MERN Full-Stack Technical Lead Needed

@irsolutions

I have over a decade of experience in web and mobile development, specializing in MERN full-stack projects like the one you’ve described. I understand the challenges you face with integrating your existing modules into a unified financial platform. In my previous projects, I successfully integrated AI/ML systems with UI dashboards, set up secure APIs for real-time data flow, and implemented robust security measures. My experience in fintech aligns perfectly with your requirements, having worked on payment gateways, fraud detection systems, and bank API connectors. I’m excited to take on the role of Lead Integrator for your project and ensure a seamless integration of your modules. Let’s connect and discuss how I can contribute to the success of your project. Looking forward to the opportunity to work together.

@Herculesz

Hi I can serve as the Lead Integrator to connect your React frontend, Python matching engine, and Node.js API gateway into a single secure, scalable fintech platform. I have experience integrating microservices, financial APIs, and real-time systems where security, reliability, and auditability are critical. The main technical challenge here is orchestrating real-time communication between the AI engine, API gateway, and UI while maintaining strong security, logging, and performance under load. I would approach this by formalizing service contracts, implementing secure REST and WebSocket communication, adding message queues for async processing, and introducing centralized logging and monitoring across services. I can also handle OAuth/JWT integration, encryption for PII, webhook verification, caching with Redis, and performance tuning to meet your response-time targets. I am comfortable working with Dockerized environments, CI/CD pipelines, and regulated fintech environments where audit trails and documentation are mandatory. And I can help you so on by turning the three existing modules into one production-ready, audit-ready platform with full documentation and deployment runbooks. Thanks, Hercules

@corpmember29

HELLO, WE HAVE WORKED ON SIMILAR FINTECH INTEGRATION SYSTEMS AND CAN PROVIDE EXAMPLES. I clearly understand your requirement for a Lead Integrator to unify your React frontend, Python AI engine, and Node.js API gateway into a secure, scalable financial platform. With 10+ years of experience across MERN, FastAPI, and fintech integrations (including payment systems, secure APIs, and banking connectors), I can efficiently orchestrate these modules into a cohesive system with real-time data flow, robust error handling, and production-grade architecture. I have hands-on experience with OAuth2/JWT security, RBAC, encrypted data handling, webhook integrations, and API orchestration, along with performance tuning using Redis, async queues, and optimized database design. I can ensure audit-ready implementation with proper logging, documentation, and deployment pipelines aligned with regulated environments. I WILL PROVIDE 2 YEAR FREE ONGOING SUPPORT AND COMPLETE SOURCE CODE, WE WILL WORK WITH AGILE METHODOLOGY AND WILL GIVE YOU ASSISTANCE FROM ZERO TO PUBLISHING ON STORES. Available to start immediately with strong communication and structured delivery. I eagerly await your positive response. Thanks.

@vishal1145

Your Python matching engine will fail in production if it's not wrapped in an async queue system. Processing 10K records per minute synchronously will create a bottleneck that locks up your Node.js gateway and leaves bank officers staring at loading screens. Before mapping the integration architecture, I need clarity on two things: What's your current database read/write ratio when the matching engine processes a batch? And does your Finacle integration support webhook callbacks, or are you polling their API on intervals? Here's the architectural approach: - FASTAPI + NODE.JS HANDSHAKING: Implement RabbitMQ between your Python brain and Node gateway to decouple processing. The matching engine publishes results to a queue, Node consumes them asynchronously, preventing cascade failures when AI processing spikes. - POSTGRESQL OPTIMIZATION: Index your PII tables on matching criteria fields and implement connection pooling to handle 10K concurrent queries without table locks. I'll add read replicas for bank officer dashboards to separate analytical load from transactional writes. - PAYMENT GATEWAY INTEGRATION: Set up HMAC signature verification for Africa's Talking webhooks with Redis-based idempotency checks to prevent duplicate SMS charges during network retries. I've built this exact flow for 2 fintech clients processing M-Pesa transactions. - DOCKER + KUBERNETES: Containerize all three modules with health checks and auto-scaling policies. Your matching engine needs horizontal pod autoscaling triggered at 70% CPU to handle batch processing spikes without manual intervention. - SECURITY HARDENING: Implement Vault for secrets management instead of environment variables. Your bank partners will audit this during compliance review - I've passed 4 PCI-DSS audits using this pattern. I've integrated siloed fintech modules for 3 clients that scaled from pilot to 50K daily transactions. I don't take on projects where the handshake points aren't clearly defined. Let's schedule a 20-minute technical call to walk through your current API contracts and identify integration gaps before we commit to timelines.

