Team Required — SQL Backend, Payments and Real-Time Sessions — Fixed Price in CAD

@corpmember29

Hello, SQL BACKEND + PAYMENTS + REAL-TIME SESSION SYSTEM {{{ I HAVE CREATED SIMILAR BEFORE AND I CAN SHOW YOU }}} I understand you need the existing SQL schema, backend integrations, payment processing, access entitlements, and real-time session flow completed, integrated, and fully tested with strong protection against duplicate transactions, concurrent redemption, interrupted payments, and reconnection issues. I can finalize the SQL schema, migrations, constraints, transactions, retries and rollback, secure complimentary-code generation/redemption, account and entitlement recovery, hosted payment checkout, signed payment webhooks, reconciliation and background processing. I can also connect entitlements to the existing real-time sessions with fair waiting/queue handling, duplicate-reservation prevention, session consumption only after activation, reconnection recovery, and resource cleanup. I will cover production security, rate limiting, TLS, monitoring, deployment, backups/restoration, documentation, and comprehensive failure/concurrency testing while ensuring conversation content is not stored in SQL, logs, or backups. I have 11+ years of experience in SQL, backend development, payment integrations, real-time systems, authentication, transactions, webhooks, recovery workflows, and production deployments. I CONFIRM DELIVERY BEFORE 7:00 P.M. QUEBEC TIME ON SEPTEMBER 23, 2026. I WILL PROVIDE 2 YEAR FREE ONGOING SUPPORT AND COMPLETE SOURCE CODE. Thanks, Christina

@denisSolution

Hi, I'm Denis, a backend and real-time systems developer who has built SQL-backed systems with payment flows, access control, and concurrency handling. This project needs a reliable backend that coordinates session entitlements, payments, and real-time state without ever double-consuming credits. I’ll extend the provided schema with strict transaction control, idempotent payment handling, and background reconciliation for out-of-order or lost notifications. The existing real-time relay will be connected to the new backend using signed session tokens so reconnection never wastes a session. Complimentary code generation will include rate-limited batch export with cryptographic validation and immediate deactivation after redemption. I’ve recently worked on a similar system where payment confirmations, queue management, and recovery logic had to remain consistent under load. The deliverables will be the completed schema, migrations, and integration code, plus documentation and one-click deployment scripts. The main risks are unclear third-party rate limits and edge cases in background job retries; these will be handled with idempotency keys and manual override hooks. All testing will cover duplicates, network failures, and recovery. I can start working right away. Let's connect and discuss the details. Thanks, Denis.

@Tanmoy236

Hi There! I specialize in backend, SQL, payment and real-time systems with 9+ years of experience. Our team can complete the existing backend integration with strong focus on transaction safety, duplicate prevention, entitlement recovery and reliable session consumption. We’ll finalize the SQL/migrations, payment webhooks, complimentary codes, authentication, queues, retries, reconciliation, real-time session integration and production security, then test failure/concurrency scenarios end-to-end. We explicitly confirm delivery by 7:00 p.m. Quebec time on September 23, 2026. Can you share the existing code and technical documentation for review?

@Eliteinno

Hello, Is your current SQL schema compatible with the existing real-time state management? Do you have a preferred payment provider already selected? Excited about your avatar service! I'll ensure seamless integration and focus on robust entitlement management to prevent duplicate session issues. Let's discuss the timeline and costs in more detail after reviewing your full requirements together. Looking forward to a chat to explore further steps. Feel free to message me anytime!

@ammarahmed20

With a proven track record of building complex backend systems, I am confident that I can successfully manage and deliver your project on time and efficiently. From my previous projects such as Tritaur, Quantum Trading Mastery, Social Slots, and Bizzall Finance, I have demonstrated my capacity to create dynamic web applications and platforms with robust APIs. My wealth of knowledge extends to payment gateways integration and management, ensuring the secure handling of payments up to $100K monthly - an excellent match for your detailed project requirements. Furthermore, my experience in real-time web application development will be a tremendous benefit to your project as it heavily requires dealing with concurrent requests and managing session data. As an avid gamer myself, I understand the importance of interactivity and reliable service in a virtual world. This passion transcends into my work approach where I prioritize uninterrupted user sessions, efficient allocation of resources even during high demands, and safe recovery mechanisms if any interruptions occur.

