Need a production backend with real auth, roles, and multi-tenant data isolation, not just a CRUD API? I build and harden FastAPI + Next.js systems for teams past the prototype stage: authentication (JWT/OAuth/MFA), role-based access control, per-tenant data boundaries, rate limiting, and audit logging that holds up to a client or compliance review. I also build the AI layer when a product actually needs it, RAG/chat with cited answers, not a bolted-on widget. Recent: $2.5k FastAPI + React MVP delivered end-to-end (5.0 rating). What you get in Phase 1 (~1 week): ▪ Scoped working milestone: core API, database schema, auth + role/tenant model, admin shell ▪ Fixed-price milestone before full build, no open-ended hourly drift ▪ Clean handover: docs, repo structure, deployment + environment notes Stack: Python (FastAPI), Next.js/React, PostgreSQL, Redis, Docker, AWS; OAuth/JWT, RBAC, multi-tenant architecture; OpenAI/Claude, LangChain, pgvector/Pinecone when RAG is in scope. How I work: quick scope call or async brief, Phase 1 milestone in ~1 week, iterate, production-ready handover with docs. Share your repo, spec, or current architecture and what you need secured or built, I'll reply with a clear plan and a fixed-price Phase 1 offer.

Backend engineer building production fintech systems live payments, multi-tenant SaaS, API integrations that run 24/7. Currently leading backend on a BNPL platform: FastAPI + PostgreSQL + Redis, processing MTN MoMo payments, Angaza device sync, credit scoring webhooks, React admin dashboard. 300+ tests, Docker/CI/CD, deployed on AWS. What I build: - FastAPI backends with async architecture - Payment integrations (MTN MoMo, PayFast, Stripe) - Multi-tenant SaaS with RBAC and audit logging - Background processing pipelines with retry logic - Docker, AWS deployments, CI/CD infrastructure - React + TypeScript dashboards Stack: Python, FastAPI, PostgreSQL, SQLAlchemy, Redis, Docker, AWS, React, TypeScript I own problems end-to-end - from architecture to deployment. Code that doesn't break at 3 AM. Keywords: FastAPI developer, payment gateway integration, Stripe integration, MTN MoMo integration, webhook handler, idempotent API design, REST API developer, PostgreSQL backend, multi-tenant SaaS, RBAC, background job processing, Docker deployment, AWS EC2, CI/CD, fintech backend engineer, credit scoring API integration, KYC integration, audit logging

I work on building AI features using OpenAI, LLMs, and Python (FastAPI) for products that need reliable chatbots, automation, or intelligent workflows. That’s been my focus for the past 5 years. I’ve worked across Python, Node.js, and React, with most of my recent work centered around LLM-based applications, prompt engineering, and backend systems that support AI-driven features in production. I’ve worked on an AI diagnostic platform where I processed large datasets and built backend pipelines to generate consistent, structured outputs that could be reliably used within the product. This involved designing APIs, handling continuous data flow, and ensuring the system stayed stable under real usage. I’ve also contributed to a full-scale AI web application where OpenAI integration and prompt design were key to producing consistent, context-aware responses. I’ve mostly worked on projects where AI is part of a larger product, not a standalone feature, so integration and system design have been a big part of my work. A big part of my work involves building chatbots and AI assistants that go beyond basic Q&A, where handling context, response consistency, and real-time usage actually matter. On the backend side, I’ve built systems using FastAPI, Node.js, PostgreSQL, and REST APIs, managing integrations and keeping the system clean and scalable. Technically, I work with Python, FastAPI, TypeScript, OpenAI API, PostgreSQL, Docker, and AWS, and use React / Next.js when a frontend layer is needed. I try to keep things practical, build what actually solves the problem, avoid overcomplicating things, and make sure it performs well in real-world conditions. If you're working on something involving AI or planning to integrate it into your product, feel free to reach out. I’m happy to take a look and suggest the most practical way to approach it based on your use case.

