. The app needs to run natively on iOS and Android, sharing as much code as practical (React Native or Flutter are fine, but I’m open to your recommendation). I’m not in a rush; quality and maintainability matter more than speed, so we can agree on realistic milestones together. Core flow: • Seller uploads photos, adds basic details, and sets a price. • Listings appear in a scrollable feed with search and advanced filters. • Buyers add items to a c...

    $9 Average bid
    $9 Oferta medie
    9 oferte

    I’m building out the backend for a new product-oriented platform and need a Django specialist to craft a clean, scalable REST API. The core stack is Django + Django REST Framework with JWT for stateless authentication, all backed by MySQL. Scope of work • Authentication: implement registration and login strictly via email + password, issuing JWT access and refresh tokens. • Resources: expose a Products model with full CRUD endpoints secured behind the JWT layer. • Code quality: follow DRF best practices, modular app structure, environment-based settings, and thorough error handling so the codebase is easy to extend for upcoming mobile clients. • Documentation: auto-generate endpoint docs (Swagger or Redoc) straight from the code so future teams can onboar...

    $36 / hr Average bid
    $36 / hr Oferta medie
    166 oferte

    Need: Full-Stack Developer for AI Data Ingestion & Analytics Dashboard (Phase 1 MVP) Project Overview We are launching an adaptive AI intelligence platform designed to follow an individual’s professional journey. We are skipping static design mockups and building a functional, code-first Phase 1 MVP to present to institutional investors. The core objective of this MVP is to demonstrate a seamless, intelligent Live Data Transformation Flow: taking raw, messy user data and instantly turning it into a structured database asset that generates dynamic career analytics. Target Tech Stack (Open to Recommendations) Backend: Python (FastAPI / Django) or Node.js Database: PostgreSQL or MongoDB AI Integration: OpenAI API (utilizing Structured Outputs / JSON Mode) Frontend: React, Vue....

    $6905 Average bid
    $6905 Oferta medie
    180 oferte

    I need an experienced Optimizely backend developer to help add new features to our platform. The key areas for enhancement are: User Authentication: Implement robust user authentication mechanisms to secure our platform. Content Management: Develop advanced content management features to streamline content creation and organization. Social Media Integration: Integrate with various social media platforms to enhance connectivity and content sharing. Ideal Skills and Experience: Proficient in Optimizely backend development. Strong experience in user authentication and content management systems. Familiarity with social media APIs and integration. Excellent problem-solving skills and attention to detail. If you have a track record of successfully adding features to similar platforms, I�...

    $36 / hr Average bid
    $36 / hr Oferta medie
    106 oferte
    Gym Portal UI Development
    6 zile left
    Cont confirmat

    I need a gym user interface portal that allows for user registration and login. The portal should accommodate three user roles: Regular Members, Trainers, and Administrators. Essential Features: - Regular Members should be able to: - Renew membership - View workout plans - Track progress Ideal Skills and Experience: - Proficiency in UI/UX design - Experience in developing role-based access systems - Strong backend development skills to support user data and progress tracking Looking for a developer who can create an intuitive, secure, and efficient portal. Please provide examples of similar work done.

    $1126 Average bid
    $1126 Oferta medie
    46 oferte

    We are an e-commerce subscription business looking for a skilled, reliable, and long-term developer to join our team. **Our tech stack:** - React (frontend) - Supabase (backend) - Mollie (payment provider) **Requirements:** - Strong experience with React, Supabase, and Mollie - E-commerce experience, especially with subscription/recurring billing systems - All code must be saved on GitHub at all times — no exceptions - Available Monday to Sunday for urgent issues (response within 1-2 hours) - Good English communication skills - Comfortable with video calls for onboarding and project discussions - Must provide references or examples of similar projects **Immediate task:** Review our Supabase backend and subscription system — verify that all subscriptions are correctly saved, ...

    $192 Average bid
    $192 Oferta medie
    286 oferte

    I want to launch a web-based marketplace that works much like Freelancer, but it will cater exclusively to two user groups: influencers and brands. The flow is straightforward—brands post campaigns or one-off collaborations, influencers browse and bid, and both parties communicate through a built-in messaging system until a deal is struck. Core features I need developed: • User profiles for both influencers and brands, each with tailored fields (audience size, niches, past collaborations for influencers; campaign details and budget ranges for brands). • A posting area where brands create projects and influencers can submit proposals or quotes. • A real-time messaging system tied to each project so negotiations stay organized. The build is web-only for now, so ple...