@chiragpipal

⚠️ If you're not happy, you don’t pay. ⚠️ Hi, Thank you for checking my proposal and sharing the detailed project brief. I can build your interactive avatar service backend using SQL, Node.js, and real-time technologies with a secure and scalable design. I will deliver: • A robust SQL database architecture with effective transactional handling • Secure batch generation and validation for complimentary access codes • Complete payment integration with reliable recovery processes • Real-time session management with proper reconnection handling • Comprehensive documentation and deployment instructions You will also receive: • Post-launch support for initial operations • Code quality review and optimization guide I am confident I can execute your vision professionally and efficiently. Looking forward to discussing the timeline and next steps. Best regards, Chirag Pipal

@giaphung2k1

Hello I specialize in building secure, high-performance backends for subscription-based services. I will architect your SQL infrastructure with robust access control, integrate seamless payment processing via Stripe, and implement low-latency real-time session management to ensure a smooth user experience. With extensive experience in Node.js and PostgreSQL, I deliver clean, scalable code tailored to your exact requirements. Could you share the specific technology stack or hosting preference you have in mind for this interactive avatar service? Best regards, Giáp Văn Hưng

@starttechno

I will complete the SQL-backed entitlement and session layer around your existing flow: isolated dev/test databases, production migration/permission plan, transactional redemption and purchase issuance, and idempotency so concurrent requests, retries, or duplicate payment notifications cannot consume or grant an entitlement twice. I will integrate hosted checkout and signed server-side notifications, then add durable reconciliation/background jobs for delayed events, recovery after interruption, and a manual-review trail. Session consumption will begin only after active confirmation; reconnects will retain the same reservation/timer. I will also connect fair waiting/allocation, cleanup, monitoring, rate limits and TLS/WAF routing without logging conversation content. Relevant production work includes ClearAgent, a multi-tenant SaaS operating a live clearing workflow end-to-end, and DeskLeap, a published Shopify support platform with a public REST API. I also fixed frozen live trading charts by adding caching, provider-credit controls, and last-good-state recovery. I can provide verifiable Freelancer work-history references, including completed activity from July/August 2026, during shortlisting. Muhammad Saad

@lazarr4

Hi, For a recent project I built a real-time ticketing system with PostgreSQL, Stripe payments, and WebSocket sessions. The team handled 10k concurrent connections without double-charging or lost entitlements. The core is making sure a paid session or free code can’t be reused, even if the connection drops or the browser reloads. I’d use PostgreSQL’s advisory locks for concurrency, Stripe webhooks with idempotency keys, and a single background worker for reconciliation. Every payment confirmation produces exactly one entitlement, and recovery from failures is automatic. The service stays reliable under load and avoids duplicated sessions or charges. Changes will be small, tested in isolation, and rolled out gradually to avoid downtime. The scope stays locked to the agreed specs unless we add and price it separately. Let’s move forward with the fixed price and milestones we discussed. Thanks, Lazar

@PrateekP3003

With over a decade of experience, my expertise aligns perfectly with the requirements of your project. I have a comprehensive understanding of SQL database and backend development, honed over years of building AI systems that actually work in production. My proficiency includes executing complex schema, securing data access components, handling concurrent transactions, and managing retries and rollbacks gracefully – all skills crucial to the success of your project. Moreover, I have extensive experience in managing authentication, session entitlements, and integrating payment gateways. This enables me to confidently pick up your existing work on avatar service without losing any valuable momentum. As a professional who’s consistently delivered working systems ahead of strict deadlines, I can assure you that your project will be live and functioning seamlessly by September 23rd. Lastly, my focus on deployment and post-delivery support would ensure that once the system is implemented, it remains robust and efficient in real-time conditions. My track record in providing ongoing support has earned me long-term client partnerships because even after delivery, real-life usage often requires fine-tuning for optimal performance – something I fully understand. Let's connect so we can fully explore the potential synergies between us!

@ahmaddar2970

Confirmed: we can deliver the complete integrated system before 7:00 p.m., Quebec time, on Wednesday, September 23, 2026. We’ll take a disciplined build-and-verify approach across SQL, backend integrations, payments, entitlement recovery, queueing, and production hardening. The focus will be on preserving your existing work, finalizing the schema and migrations, preventing duplicate entitlement consumption, and ensuring payment and recovery flows remain correct under retries, delays, and restarts. Delivery will include the source code, SQL scripts, schema, deployment notes, backup/restore and rollback procedures, plus a full test pass covering duplicate notifications, concurrent redemption, interrupted processing, queue recovery, reconnection, and session lifecycle handling. We can work with your shared documentation and codebase, align to the agreed scope, and keep any additions strictly approval-based before implementation. Best regards.

@FizzaNadeemK

Hi, I can handle the SQL/backend, payment integration, entitlement management, concurrency protection, retries, and real-time session integration with a strong focus on preventing duplicate consumption and payment issues. Fixed price: CAD $1,450 milestones: 30% database/backend, 30% payments + entitlements, 25% sessions/recovery, 15% testing/documentation. I confirm delivery before 7:00 p.m. Quebec time on September 23, 2026. I’m comfortable using Codex/Claude where useful, but I personally review and test the implementation. I can provide relevant SQL/payment/realtime examples and recent project references during the shortlist stage.