FastAPI backend engineer and AI agent builder with 5+ years of production experience: Python, n8n, LangChain, RAG, and LLM-powered automation systems that actually ship, not prototypes that break under real use. Recent production work: MarbleBee: AI voice agent platform for a wholesale/DTC business. Twilio for calls, OpenAI for reasoning, RAG-based knowledge retrieval, and ~20 interconnected n8n workflows handling everything from lead classification to Shopify/Etsy product sync and Pinterest publishing. AskVideo: AI video Q&A platform. FastAPI backend, ChromaDB vector search, LangChain orchestration. Users ask questions about video content and get answers with source citations, not guesses. Chatpaper: document Q&A system with hybrid retrieval (dense + BM25 + reciprocal rank fusion), multi-format file support (PDF, Word, Excel), and citation tracking back to source. ALE: enterprise healthcare operations platform. Multi-tenant SaaS, JWT auth, RBAC across three role tiers, RabbitMQ-driven async workers, 35+ REST endpoints, deployed on AWS with CI/CD. What I build: Agentic AI Systems - AI agents with tool-calling, memory, and multi-step reasoning (LangChain, LangGraph) - RAG pipelines with hybrid search (ChromaDB, Pinecone) - Voice and conversational AI with real-time processing Backend & Automation - FastAPI/Django backends: REST APIs, JWT auth, RBAC, async task processing (Celery, RabbitMQ) - n8n workflow automation: webhook-driven integrations, CRM/lead pipelines, third-party API connectors - PostgreSQL/Supabase data models, Docker deployment, AWS infrastructure Core stack: Python · FastAPI · LangChain · LangGraph · OpenAI · Anthropic Claude · n8n · PostgreSQL · Redis · ChromaDB · Docker · AWS · Supabase · Celery · RabbitMQ Anthropic-certified (Claude API, prompt engineering): most AI freelancers on here are OpenAI-only. Also searched as: FastAPI developer, LangChain engineer, LangGraph developer, AI agent developer, n8n developer, RAG developer, agentic AI engineer, Python automation engineer, OpenAI integration developer, AI workflow automation engineer, backend API developer, LLM application developer, Python backend engineer, multi-agent system developer, n8n automation specialist, LangChain RAG developer, FastAPI backend developer, AI agent builder.

Top rated full-stack Python developer here to help build your SaaS products efficiently and within deadlines. I have over 4+ years of experience working with individuals and companies looking to build products using the latest technologies and frameworks, such as Python, FastAPI, Flask, REST API, AWS, Django and NextJS. I have worked on more than 7 different products; in 5 of them I purely worked as a backend engineer, and a couple of them were long-term work. I regularly work on Python scripting for automation for my own work and to help out building utilities for companies as a freelancer. I have also worked on amazon web services extensively in past couple of years and recently I have worked in LLMs (OpenAI GPT, Claude, Gemeni) Integration in existing code, also I have recently worked in RAG (Retrieval Augmented Generation). My core expertise is as below: - Back-end programming - Scripting and Automation - Languages: Python, JavaScript, Golang - Frameworks: Django, FastAPI, REST API, Flask, React - Cloud: Amazon web services (AWS), Google cloud platform - AWS services: EC2, RDS, S3, IAM, CloudWatch - AI: LLMs (OpenAI GPT, Claude, Gemeni), LangChain, RAG, LangGraph - Scraping tools: BeautifulSoup, Scrapy, Selenium, Proxies - Backend programming - Shell scripting - Serverless programming using AWS lambda, DynamoDB and EventBridge - Automation scripting and data pipelines I am looking for Medium to long term projects and looking to work in products that pushes me to work more and demand more from my knowledge, and also I would like to work in LLMs Integrations where I can more work on OpenAI, Claude type LLMs Integrations. Happy to hop on a call to discuss further!

I help startups and businesses build modern websites, SaaS platforms, dashboards, and cross-platform mobile applications that are fast, scalable, and easy to maintain. Whether you're launching a new product, improving an existing application, or adding new features, I focus on building reliable software that delivers a great user experience while remaining simple to scale and maintain. I can help with: ◈ Custom web application development ◈ Cross-platform mobile app development with React Native ◈ React, Next.js, JavaScript, and TypeScript ◈ Python and FastAPI backend development ◈ REST APIs and third-party API integrations ◈ AI integration using OpenAI, Anthropic, Gemini, LangChain, and RAG ◈ Stripe payments, subscriptions, Checkout, Customer Portal, and webhooks ◈ PostgreSQL, MySQL, MongoDB, Redis, and Supabase ◈ Authentication, user management, and role-based access ◈ Admin dashboards and customer portals ◈ Workflow automation and business process automation ◈ Docker, AWS, DigitalOcean, deployment, and performance optimization Recent projects have included SaaS platforms, business websites, customer portals, AI-powered applications, mobile apps, payment systems, and backend platforms connecting multiple third-party services. I write clean, maintainable code, communicate clearly throughout the project, and build solutions that are practical for long-term growth rather than quick fixes. Whether you need a business website, a custom web application, a React Native mobile app, AI-powered functionality, payment integration, or a complete full stack solution, I'd be happy to discuss the best approach for your project.