    $146 Average bid
    $146 Oferta medie
    60 oferte

    AI-Powered Smart Rental Platform (Flutter + FastAPI + LLM) Project Description We are looking for an experienced Full Stack AI Developer to build an intelligent rental platform that combines mobile development, backend APIs, recommendation systems, and Large Language Models (LLMs). The goal is to create a modern housing application where users receive personalized property recommendations instead of browsing endless listings. Main Features • Flutter mobile application • Firebase Authentication & Firestore • Property listing and management • AI-powered property recommendation engine • Semantic search using natural language • LLM chatbot for rental assistance and property suggestions • Favorites and personalized recommendations • Admin dashboard AP...

    $578 Average bid
    $578 Oferta medie
    151 oferte
    Monetizable OTT Platform Development
    6 zile left
    Cont confirmat

    I’m ready to take my video catalogue to a full-scale OTT service and need someone who can carry the build all the way through to launch and revenue generation. The platform must stream smoothly on smartphones and tablets, work elegantly in any modern web browser, and have dedicated Smart TV support. A single, secure sign-in is essential—users only need to authenticate; individual sub-profiles are not required at this stage. Beyond the core playback experience, I’ll rely on you to: • architect a robust backend (CMS, transcoding pipeline, DRM, CDN integration, analytics) • craft polished front-end apps for mobile, web, and major TV operating systems • embed monetisation options—subscriptions, pay-per-view, ad insertion, or any blend that best fits...

    $10 / hr Average bid
    $10 / hr Oferta medie
    58 oferte

    We are looking for a Full Stack Engineer to help us with a small improvement task in our existing SaaS project. We already have a working application built with React and Node.js. We now need a developer to fix a few backend issues and implement a small new feature in our API layer. Tasks include: Debug and fix a few Node.js backend issues Improve or refactor existing REST API endpoints Add one small new feature to the backend (we will explain after hiring) Ensure smooth integration with the existing React frontend Clean, maintainable code changes only (no redesign required) This is a small, focused task for an experienced developer who is comfortable jumping into an existing codebase.

    $140 Average bid
    $140 Oferta medie
    287 oferte
    Android MDM Integration Specialist
    6 zile left
    Cont confirmat

    I have an enterprise mobility project that hinges on solid Mobile Device Management for a fleet of Android tablets and phones. I need one person who can move comfortably between hands-on Android coding and backend systems integration. On the Android side, you will work with Device Owner APIs, Android Enterprise, and the latest SDK features to create (or extend) an agent that handles enrollment, remote configuration, policy enforcement, and secure app distribution. Custom UI work is minimal; the focus is on reliable background services, zero-touch enrollment, kiosk mode, remote wipe, and compliance checks. On the integration side, you will stitch this agent into our existing infrastructure through RESTful APIs and webhooks. That includes authenticating against our identity provider, pushi...

    $272 Average bid
    $272 Oferta medie
    95 oferte

    SMM Script Security Hardening, Dynamic 8-Theme Integration & Logic Fixes We need an expert PHP/Backend developer to apply precise security patches, link our hidden themes, and fix logic bugs in our digital growth agency script via cPanel. Full technical counter-audit is ready. Core Tasks: 1. Dynamic 8-Theme Registration & UI Overhaul: The file system has 8 theme folders in 'app/views/', but the Admin UI currently only renders 4. You must write the missing database hooks/routing logic to register and fully activate all 8 themes in the Admin Panel so I can change the website look instantly in 1 second. Fix sidebar/layout issues across these layouts. 2. Captcha Validation Logic Fix: Fix the broken, inverted Captcha verification logic on 'app/controller/' (Line 59...

    $82 Average bid
    $82 Oferta medie
    40 oferte

    Hi, I am from Nagpur and I am looking for a developer who can work on our website []. The website design/frontend is already available. We need to complete the E-Commerce functionality such as: * Customer Login & Registration * Payment Gateway Integration * Shiprocket Integration * Order Management * Order Tracking * Admin Dashboard * WhatsApp Order System (for Nagpur) Before discussing further, please let me know: 1. Are you from Nagpur or nearby? 2. Have you worked on E-Commerce websites before? 3. Can you review our existing website and suggest the best approach? 4. What would be the approximate cost and timeline? Thank you.