@samirsauma

Hi There , Good evening! I am professional mobile developer with skills including FastAPI, Docker, Kubernetes, Payment Gateway Integration, CI/CD, Node.js, Python, API Development, REST API and PostgreSQL. "system integrator" Please contact me to discuss more regarding this project. Thank you

@artakharutyun7

Hello, I’m applying for the Senior Full-Stack Integrator / Technical Lead role. My background is focused on integrating complex multi-service platforms built with React, Node.js, and Python, particularly systems where existing modules must be unified into a secure and scalable production architecture. I have strong experience working across the full stack: • React + TypeScript for complex dashboards and real-time UI systems • Node.js (Express / Nest-style architectures) for API gateways and service orchestration • Python (FastAPI) for ML-driven services and data-processing pipelines • PostgreSQL / MongoDB, Redis caching, and message queues for scalable backend systems • Docker-based deployments, CI/CD pipelines, and Linux infrastructure I regularly work on system orchestration problems, including connecting microservices, implementing API contracts, building retry logic, and ensuring consistent logging and monitoring across services. Relevant experience includes: The project you described—bringing together a React frontend, Python AI engine, and Node API gateway—matches the type of integration architecture work I enjoy most. I’m comfortable leading the integration process: mapping service communication, finalizing API handshakes, implementing secure data flows, optimizing performance, and producing the documentation required for audits and future developers. Best regards, Artak

@Mobilehead

Hello I once faced inconsistent payment schemas between services that caused lost transactions and I fixed it with a canonical event schema, idempotent handlers, and robust retry logic. I will connect your React frontend, Python matching engine, and Node API gateway into one secure, real-time platform. I will implement OAuth2/JWT auth, AES-256 for PII, TLS 1.3, HMAC webhook verification, and Africa's Talking SMS with fallbacks. I will add message queues, unified logging, Redis caching, error handling, and load testing to meet sub 500ms responses and 10,000 records per minute. I have direct fintech experience with payment gateways, bank connectors, reconciliation, audit ready documentation, and I can start ASAP at the hours and rate we agree.

@kareemmaize

Hi there To bring these “siloed modules into a unified, secure, and scalable financial platform,” the most critical part is orchestrating reliable communication between services without compromising security or performance. I’ll approach this by formalizing API contracts between the Node gateway and Python engine, then implementing async pipelines (queues + retries) to ensure stable real-time data flow across the system. This keeps the UI responsive while maintaining backend consistency. This means I understand how to handle secure integrations, webhook validation, and audit-ready architecture in regulated environments. My process is simple: Map system flows and integration points Implement API connections, queues, and security layers Optimize performance, test at scale, and finalize documentation I’m ready to begin with a full integration blueprint and API handshake validation, then move into staged system orchestration..

@abhisaini0188

Hello, As a seasoned Full Stack Developer with over 8 years of experience, I specialize in the exact areas you need for this project - AI-powered applications and machine learning integrations. Leveraging my expertise in Python and the proven ability to connect disparate systems, I am confident in being able to integrate your three siloed modules into a comprehensive and highly functional financial platform. Additionally, my solid understanding of technologies such as Node.js, React (TypeScript), Docker, Kubernetes, and Git among others along with my proficiency in databases like PostgreSQL will be invaluable for orchestrating system-wide communication. One of my key strengths is integrating AI/ML models, something that will come into play when connecting the 'Brain' to the 'Face' using secure RESTful APIs and implementing caching strategies for better performance. My extensive experience with payment gateways and reconciliation tools in regulated environments means I understand the gravity of what's at stake and will leave no stone unturned when it comes to security hardening or carrying out TLS 1.3 across all data transactions. I have the proven ability to deliver real business impact while optimizing for scalability - qualities that I believe would make me an ideal addition to your team. With Regards!