I build production-grade backend systems and AI-driven automation tools — from GoHighLevel marketplace apps to AI agents that take real actions across Slack, HubSpot, and Gmail. Over the past several years, I've delivered systems that go beyond CRUD APIs: async architectures, OAuth-secured integrations, and AI agents that don't just chat — they execute (creating CRM deals, triggering workflows, running background jobs) with human-in-the-loop oversight for sensitive actions. ✔️ Backend: Python, Django, Django REST Framework, FastAPI, Flask, PostgreSQL, Redis, Celery, async task queues ✔️ Frontend: React.js, Next.js, TypeScript, Redux Toolkit, HTML5/CSS3 ✔️ Cloud & DevOps: Docker, Kubernetes (GKE), AWS, Google Cloud Platform, CI/CD (GitHub Actions), Prometheus monitoring ✔️ Automation & Integrations: GoHighLevel (GHL) app development, n8n, OAuth flows (HubSpot, Slack, Google), webhooks, Stripe 🏆 Highlighted Work ✔️ GoHighLevel Marketplace App Built a custom GHL app installable directly from the GHL App Store — in-app onboarding, secure payment credential collection (Stripe), and a fully white-labeled booking application deployable to each customer's own GHL domain with custom branding. ✔️ AI-Powered Support Agent (FastAPI) Built and maintained a FastAPI backend for an AI agent handling live conversations across Slack, Gmail, and web chat — with async webhook processing, OAuth token handling, and AI-driven actions (e.g., auto-creating HubSpot deals) run as non-blocking background tasks. Added WebSocket-based human-in-the-loop review so sensitive actions get a timed admin check before executing. ✔️ B2B Lead Data Platform Django-powered platform structuring verified B2B lead and technographic data for sales/marketing teams — RBAC, bulk CSV import, Stripe monetization, async processing via Celery, deployed on GKE with GitHub Actions CI/CD. 🎯 What I Can Help You Build - GoHighLevel apps, funnels, and white-labeled sub-account tools - AI agents/chatbots that take real actions, not just answer questions - FastAPI/Django backends with async processing and third-party integrations - Kubernetes/Docker deployments on GCP or AWS - n8n and webhook-based automation between your existing tools I focus on clean architecture and systems that keep running with minimal oversight — not just shipped features. If you need someone who can own the backend, wire up AI automation, and deploy it reliably, let's talk. Keywords: Python Developer, Django Developer, FastAPI Developer, GoHighLevel Developer, GHL App Development, AI Agent Developer, AI Automation, Chatbot Development, Kubernetes, Docker, AWS, Google Cloud Platform, React, Next.js, REST API, OAuth Integration, Webhook Automation, n8n, Celery, PostgreSQL, Redis

🔥 AI Engineer & Full-Stack Developer with 5+ Years of Building High-Impact Digital Products 🚀 Expert in Claude Code, Python, OpenAI, AI Agents, LLMs, FastAPI, React & Next.js ⚡ Specialized in AI SaaS, Intelligent Automation, Custom Web Applications & API Development 🤝 Partnering with Startups, Founders & Enterprises to Build Scalable, Future-Ready Solutions I help startups and businesses build AI-powered products, intelligent automations, and scalable web applications that solve real business problems. Whether you're launching an AI SaaS, integrating GPT or Claude into your product, building AI agents, automating workflows, or developing a modern web application, I deliver production-ready solutions that are scalable, secure, and built for long-term growth. My expertise combines Artificial Intelligence with Full-Stack Engineering, allowing me to develop complete products from backend architecture to intuitive user interfaces. AI Development Services ✅ AI Agent Development ✅ Claude Code Development ✅ OpenAI GPT Integration ✅ LLM Applications ✅ AI Chatbots ✅ RAG Systems ✅ Multi-Agent Workflows ✅ Prompt Engineering ✅ AI Workflow Automation ✅ MCP Server Development ✅ Vector Database Integration ✅ LangChain & LangGraph Development ✅ AI Document Processing ✅ AI Business Automation ✅ AI APIs & Custom AI Solutions Full Stack Development ✅ React.js ✅ Next.js ✅ TypeScript ✅ JavaScript ✅ Node.js ✅ Express.js ✅ NestJS ✅ Python ✅ FastAPI ✅ REST APIs ✅ GraphQL ✅ WebSockets ✅ Authentication (JWT, OAuth) ✅ Role-Based Access Control ✅ Dashboard Development ✅ SaaS Platforms ✅ Admin Panels ✅ Enterprise Applications Database & Cloud ✅ PostgreSQL ✅ MongoDB ✅ MySQL ✅ Supabase ✅ Firebase ✅ Redis ✅ AWS ✅ Azure ✅ Google Cloud ✅ Docker ✅ CI/CD ✅ Vercel ✅ DigitalOcean Automation & Integrations Custom runners connecting CRMs, payment systems, databases, and third-party platforms. REST APIs, webhooks, OAuth, scheduled jobs - battle-tested across 500+ delivered systems. Industries I Work With 🏥 Healthcare 💰 FinTech 🛒 Ecommerce 🏠 Real Estate 📚 Education 📞 Customer Support 📈 Marketing ⚖ Professional Services 🚚 Logistics 🏢 SaaS Platforms What I Deliver ✅ AI-Powered SaaS Platforms ✅ AI Chatbots & Virtual Assistants ✅ Intelligent Business Automation ✅ Custom Dashboards ✅ High-Performance APIs ✅ Scalable Backend Systems ✅ Responsive Frontend Applications ✅ Cloud Deployment ✅ Production-Ready Code ✅ Long-Term Maintenance My Development Process Discovery Understand your business goals, users, technical requirements, and project scope before writing a single line of code. Development Build scalable architecture with clean code, regular updates, testing, documentation, and continuous feedback. Deployment Deploy securely to production with monitoring, documentation, and post-launch support. Why Clients Choose Me ✅ Strong AI & Full-Stack Expertise ✅ Business-Oriented Development ✅ Clean & Scalable Architecture ✅ Excellent Communication ✅ Fast Response Time ✅ Reliable Delivery ✅ Long-Term Partnership ✅ Performance-Optimized Solutions Let's discuss your project. I can help you go from idea → architecture → implementation → deployment with a system designed for long-term success.