    $97 Average bid
    $97 Oferta medie
    97 oferte

    I need a web-based trading platform that I can fully manage from an admin console. After a quick email-and-password signup, each user should automatically receive both a profile and a unique, custodial wallet address. At launch the platform will handle Bitcoin and Ethereum; the codebase must be structured so I can add further coins later without a full rewrite. Key functions I must have as the administrator: • Real-time dashboard showing every registered account, current balances, recent deposits, and withdrawal requests. • Ability to push crypto from a master wallet into any user wallet on demand. • Withdrawal workflow that blocks release of funds until the user pays a configurable fee I set in the backend. User-side essentials: • Responsive trading interface for...

    $390 Average bid
    $390 Oferta medie
    75 oferte

    A web-based wallet management system for B2B operations with a two-bucket balance model. The system should track and manage prepaid customer credits split into two categories: a Minimum Monthly Commitment (MMC) bucket and an Advance bucket, with defined consumption priority rules, done using python. Core Features Required: Customer wallet creation and management Two-bucket balance model (MMC + Advance) with MMC consumed first Transaction logging (credits, debits, adjustments) Wallet top-up and balance deduction flows Dashboard showing wallet balances per customer Basic reporting (transaction history, low balance alerts)

    $82 Average bid
    $82 Oferta medie
    38 oferte

    I’m in the middle of a Python-based web development project and need an extra set of expert hands to move things forward. The core of the work is straight-up Python coding: wiring up new views, tightening backend logic, and making sure everything runs smoothly in the browser. Here’s the situation: the existing project is already laid out, but a few key features still need to be built, refactored, or debugged. I’d like you to dive into the current repository, review the structure, then implement or improve modules as we agree. Whether you prefer Django, Flask, or another lightweight framework is fine—as long as the solution is clean, well-documented, and production-ready. Deliverables • Updated Python source that drops straight into the repo without breaking...

    $6 / hr Average bid
    $6 / hr Oferta medie
    38 oferte
    Continue SaaS ERP Development
    5 zile left
    Cont confirmat

    I am already more than halfway through building a multi-tenant ERP platform offered as SaaS. The current stack is React on the front-end with a Node.js (Express) API, and subscription payments are flowing through an integrated payment-gateway module. What’s left is to finish the remaining business-logic layers, tighten up the UI, and prepare the whole product for production release. I’ll give you access to the existing Git repository, detailed module road-maps, and the payment gateway keys already in place. Your job is to pick up the codebase, complete the unfinished modules, squash any bugs you find, and push clean, well-commented commits back to the repo. Key expectations: • Keep everything in React + Node.js, following the existing component and controller patte...

    $488 Average bid
    $488 Oferta medie
    250 oferte

    I need a full-featured, web-based employee management system that my HR team can open in any modern browser. The application must include three core modules: attendance tracking that records clock-ins/outs in real time, payroll management that calculates salaries, deductions and exports payslips, and a performance review section where managers can log goals and appraisal notes. Access to the system should be protected with straightforward email/password authentication; a simple registration screen for admins and a secure login page for staff are all that’s required right now. Please build the back-end and front-end, wire them together, seed it with sample data and give me clear instructions on how to deploy it to our own server. I’ll consider the project complete once I can: ...

    $3 / hr Average bid
    $3 / hr Oferta medie
    62 oferte
    Pickleball League Backend with Node.js
    5 zile left
    Cont confirmat

    I’m building a full-featured website for our new pickleball league and need an experienced backend developer to bring the real-time pieces to life. The stack is already chosen: Node.js (Express or NestJS) with PostgreSQL as the primary database. Core tasks • Live player auctions – real-time bidding, instant bid notifications, and a full auction history log powered by Socket.IO. • Live match scoring – endpoints that push each team’s score and stats seconds after every rally so the front-end can update instantly. • Secure auth – JWT sessions plus OTP or token-based magic-link login for captains, admins, and bidders. • Media handling – upload player photos and team assets straight to AWS S3 (or Cloudinary if you prefer) and stor...

