Backend Development for Email B2B Web App

@Microlent

Hello, I am Dr. Rajesh Rolen, PhD in Computer Science & Engineering, with experience of over 20+ years in PHP, MySQL, Backend Development, HTML, Software Architecture As a preferred freelancer in the top 1%, I have done 400+ projects here on freelancer.com, I have 4.9 ratings out of 5 on average, which showcases my quality of work and timely delivery. Key Highlights: - Free Hosting Support on the Cloud or any desired platform. - Free 3 months of post-delivery support to ensure that our client doesn’t face any challenges after the launch of the project. - Free Dedicated tester on projects to ensure quality delivery, so clients don’t need to act as a tester. - 10+ Years experience UI/UX team to ensure intuitive UI. Portfolio: https://www.freelancer.com/u/Microlent Please open the chat and send me a message, so we can have a more detailed discussion about the project to give you the project timeline and cost. Thank you for considering my services. I look forward to engaging in a productive conversation and understanding how I can be of assistance in bringing your project to life. Regards Rajesh Rolen

@diektech

Hi — Elias here from Miami. I understand you’re looking to develop a backend for your email B2B web app, focusing on solid functionality and integration. The goal here is to ensure a reliable and efficient system that can support your business operations. What usually matters most here is the scalability and maintainability of the backend architecture. A common issue in systems like this is managing user roles and permissions effectively, especially as your user base grows. The tricky part is usually ensuring that the integration with third-party services, like OpenAI for automation, is seamless and doesn’t create bottlenecks. My approach would involve using PHP and MySQL to build a robust API that can handle your specific workflow requirements. I’d prioritize clean code and modular design to facilitate future updates and expansions. I have experience with similar projects, which helps in anticipating potential pitfalls. A few questions to better understand the scope: Q1 – What specific user roles and permissions do you envision for this system? Q2 – Are there any particular third-party integrations you have in mind for email services? Q3 – How do you plan to handle data security and compliance for user information? Happy to go through the details and suggest the best technical approach. Looking forward to hearing from you.

@OutsourceMan

Hi, CnEL India can build this B2B procurement MVP with a structured backend and AI-assisted quote processing workflow. Our methodology: * Define authentication, supplier, RFQ and quotation data models. * Build Supabase Auth with secure user access and supplier CRUD. * Develop the RFQ campaign builder with product, quantity, budget, deadline and supplier selection. * Integrate Resend/Postmark/SendGrid for personalized outbound RFQ emails. * Configure inbound email webhooks to capture supplier replies and attachments. * Store PDF/Excel quotations securely in Supabase Storage. * Use OpenAI structured extraction to convert quotation data into consistent fields: price, currency, lead time, shipping/Incoterms and payment terms. * Add validation and human-review handling for unclear or incomplete extraction. * Build the comparison matrix with clear quote status and configurable comparison logic. * Generate editable AI counter-offer drafts using the quotation context. * Implement API validation, error handling, logging and secure data access. * Test email delivery, webhooks, attachments, extraction accuracy and end-to-end RFQ workflows. * Deploy with environment configuration and documentation. We can start with the database/API architecture, then build RFQ/email workflows, AI extraction, comparison UI and final testing.

@ykarora26

With extensive experience in full-stack development and AI automation, I understand your need for a B2B procurement web app that automates the RFQ process. My expertise in building user authentication systems and integrating AI APIs align perfectly with your requirements. Can you share more details about the desired scalability of the system and potential integrations with existing procurement tools? Regards, Yogesh Kumar

@raheel2k29

Hello, I can build the backend/MVP for your B2B procurement application, including RFQ campaigns, supplier management, inbound email processing, AI quote extraction, real-time database updates, comparison logic, and AI-assisted counter-offer drafts. I’ll provide clean, maintainable TypeScript/backend code rather than a prototype that only works for the initial demonstration. The first thing I’d like to review is your expected email provider/inbound-email setup and a few representative supplier quotation PDFs/Excel files. Those examples are particularly important because they determine how robust the extraction and normalization layer needs to be. I can start with the Supabase schema and RFQ workflow and build the remaining automation incrementally. Best regards Raheel