@Ekarthaan

Hi Ashu E., This is quite similar to a project I delivered last week, so I can jump straight into execution. Ready to start immediately. Two questions: For the Python matching engine ↔ Node gateway, should matching be synchronous on request paths or offloaded to a queue with the UI receiving results over the existing WebSocket? Which UI views must meet the <500ms SLA end-to-end, and which workflows can be eventual-consistency? What’s the key management baseline for AES-256 and HMAC/JWT secrets (KMS/Vault/HSM), and do bank/telco webhooks provide IP allowlists and idempotency requirements we must enforce? Two suggestions: Introduce a message bus (Kafka/RabbitMQ) with the outbox pattern and idempotency keys to decouple UI/API from the ML engine, add retries/DLQ, and guarantee at-least-once delivery. Implement unified observability: OpenTelemetry traces across React, Node, and FastAPI; structured JSON logs to ELK/OpenSearch; Prometheus/Grafana SLOs; plus tamper-evident audit logs. Action Plan: - Phase 1: Architecture read-in, envs, security baseline, API contracts and event schemas. - Phase 2: Messaging layer + outbox; idempotency; DLQ; unified error model. - Phase 3: AuthN/Z hardening (OAuth2/JWT, RBAC), TLS 1.3, PII encryption with KMS/Vault. - Phase 4: Real-time UI wiring (WebSocket), caching (Redis), hot paths optimized Best Regards, Sid

@salesapple

Hi, I’m a Senior Full-Stack Engineer with 8+ years of experience, including fintech integrations and secure system architecture. I’ve led end-to-end builds connecting React (TypeScript), Node.js APIs, and Python (FastAPI/ML services) into scalable, production-ready platforms. I’ve previously integrated payment gateways, bank APIs, webhook systems, and fraud detection flows, ensuring secure (OAuth2/JWT, AES-256), real-time, and audit-ready systems. I’m highly experienced in system orchestration, API handshaking, microservices, and performance tuning (Redis, queues, <500ms latency targets). I can take full ownership as a Lead Integrator, unifying your modules into a secure, scalable financial platform with clean architecture and complete documentation. Availability: Immediate Commitment: Full-time (40 hrs/week) Let’s connect—I’m ready to start and deliver fast. Best regards,

@KarthikTechCon

Hi, I’m Karthik with 15+ years of experience as a Full-Stack Architect and Fintech Integrator. I specialize in connecting complex, pre-built systems into secure, scalable platforms—exactly what your project requires. Why I’m a strong fit: • Deep expertise in React (TS), Node.js, Python (FastAPI) • Proven fintech experience: payment gateways, bank APIs, fraud systems, reconciliation engines • Strong background in system orchestration, API integrations, and regulated environments How I’ll execute your mission: • System Orchestration: Connect AI engine → Node gateway → React UI with real-time flow (WebSockets/queues), retry logic, unified logging • API Handshaking: Implement secure telco/bank integrations, webhooks, HMAC validation, SMS gateway, and failover handling • Security: OAuth2/JWT, AES-256 encryption, RBAC, audit logs, TLS 1.3—ready for audits • Performance: Redis caching, async processing, DB/query optimization, <500ms response targets, load testing • Documentation: Master architecture, API specs, runbooks, audit-ready documentation Relevant Experience: Led integrations across banking APIs, mobile money (M-Pesa-like), fraud detection systems, and high-scale microservices platforms. Availability: Immediate | 40+ hrs/week Engagement: Long-term (3–12 months) Rate: Flexible based on scope I enjoy solving integration challenges and making systems work seamlessly. Warm Regards, Karthik B Resonite Technologies

@vladang

You already have strong modules—your main risk is integration failure under real-time load and audit constraints, especially syncing the Python “Brain” with the React “Face” through a secure, resilient gateway. That’s exactly where I specialize. I would formalize this into an event-driven architecture: Node.js (NestJS) as the orchestration layer, Redis + message queues (BullMQ/Kafka) for async matching workflows, and strict API contracts between FastAPI and the gateway. I’ll enforce idempotent webhook handling, HMAC verification, and centralized logging (ELK-style) for audit readiness. For performance, I’ll introduce response caching and streaming updates via WebSockets to reliably hit <500ms. Improvement: add a reconciliation layer to validate matching + payment states—critical for fintech audits. Recently, I integrated a payment + fraud detection pipeline (Node.js, FastAPI, PostgreSQL) handling 12k+ events/min with full audit logging and RBAC, and led a multi-service frontend/backend integration (Vue/Nuxt + Node) with real-time dashboards. Q1: What message broker (if any) is currently preferred for async processing? Q2: Are bank/telco APIs sandboxed or already live with rate limits defined? Q3: How is PII encryption currently implemented at the database level (field-level or full-disk)?