    $87 Average bid
    $87 Oferta medie
    46 oferte

    I need a polished, DAT-style platform that lets freight brokers, manufacturers and carriers quickly locate one . The first gate is classic Email-and-Password authentication; once inside, users should land in an interface that feels familiar to anyone who has worked with DAT—clean load boards, clear typography and data-dense tables optimised for desktop and mobile. Core workflow centres on an advanced, filter-rich search and match engine. A broker might filter by trailer type, lane, capacity date or equipment specs and receive instant, ranked matches. Likewise, a carrier can zero in on loads that fit dead-head radius, weight limits and preferred rates. The experience must be lightning fast and return precise results—even as the database grows. At launch I only need the search-...

    $85 Average bid
    $85 Oferta medie
    74 oferte

    FellahDZ is a comprehensive digital marketplace and logistics solution tailored for the Algerian agricultural sector. The platform solves a major supply chain challenge by seamlessly connecting farmers and agricultural producers with certified local and regional transporters. Key Features & Architecture: - Dynamic Marketplace: Allows farmers to list products and transportation needs, while enabling transporters to offer their services and optimize their routes. - Robust Backend: Built with Supabase for real-time data management, secure user authentication, and scalable relational database architecture. - Frontend & UI: Developed a highly responsive, modern multi-lingual user interface (including French) deployed seamlessly on Vercel for optimal performance. - Optimization: Focused...

    $199 Average bid
    $199 Oferta medie
    110 oferte

    I’m creating “Jaya jaya,” a social-networking mobile app. For this first release I need a developer who can take the idea from blank screen to a working build that lets people sign up, create rich user profiles (photo, bio, interests, basic privacy settings), and browse other members’ profiles smoothly. Core scope • Design and implement onboarding, authentication, and profile-creation flows. • Store profile data securely in a scalable back end (Firebase, Supabase, or a stack you recommend). • Deliver clean, well-documented code in React Native or Flutter so the app runs on both iOS and Android. • Provide clear instructions for building and deploying the app. Nice-to-have (not required for this milestone but keep the architecture ready):...

    $38 / hr Average bid
    $38 / hr Oferta medie
    141 oferte

    I’m launching a web-based social network aimed at helping friends and family stay connected, and I need the full site designed, built, and made ready for production. The platform must go beyond a simple prototype—every feature has to be stable, secure, and efficient so we can scale quickly once users start signing up. Below are the non-negotiable deliverables for the first release: • User profiles with photos, bios, privacy controls and activity timelines • Real-time messaging (one-to-one and group) with notifications • Algorithmic news feed where users can post, react, comment and share • Live streaming so members can broadcast instantly from any device • Marketplace module for peer-to-peer listings, offers, and in-app payments On top of t...

    $626 Average bid
    $626 Oferta medie
    128 oferte

    I need a skilled backend developer to build and deploy a secure user-authentication and management service written in Node.js and hosted on Google Cloud Platform. The project is green-field, so you’ll be setting up everything from the ground up: server environment, database connection, and the authentication flow itself. What I expect • A clean, well-structured Node.js codebase that exposes REST (or GraphQL, if you prefer) endpoints for sign-up, login, password reset, refresh tokens and role-based access. • Deployment to GCP using the service you judge best (Cloud Run, App Engine, GKE, etc.) with environment variables managed safely and logs viewable in Cloud Logging. • A small, automated CI/CD pipeline so updates go live with minimal downtime. • Clear, d...

    $253 Average bid
    $253 Oferta medie
    96 oferte

    I already host an open-source platform in a SaaS environment and now need it tailored so it follows my product vision more closely. The codebase itself is solid; the next step is to adjust it and bolt on the right integrations so the service feels seamless to end-users. Core focus • Map my business logic to the existing code, refactoring only where absolutely necessary so future upgrades remain straightforward. • Build out secure, well-documented connections to the external services I specify (think payment, CRM, email or other APIs—I’ll confirm the exact stack with you once we start). • Keep the UI intact for now; this phase is all about reliable third-party integrations and the back-end hooks that make them work. Process I have in mind 1. Review the c...