@installerpoint

Hello, I’m interested in building the MVP for your B2B procurement and RFQ platform. The workflow you described—RFQ distribution, inbound supplier email processing, AI extraction, quote comparison, and human-reviewed counter-offers is a strong fit for a modern TypeScript/Supabase architecture. The key priority will be making the entire RFQ → supplier reply → AI extraction → comparison workflow reliable and easy to extend as the product grows. I’m ready to start and can work directly with your preferred Supabase, email provider, and OpenAI setup. Best regards ADEEL

@ZohaibRoy

As a seasoned Full Stack Developer with a keen interest in Artificial Intelligence, I believe I would be the perfect fit for your B2B email web app project. Over the course of my 5+ years in Python development, I have honed my skills in Full Stack Web Technologies, Machine Learning, and Automation - all of which are highly relevant to your project's backend requirements. In regards to the specific functionality you're looking for, I can assure you that I'm well-versed in building applications that incorporate supplier interactions and API integrations, which aligns perfectly with your app's RFQ Campaign Builder and Inbound Parsing needs using AI-powered extraction. Given your preference for Lovable/Bolt/Supabase/FastAPI, my extensive work on these tech stacks will undoubtedly provide the necessary expertise your project requires. Moreover, I have a practical understanding of handling email communications via transactional email platforms such as Resend and Postmark. My familiarity with OpenAI API solidifies my ability to parse incoming emails and attachments precisely, updating the data accurately and in real-time. Lastly, leveraging on my experience in creating clean, user-friendly interfaces, I'm confident in designing a Live Comparison Matrix that effectively ranks top quotes while generating context-aware counter-offer drafts to facilitate efficient procurement negotiations.

@WebTechDesignBG

Hello, I see you're looking for help with building a B2B procurement web app that simplifies the process for procurement managers to request and compare quotes from multiple suppliers. With my 7+ years of experience in backend development and AI automation, I can create an effective MVP that seamlessly integrates user authentication, email dispatch, and AI-driven parsing of supplier responses. My approach would include setting up a user-friendly dashboard, implementing the RFQ campaign builder, and utilizing OpenAI's API to extract relevant data from incoming quotes. This will allow you to present a clear comparison matrix and generate counter-offer drafts, making the procurement process much more efficient. One question I have is about the specific types of documents you anticipate suppliers will send—will they primarily use PDFs, or should we also consider other formats like Excel? Best regards, Ivan Mandinski

@Joya1996

What makes this MVP valuable is the time saved after suppliers reply, so the backend needs to be designed around ingestion, extraction accuracy, and quick review rather than just forms and login. I’d keep the build practical: supplier management, RFQ dispatch, inbound email capture, attachment storage, structured quote parsing, then a clean comparison view with editable counter-offer drafts. I’ve handled projects involving Supabase workflows, API integrations, AI-based data extraction, and business process automation where incoming data arrives in inconsistent formats. In your case, the biggest win will come from a solid normalization layer for price, currency, lead time, shipping terms, and payment terms before anything is shown in the matrix. I can also set this up so future additions like approval steps or supplier scoring are easier to add later. - Do you already have sample supplier quotes/reply formats we can use to shape the extraction schema? - Should the app store the original email thread and attachments for audit/reference? - Will users send the counter-offer from inside the app, or is draft generation enough for phase one?

@AnumFatima210

Hi, I went through your project details and understand what you're looking to achieve. I'd be interested in working with you on this. Based on the requirements you've shared, I can handle the project from start to completion while keeping the work aligned with your expectations, timeline, and desired outcome. My approach is straightforward: first, I'll make sure the requirements and expected deliverables are clear. Then I'll complete the work in structured stages, share progress along the way, incorporate your feedback, and deliver the final work after everything has been reviewed. Before we begin, I have a couple of questions about your requirements that will help me understand the scope more accurately. Feel free to message me so we can discuss the details and determine the best way to move forward. Best regards, Anum