Need an AI agent that works reliably in production—not another fragile demo? I’m a Top Rated AI Agent & RAG Engineer with 100% Job Success, $20K+ earned, and 29 completed and ongoing Upwork jobs. I build production AI agents, RAG knowledge systems, MCP tools, Telegram bots, workflow automation, and scalable Python/FastAPI backends. I help businesses turn manual processes or vague AI ideas into systems that can run unattended, call APIs and tools, validate outputs, recover from failures, and hand work back to a human when needed. Recent product work: • Halgo — an AI tutor workspace that indexes learning content and generates personalised homework. • mySkua — a Telegram growth and analytics platform supporting around 4.7K users, with attribution, segmentation, campaigns, broadcasts, and analytics. • Production automation projects involving browser workflows, structured data extraction, APIs, document processing, and internal AI tools. What I can build: • AI agents and multi-agent workflows • RAG systems, vector search, and knowledge bases • MCP servers and agent-facing tools • LLM integrations using OpenAI, Claude, and OpenRouter • Python/FastAPI APIs and backend services • n8n, Make, CRM, and workflow automation • Telegram bots and Mini Apps • Browser automation, OCR, and structured document extraction Typical stack: Python, FastAPI, OpenAI, Claude, MCP, LangGraph, LangChain, PostgreSQL, Redis, Docker, Playwright, vector databases, REST APIs, webhooks, n8n, and Telegram API. Production reliability is part of the build: structured outputs, JSON Schema validation, retries, fallbacks, logging, monitoring, permission boundaries, human handoff, and maintainable architecture. Send me your current workflow, data sources, and desired result. I’ll help identify the fastest practical first version and the risks worth solving early.

I’m a Python Full-Stack Developer with 8+ years of experience building SaaS platforms, APIs, dashboards, admin systems, and production web applications using Python, FastAPI, Flask, React, and Next.js. I work across the full product stack, from backend architecture, databases, and APIs to frontend development, integrations, deployment, and ongoing improvements. My main areas of work include: 𝐏𝐲𝐭𝐡𝐨𝐧 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 & 𝐀𝐏𝐈 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 FastAPI, Flask, Django, PostgreSQL, REST APIs, authentication, permissions, background jobs, business logic, and third-party integrations. 𝐑𝐞𝐚𝐜𝐭 & 𝐍𝐞𝐱𝐭.𝐣𝐬 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Responsive SaaS applications, dashboards, customer portals, admin panels, complex forms, and data-driven interfaces using React, Next.js, TypeScript, JavaScript, and Tailwind CSS. 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐒𝐚𝐚𝐒 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Complete web applications covering frontend, backend, databases, APIs, user accounts, roles and permissions, subscriptions, reporting, integrations, and admin systems. 𝐀𝐖𝐒 & 𝐃𝐞𝐩𝐥𝐨𝐲𝐦𝐞𝐧𝐭 AWS infrastructure, Docker, CI/CD, production environments, database deployment, monitoring, and performance improvements. I also work with Vue.js and have strong experience with Node.js, NestJS, Express.js, and MongoDB, which is useful when maintaining existing systems or working with products that use multiple backend technologies. Clients usually bring me in when they need someone who can understand an existing system quickly, take ownership of both frontend and backend development, and deliver features without adding unnecessary complexity. Whether you are building a new SaaS product, developing Python APIs, improving a React or Next.js application, or maintaining an established platform, I can help.