    $3782 Average bid
    $3782 Oferta medie
    267 oferte

    I’m building a lightweight Android app to keep daily ground-booking records tidy and every rupee traceable. For this first phase I only need the core account system in place so the rest of the product can grow on solid ground. The flow is simple: new users create an account with an email-and-password pair, supplying just a username and their email address. Once inside, they land in the standard user area. An Administrator account gets its own dashboard where I can view bookings, update them, and monitor incoming payments; no charts or calendars yet, just clear tables I can edit. A separate Moderator role also has to exist now so I can later delegate basic oversight tasks without full admin privileges. Security matters, so apply current best practices—hashed passwords, secure ...

    $22 / hr Average bid
    $22 / hr Oferta medie
    153 oferte

    I’m updating my portfolio site for InventoryGPT and need a fresh hero section that feels truly minimalistic while instantly telling visitors what we do: use AI to predict demand and optimize stock levels. The copy is ready, so your focus is on layout, typography, spacing, and a single standout call-to-action button. A subtle illustration or abstract graphic is welcome if it stays light and uncluttered, but the design must keep plenty of white space and direct attention straight to the headline and CTA. Deliverables • Figma (or comparable) source file with well-named layers • Desktop and mobile versions • Export-ready SVG/PNG assets for any custom graphics • Quick hand-off notes covering fonts, colours, and spacing Acceptance criteria 1. Hero sho...

    $543 Average bid
    $543 Oferta medie
    65 oferte

    I need a complete e-commerce website built from the ground up. I’m looking for someone who can take charge of the full development cycle—planning, design, front-end, back-end, and deployment—so the store is ready for customers. At the core I’ll need a clean, modern storefront that lets shoppers browse products and proceed smoothly through checkout. I haven’t locked down every individual feature yet, so I value your guidance on the best mix of catalog, cart, payment, and customer-account functionality to launch with. You’ll advise on the right tech stack, set up a scalable architecture, and implement responsive design so the site performs well on desktop and mobile alike. Security, speed, and ease of future expansion are priorities. Deliverables ...

    $253 Average bid
    $253 Oferta medie
    145 oferte

    Key Components of the Diagram UI (User Interface): This represents the frontend of the application or website. It is the visual layer where users interact, click buttons, or input data. App (Application/Server Logic): This is the backend or middleware. When a user takes an action on the UI, the request is sent to this component to process the business logic. DB (Database): This represents the data storage layer. It safely stores user credentials, profiles, and all other application data. The 'App' layer communicates with it to fetch or save information. Flow Lines (Arrows): The arrows connecting these boxes illustrate the direction of the Data Flow (e.g., UI ➔ App ➔ DB) and how different parts of the system communicate with each other. System Description This diagram illustrates ...

    $5 / hr Average bid
    $5 / hr Oferta medie
    22 oferte

    I need a single code-base solution that ships to both the App Store and Google Play. The project is a utility-style application, not e-commerce or social media, so the focus is on streamlined functionality rather than heavy UI flourishes. Core requirements • Secure user authentication that keeps credentials safe and allows account recovery. • Real-time push notifications delivered instantly, even when the app is in the background. • Reliable data synchronisation so a user can pick up on one device exactly where they left off on another. I’m open to React Native, Flutter, or any other modern cross-platform stack as long as it achieves native-level performance. Clean, well-commented code and a short hand-off session at the end are important to me so I can maintai...

    $49 Average bid
    $49 Oferta medie
    34 oferte

    I need a skilled developer to integrate the IBKR API with Pydantic models, focusing on financial transaction data. Step 1. Basic Prototype. Let's build a relationship and grow together if we're both happy. Key tasks include: - Integrate IBKR API for: - Ticker information - Historical data - Real-time quotes - Data validation and parsing using Pydantic -backtesting Ideal skills and experience: - Proficiency in Python, Pydantic, and API integration - Familiarity with IBKR API and financial data - Strong error handling and logging capabilities

    $504 Average bid
    $504 Oferta medie
    206 oferte
    KDP Manuscript Formatter
    4 zile left
    Cont confirmat

    I need a Python backend developer to create a manuscript formatting web app. Users will upload a Word document, and the app will auto-reformat it to meet Amazon KDP print specifications using python-docx. The frontend is already built, and Stripe is integrated. The processed manuscript should be available for download in Microsoft Word (DOCX) format. Key requirements: - Change margins, page size, font style, size, and header/footer settings. - Provide on-screen confirmation message upon successful processing. Ideal skills and experience: - Strong Python and python-docx knowledge - Experience with web app development - Familiarity with Amazon KDP formatting specifications is a plus I am building KDP NOW, a web app that accepts manuscript uploads and automatically reformats them to Amazon...