@milanrathod945

Session entitlements collapse under concurrent access without proper isolation, row-level security and transaction handling prevent duplicate redemptions, and I've shipped this pattern at scale. - I can finalize the SQL schema with proper isolation, constraints, and retry logic for concurrent access. - Payment integration will handle duplicate notifications, delayed confirmations, and automatic entitlement recovery. - On Day 1 I can implement the complimentary code redemption flow so you can test it immediately. Can you share the existing SQL schema and payment provider details so I can start today?

@razmiks2

Hi, I’ve worked on similar SQL-backed entitlement and payment flows where duplicate notifications, retries, and reconnection must never double-consume access. For this interactive avatar service, I’ll complete the isolated dev/test databases, finalize schema/migrations, and implement concurrency-safe transactions in SQL so entitlements are issued and consumed exactly once. On the backend side, I’ll integrate the payment provider with hosted checkout, server-side confirmation, and signed notifications handling out-of-order events. Then I’ll connect entitlements to the existing real-time sessions with waiting/queue logic that prevents duplicate reservations and supports automatic recovery after interruption. I will explicitly confirm delivery before 7:00 p.m., Quebec time, Wednesday, September 23, 2026. Best, Razmik

@SidUSA

Hi, We are available to take this on and get your interactive avatar service working perfectly. The main issue with partially built backends is usually the payment notification webhooks or session concurrency rules not lining up for real-time states specifically. Are you planning to use robust idempotency keys for payment validation and do you want the entitlement verification handled as an atomic database transaction or background queue? We recently built a similar backend for a real-time platform that needed custom payment processing and concurrent session management injected into their SQL schema. I used the backend API to hook into the transaction event and built a secure verification layer that validated payments before using safe rollback methods to update the user entitlements. I corrected their database constraints to ensure data integrity across multi-client requests. Our fix stopped user sessions from being lost during disconnects and made the whole authentication process way faster for their team. We confirm delivery before 7:00 p.m., Quebec time, on Wednesday, September 23, 2026. We are eager to discuss the project further. Reach out to initiate a conversation! Best regards, Quantum Code Solutions

@christech1117

Here's the proposal: --- You need the SQL layer and payments wired into an existing avatar session flow — isolated dev/test DB, production-ready deploy scripts, complimentary access codes, and paid fixed-duration sessions (that CAD $0.99/10-min offering with configurable price and duration). I'd execute your prepared schema, build the data-access layer and payment integration with idempotent webhooks so a session only unlocks on confirmed payment, then connect your existing real-time state/reconnection handling to the backend and validate against your automated tests plus new integration coverage for the code-redemption and paid-session paths. I ship end to end and I'm comfortable assessing and reusing what's already there rather than rewriting it. One question that shapes the whole build: which payment provider are you standardizing on — Stripe, or something specific to CAD processing — since that dictates the webhook and access-unlock design? --- That's 133 words.

@cuyodigital

:) Hello, I'm Ricardo from Buenos Aires. :) What you have isn't only a backend task, it's a transaction reliability problem. When payments, entitlements, sessions, and recovery flows are not perfectly connected, users can lose access or consume resources incorrectly. I will review the existing schema and code first, then complete SQL structure, backend APIs, payment confirmation, entitlement logic, session handling, retries, and testing flows with security in mind. Straight answer - if you need a quick patch without checking edge cases, I'm the wrong person. If you need a stable backend integration, I can help. Which backend technology is already used for the current session system? I'll review the existing structure and suggest the safest integration approach before you decide anything. Free, no commitment. If you want, I can share some examples of my previous projects here on Freelancer.com, so you can evaluate my skills and experience.

@novatech2210

I’m ready to take on the full backend build for your interactive avatar service. **Fixed‑price proposal**: CAD $1,440.00, which covers the SQL schema, payment integration, entitlement logic, real‑time session handling, security hardening, testing and documentation. **Milestones**: 1. 50 % (CAD $720) upon receipt of project details and signing of a brief scope agreement. 2. 25 % (CAD $360) after completion of the database deployment, migration scripts, and backend core APIs. 3. 25 % (CAD $360) upon final delivery, including live demo, full test suite, and deployment package. **Deadline confirmation**: I guarantee the complete system will be delivered, fully tested, and ready to go live before 7:00 p.m. Quebec time on Wednesday, September 23, 2026. **Experience**: I’ve delivered two payment‑enabled, real‑time session services in July 2026 and August 2026, both under similar fixed‑price contracts. My team has built secure code‑generation modules and implemented reliable payment‑notification handling with idempotent entitlements. I look forward to collaborating closely with your team, ensuring a seamless, secure, and scalable solution that meets all your specifications.

@panos1414

Hi Mate , Good afternoon! I am professional mobile programmer with skills including SQL, API Development, Backend Development, Database Management and Payment Processing. Please contact me to discuss more regarding this project. Please keep me informed