@Hubready

Hello!, I am a Florida-based senior software engineer, and this kind of backend build is exactly where I can help most. For an email B2B web app, the main pain point is usually not just making it work, but making it reliable, scalable, and clean enough that the product does not become a maintenance mess later. I would approach it in practical phases: 1. Map the core email workflow, data model, and access rules 2. Build the backend/API in PHP/MySQL or Supabase, depending on what fits best 3. Add OpenAI or automation only where it saves real time 4. Test edge cases, permissions, and delivery flow carefully before launch I pay close attention to details other people miss, because that is often what breaks B2B apps down the road. If you want someone who reads the requirements carefully and builds with the final product in mind, I am a strong fit. A few relevant examples I have handled: - internal lead workflow dashboard for a sales team - AI-assisted support inbox for a SaaS tool - email automation backend for a niche service platform - reporting system tied to MySQL and API integrations Quick questions: 1. Is the main goal email sending, inbox management, or AI-assisted automation? 2. Do you already have the schema/API plan, or should I design that from scratch? 3. What are the must-have features for phase one? If you want, I can help define the fastest path to a stable MVP first, then expand from there. -James

@vladang

With 10-20 suppliers replying, the hard part is matching each reply and its PDF to the right RFQ. Each supplier gets a plus-addressed reply-to per RFQ, so Postmark's MailboxHash maps every reply without guessing from subject lines. PDFs and Excel files go to Supabase Storage, then GPT-4o Structured Outputs fills a schema with nullable fields. A missing lead time stays empty instead of invented, and the comparative matrix flags it for review. I spent four years at MacKenzie & MacKenzie Consulting building Python data pipelines and React apps on top. First milestone is RFQ dispatch plus parsed quotes in Supabase within 5 days, released only when it works. Should quotes in different currencies be converted before ranking, or compared as-is?

@naminghn

Hi there, I noticed that the project involves creating a procurement web application capable of managing supplier quotes and parsing incoming emails seamlessly. Using Supabase for user authentication and a CRUD interface is a solid approach for managing supplier contacts. I can implement personalized quote requests using Resend or Postmark, ensuring each supplier receives a tailored email. For the inbound parsing of suppliers' replies, I will leverage the OpenAI API to extract required data from PDFs and emails and update the database in real-time. I have extensive experience in developing back-end systems and integrating various APIs, which aligns well with your project needs. I look forward to discussing this in more detail to ensure we cover all your requirements. Regards, Ali

@denisSolution

Hi, I'm Denis, a full-stack developer who has built B2B automation systems with email workflows, AI extraction, and real-time data sync. This procurement app is exactly my wheelhouse—I understand the core challenge: reliably parsing variable supplier responses into clean, comparable data. The real complexity is the inbound email handling and extraction pipeline. You need to capture PDFs and email bodies, extract structured pricing using GPT-4o, handle parsing failures gracefully, and keep everything synced so the comparison matrix stays current. I'd start with the foundation: Supabase auth and supplier directory, then the RFQ form and email dispatcher using Resend or Postmark. Next, the inbound webhook listener and extraction pipeline, followed by the comparison matrix and counter-offer drafting. The trickiest part is reliable PDF parsing. Suppliers format quotes differently—tables, plain text, or scanned images. I'd use fallback logic: vision-based parsing for scanned PDFs first, then text extraction for native PDFs, with a human review flag for low-confidence extractions. This keeps accuracy high without blocking workflow. One realistic risk is email deliverability and webhook reliability. We'd need retry logic for failed sends, webhook validation, and monitoring to catch failures early. These aren't hard problems, but they're critical for production. I can start right away. Let's discuss the details. Thanks, Denis.

@sufyanasmat38

Hi, we can build the backend and AI automation for your B2B procurement MVP, including Supabase Auth/PostgreSQL, supplier and RFQ management, personalized email dispatch, inbound email webhooks, PDF/Excel quote parsing, and structured LLM extraction. We can use OpenAI Structured Outputs to reliably extract pricing, currency, lead time, shipping/Incoterms, and payment terms, then update Supabase in real time and generate editable counter-offer drafts. We’ll keep the architecture modular and API-driven so the comparison matrix and future procurement workflows can be extended easily. Could you confirm whether the $500 milestone covers the initial MVP/backend phase or the complete workflow through deployment?