    $760 Average bid
    $760 Oferta medie
    173 oferte

    Tingum is a mobile marketplace platform connecting clients with local taskers (similar to TaskRabbit). Users can post jobs, hire taskers, handle payments via wallet/escrow, approve materials, and complete jobs. Our website is a simple landing page that directs users to download our mobile app (iOS/Android). All marketplace functionality lives in the mobile app, which consumes our backend API. We are a small team with a working MVP. The backend is 90% complete. We need an experienced backend developer to finish the remaining critical API endpoints and database logic so our mobile app developer can complete the app. SCOPE OF WORK - COMPLETE BACKEND COMPLETION: PHASE 1 - CRITICAL FIXES: 1. Escrow Release API - Create endpoint POST /api/jobs/release-escrow to transfer funds from job escrow...

    $19 / hr Average bid
    $19 / hr Oferta medie
    147 oferte

    Are you looking to transform your ideas into a high-performing, modern, and application? I am a dedicated Full-Stack Developer specializing in building fast, responsive, and secure web applications using the React ecosystem and Firebase. From clean UI implementation to robust backend integration, I focus on delivering seamless digital experiences that align perfectly with business goals. Core Technical Skills: Frontend Development: React.js, Vite, JavaScript (ES6+), HTML5, CSS3, Tailwind CSS. Backend & Cloud Services (Firebase): Firestore Database, Realtime Database, Firebase Authentication (Google OAuth), Cloud Storage, and Firebase Hosting. Tooling & Ecosystem: Git/GitHub, Project IDX, npm/yarn, and RESTful APIs. What I Can Do For You: Build complete, production-ready Sing...

    $98 Average bid
    $98 Oferta medie
    82 oferte

    build a Buy-Now-Pay-Later program and need an Android-only locking solution that automatically enforces our repayment terms. Whenever a user misses a scheduled instalment the app must immediately: • trigger a full device lock that prevents normal use until the outstanding balance is cleared; • display a clear, non-dismissible reminder screen guiding the customer to our payment portal. The lock should revert as soon as my server confirms settlement. A lightweight admin console or secure API endpoint is required so my team can push payment-status updates, unlock commands, and view basic device telemetry. Code must be resilient against rooting or factory-reset attempts and comply with Google Play policies for Device Admin / Device Owner apps. Deliverables 1. Android Stu...

    $595 Average bid
    $595 Oferta medie
    162 oferte
    Blueprint AI Platform
    4 zile left
    Cont confirmat

    I want to build a modern web-based platform similar to Business Blueprints (example: ), but significantly more advanced and AI-powered. The platform will allow individuals, consultants, teams, and companies to create, edit, collaborate on, analyze, and share visual blueprints for any purpose, including: Business Processes Workflows SOPs (Standard Operating Procedures) Department Processes Company Structures Organizational Charts Project Plans Construction Plans Manufacturing Processes HR Processes Sales Funnels Customer Journeys Strategic Plans Operational Plans Training Programs IT Architectures Personal Goal Plans Any custom process, system, plan, or workflow. The platform should work as a universal blueprint builder rather than being limited to business processes only. Main Goal: Cr...

    $266 Average bid
    $266 Oferta medie
    356 oferte

    I need an experienced developer to make changes and customizations to an AI-generated website. Key Tasks: - Improve design - Add functionalities like user authentication and third-party API integrations - Update existing content - Ensure smooth integrations with current systems Ideal Skills and Experience: - Strong background in web development - Proficiency in implementing user authentication and API integrations - Experience with design modifications on existing websites - Familiarity with content management systems for seamless content updates Please provide examples of similar work done. Thanks!

    $5 / hr Average bid
    $5 / hr Oferta medie
    53 oferte

    I want to launch a fully-functional online freelancing marketplace from the ground up. The project covers everything from the first line of code to a working production release, so I need someone who can guide architecture decisions, develop the core features, and handle deployment. At a minimum the finished product should allow clients to post work, freelancers to create public profiles, and both parties to transact securely within the site. I’m open to your preferred tech stack—Laravel, Node, Ruby on Rails, or a modern serverless approach are all on the table—as long as it remains scalable and straightforward to maintain. A clean, intuitive UI is essential; I would like the front-end to feel as polished as any leading marketplace, whether you build it with React, Vue, ...