@royalwebraisers

Hi, As per my understanding, you need a Senior Full‑Stack Integrator to connect three existing modules—React/TypeScript frontend, Python AI matching engine, and Node.js API gateway—into a unified, secure financial platform with real‑time data flow, robust security, and audit‑ready documentation. Implementation approach: - Orchestrate services via REST/WebSocket, with queues (RabbitMQ/Kafka) for async jobs and unified logging. - Tighten the API layer with OAuth 2.0, JWT, RBAC, encrypted PII, and secure webhook handling for banks and Telco. - Tune performance with Redis caching, optimized DB queries, and load‑tested pipelines for high‑volume throughput. Quick queries: 1) Are there any specific compliance or audit standards you must follow (e.g., local banking rules, PCI‑DSS)? 2) What is your preferred staging environment setup (Kubernetes vs basic Docker)? I will share my portfolio on your first message. Kindest Regards

@douglasfullstack

I can handle your integration project as a Senior Full-Stack Technical Lead. You want to transform independent modules into a seamlessly unified financial platform, ensuring secure, real-time data flow and scalability. I'll integrate your React/TypeScript frontend with the Python-based AI/ML matching engine and the Node.js API Gateway, leveraging RESTful APIs and secure data orchestration. My approach includes using Docker and Kubernetes for containerization and orchestration, PostgreSQL for reliable data management, and robust payment gateway integration for financial transactions. I will ensure clean, maintainable code and a scalable architecture that supports future growth. Should I prepare a technical integration outline to kick off the project planning phase?

@chiragardeshna

Hi there, Strong alignment with this project comes from leading full-stack integrations where multiple systems must work together securely and at scale . Clear understanding of connecting React, Node.js, and Python modules into a unified fintech platform with real-time data flow, API orchestration, and secure communication. Hands-on expertise with microservices, API gateways, authentication (OAuth/JWT), and system optimization ensures reliable, production-ready integration. Risk is minimized through structured orchestration, logging, testing, and aligning all components with audit and compliance requirements. Available to start immediately happy to discuss integration approach and timeline. Recent work: https://www.freelancer.com/u/chiragardeshna Regards Chirag

@mugencodes

Hello, I have carefully reviewed the project description and fully understand the task at hand. The goal is to integrate three existing high-fidelity modules - a React/TypeScript frontend, a Python-based AI/ML matching engine, and a Node.js API gateway - into a unified, secure, and scalable financial platform. I have prior experience developing a similar project involving Python, Node.js, API Development, CI/CD, Docker, FastAPI, and PostgreSQL. In that project, I encountered a similar challenge of integrating siloed modules into a cohesive system. By implementing robust RESTful APIs, real-time data flow mechanisms, proper error handling, and security protocols, I successfully unified the disparate components into a seamless platform. I would love to discuss this project further with you over a call to explore how I can contribute to your team as the Lead Integrator. Regards, Jayabrata Bhaduri

@mughiraaa

hi, i have reviewed the details of your project. i have strong experience integrating fintech systems across react, node, and python stacks. i can connect your frontend, api gateway, and ai engine into one secure and scalable system with real-time data flow, proper api handling, and unified logging. i have worked on payment integrations, oauth, jwt security, and webhook systems, so i understand audit and compliance needs. i am available to start immediately and can commit full time to meet your timeline. let's have a detailed discussion, as it will help me give you a complete plan, including a timeline and estimated budget. i will share my portfolio in the chat. best regards. mughiraa

@alohomorasol

With over a decade of full-stack development experience, I believe I have the necessary skills and expertise to tackle what this project demands. Throughout my career, I have specialized in executing end-to-end projects from planning, building, and deploying, just as you require for this position. My proficiency in API development paired with advanced knowledge in Node.js and PostgreSQL will ensure efficient communication between your silo-ed modules and the creation of secure, real-time data flows that you need for this platform.