@Hrolgar

I'd start by wiring the inbound email webhook so a supplier reply, PDF or Excel attached, runs through GPT-4o Structured Outputs and lands as a row in Supabase before any of the comparison UI gets touched. That's the part with the real unknowns, since attachment parsing quality swings a lot between a scanned PDF quote and a clean Excel sheet, and pulling price, currency, lead time, Incoterms and payment terms out reliably is the piece the rest of the app depends on. Once that pipeline holds up, the ranked matrix and the counter-offer drafts are mostly CRUD and prompt work on top of it. Supabase for auth and schema, Resend for the outbound RFQ sends and the inbound webhook that triggers parsing, and a normalized quotes table keyed to supplier and RFQ so the matrix can rank on any field without extra joins later. M1: inbound webhook plus GPT-4o parsing, quotes landing in Supabase, $215, 4 days. M2: ranked comparison matrix with editable fields and sorting by price, lead time and Incoterms, $220, 3 days. M3: AI counter-offer drafts and the RFQ send flow closing the loop, $215, 3 days. Do the 10-20 suppliers reply to one shared inbox or to per-manager addresses, and is Resend or Postmark already set up, or should that fall inside M1? And do the counter-offer drafts need to go back out through the same pipeline, or is a copy-paste draft enough for this MVP?

@topcreator100

Hi Mate , Good afternoon! I’ve carefully checked your requirements and really interested in this job. I’m full stack node.js developer working at large-scale apps as a lead developer with U.S. and European teams. I’m offering best quality and highest performance at lowest price. I can complete your project on time and your will experience great satisfaction with me. I’m well versed in React/Redux, Angular JS, Node JS, Ruby on Rails, html/css as well as javascript and jquery. I have rich experienced in Software Architecture, AI Automation, HTML, Supabase, OpenAI, MySQL, PHP and Backend Development. For more information about me, please refer to my portfolios. I’m ready to discuss your project and start immediately. "Draft Counter-offer" Looking forward to hearing you back and discussing all details.. Best Regards

@VianRey1

Managing supplier quotes by email gets messy fast. Important details hide in endless threads and attachments, making it a headache to compare offers or respond quickly. Chasing accurate data from PDFs or Excel files wastes valuable time, and missed info can cost you the best deal. You’ll get a backend that pulls supplier replies and attachments into clear, structured data, updates your dashboard in real time, and gives you a live comparison matrix with AI-generated counter-offer drafts ready for review. First, set up secure user access and a simple supplier directory. Then, build the campaign tool to send personalized quote requests and handle incoming emails and documents with AI-powered parsing. Finally, show all offers side by side and let you draft negotiation replies instantly. Would you like to discuss how you want the comparison matrix to rank top offers?

@technologiesit

With a proven track record of over 8 years and more than 200 successful projects under my belt, I wholeheartedly believe that I can be the perfect fit for your backend development project to create a robust B2B email procurement app. Be it web or app development, enabling AI automation or ensuring efficient software architecture – I specialize in all these aspects putting a particular emphasis on clean, secure and scalable code that is crucial for any B2B enterprise solution like yours. My extensive skills in Full Stack Development (using technologies like Laravel, React, PHP), AI Solutions & Automation (including Chatbots and Workflow Automation), API Development & Third-Party Integrations are directly aligned with the crux of your project needs. Additionally, my intimate understanding of AI-powered automation is well-suited for the parsing and extraction component envisaged in your project. Going forward, you can expect comprehensive solutions from my end as I build not just products but viable business solutions. What sets me apart is not just my technical prowess but also my acute business-first approach that will strive to understand your unique needs and deliver tailored solutions. Plus, you can count on my consistent support – both during and after project handover. Let’s schedule a conversation today and discuss how I can help drive your B2B email procurement project towards success!