    $22 / hr Average bid
    $22 / hr Oferta medie
    99 oferte

    I am building SmartCut AI, a virtual receptionist for barbershops that handles appointment scheduling automatically. The main goal of the MVP is simple: Clients should be able to book appointments either by phone call or through a simple online booking form, and the system should manage everything in one central calendar. For phone calls: The system should answer, understand basic booking requests, and schedule appointments automatically. For online bookings: A lightweight embeddable widget (Wix/WordPress compatible) is enough as long as it connects to the same scheduling system. All appointments should sync with Google Calendar to avoid double booking. I have a clear vision for the UI design, including modern 'glassmorphism' aesthetics. I am open to your recommended tech sta...

    $25 / hr Average bid
    $25 / hr Oferta medie
    221 oferte

    I’m preparing to launch an online shop that will sell physical products only, and I’d like the entire store built from the ground up—no Shopify or WooCommerce themes, just clean, maintainable custom code. The finished site must feel fast, look modern on all devices, and include these core features from day one: • Robust product search with intuitive filters • Customer reviews and star-ratings on every product page • Seamless shopping cart flow and a secure, multi-step checkout You’re free to choose the back-end stack you’re most comfortable with as long as it supports easy inventory updates, order management, and integration with major payment gateways and shipping APIs. Clear documentation, modular code, and a short hand-over call a...

    $263 Average bid
    $263 Oferta medie
    98 oferte

    I need a web-based marketplace where employers can post projects and independent freelancers can apply, communicate, and build reputations—all wrapped in a modern, clean interface that feels effortless on desktop and mobile alike. Here is what the first release must do: • Job posting & application flow: employers create openings, freelancers submit proposals, and both parties manage status updates in their dashboards. • Rating & review engine: once a job is marked complete, each side leaves feedback that rolls into a public profile score. • Built-in messaging: real-time or near-real-time chat so discussions stay on-platform. Please design the UI with a minimalist, contemporary look—ample white space, intuitive navigation, and responsive layout...

    $250 Average bid
    $250 Oferta medie
    78 oferte
    Custom Options Screener Development
    4 zile left
    Cont confirmat

    I want to build a specialized options screener that filters contracts in real-time based on two main criteria: raw price and volume data. My goal is to display only those strikes that meet dynamic thresholds—which I can adjust as needed. The back-end logic is the priority. I need reliable data ingestion (preferably from Upstox API), a rules engine where I can add or modify filters without altering the core code, and an interface that clearly displays the resulting option chains. The screener should include functionality for time frames of 15 minutes and 1 hour. Deliverables: • Clean, well-commented source code for the screener • A configuration file or panel to adjust price, volume, and volatility thresholds • A brief setup guide and a Loom-style walkthrough so I can...

    $21 Average bid
    $21 Oferta medie
    12 oferte

    I am ready to commission a complete project that combines two tightly linked goals. First, I need a robust, modern web app built from the ground up. Software & App Development is the primary focus, so I am expecting clean, well-documented code, a scalable backend, and a polished, responsive frontend that works seamlessly across devices. Second, the launch must be supported by a full brand identity package. This includes everything from a distinctive logo and color palette to typography, iconography, and a concise style guide that the development team can apply directly to the interface you create. To keep things clear, here is what I will look for at delivery: • Web application: production-ready build, source code repository, and short deployment guide. • Brand ident...

    $32 Average bid
    $32 Oferta medie
    63 oferte

    I am looking for an experienced app developer or development team to build a complete mobile application from the initial idea stage through to final launch on the App Store and Google Play Store. The project will require support with: * App planning and feature clarification * UI/UX design * Mobile app development * Backend/admin panel development * Testing and bug fixing * App Store and Google Play submission * Post-launch support and maintenance I am looking for someone reliable who has successfully launched public apps before. Please DM me with: 1. Your estimated timeline from start to final launch 2. Your rough cost estimate 3. Your development process 4. Your actual portfolio 5. Links to apps you have built that are currently live on the App Store or Google Play 6. Whether you c...

    $637 Average bid
    $637 Oferta medie
    94 oferte

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