I build full-stack SaaS products and AI features that ship, not just demo well, most of it building booking platforms, CRMs, and data-heavy dashboards that businesses run on every day. My backend work splits between Python (FastAPI, Django) and Node.js (NestJS, Express), with React and Next.js on the front. Lately that's meant production AI: a multi-agent CRM copilot built on LangGraph, RAG chatbot backends with vector search (pgvector, Pinecone), and an MCP server with dynamic tool loading secured via OAuth 2.1. Before the AI wave, I spent years on the fundamentals: a vacation-rental SaaS handling bookings, availability, Stripe payments, and smart-lock automation (Rentals United, Seam); healthcare and EdTech frontends; microservices on AWS and GCP with Docker, Kubernetes, and GitHub Actions. How I work: - Quick discovery call or API spec review within 24-48 hours - Clear scope and milestones, no scope creep surprises - Measurable targets, for example latency and error-rate goals - Weekly demo with reviewable Git history - Handover docs and runbooks so you're never stuck without me I've delivered measured wins, like 50% solved user flow, work spans Healthcare and EdTech, also ERP, real time dashboards. Role based admin, Audit trails and compliance built in. Availability: 30 to 40 hrs per week. I've worked with planned US and EU overlap. Fixed price or T&M. Send the current bottleneck and I'll reply within 24 hours with a clear plan and timeline.

In 10+ years, I have shipped products used by real businesses across AI automation, SaaS platforms, mobile apps, and enterprise integrations. ➝ Built an enterprise AI agent orchestration platform supporting GPT-4o, Claude, and Gemini with real-time monitoring, governance controls, and automated workflows across Marketing, HR, Supply Chain, and Customer Success. ➝ Built production n8n and Make automation systems connecting Xero, Shopify, CRMs, and third-party APIs with webhook-driven workflows, idempotency engines, and zero-error track records since deployment. ➝ Built multi-tenant SaaS platforms with schema-based data isolation, RLS policies, role-based access control, Stripe subscription billing, and full admin dashboards running in production. ➝ Integrated OpenAI, Claude, Azure OpenAI, and LangChain into real products, building AI agents, RAG pipelines, document processing systems, and agentic voice workflows using Retell.ai. ➝ Engineered custom NLP engines with 93.3% entity accuracy, sub-20ms responses, and scalable processing across 500+ products in a 5-step state machine. ➝ Developed React Native and Flutter apps with real-time features, third-party payments, and map integrations, delivered simultaneously on iOS and Android with 100k+ combined users. ➝ Built and integrated complex third-party systems including DocuSign contract workflows, IMAP email ingestion, Xero accounting automation, government compliance APIs, G2A catalog sync, and multi-system automation pipelines. ➝ Worked across SaaS, healthtech, logistics, e-commerce, sports, fintech, real estate, and AI automation, adapting quickly to domain requirements without hand-holding. ➝ Maintained a 100% Job Success Score with Top Rated Freelancer, across 150+ completed Upwork projects with long-term client relationships and on-time delivery. My stack covers the full product: ➝ AI Automation & LLM Integrations • OpenAI, Claude, Gemini API, LangChain, Pinecone, FAISS, RAG Architecture • AI Agents, n8n, Make, Zapier, Retell AI Voice Agents, Workflow Automation ➝ Frontend Development • React, Next.js (App and Pages Router), Vue.js, TypeScript • Tailwind CSS, shadcn/ui, Redux, React Query, Framer Motion ➝ Backend Development • Node.js, NestJS, Express.js, Python, Django, FastAPI, Flask • Supabase, Firebase, REST APIs, GraphQL • WebSockets, Socket IO, JWT and OAuth ➝ Mobile Development • React Native (Expo & CLI), Flutter • Real-time chat & video (Twilio, Agora, WebRTC) • Stripe, Maps, Push Notifications ➝ Database & Cloud • PostgreSQL, MySQL, MongoDB, Redis • AWS (S3, EC2, Amplify), Google Cloud I work best with founders and technical leads who need one reliable engineer to own the build end-to-end. I communicate clearly, flag blockers early, and treat your deadline as mine. Send me a message with your requirements, and I will outline your technical roadmap within hours. Bhavin Sen

I'm a full stack developer with 8+ years building production web applications. I specialize in React/Next.js frontends, Node.js and Python backends, and AI-powered SaaS products. Clients hire me when they need someone who can handle the complete stack independently from database design to deployment, and deliver systems that scale reliably. 📊 𝐓𝐑𝐀𝐂𝐊 𝐑𝐄𝐂𝐎𝐑𝐃: ⭐ Top Rated Plus Developer 💰 $70,000+ Earned on Upwork 🏆 100% Job Success Score ⏱️ 8+ Years Production Experience 🔄 50+ Projects Delivered 💼 𝐖𝐇𝐀𝐓 𝐈 𝐁𝐔𝐈𝐋𝐃 𝐒𝐚𝐚𝐒 𝐀𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬 (𝐄𝐧𝐝-𝐭𝐨-𝐄𝐧𝐝): Complete product development from MVP to production with frontend, backend APIs, databases, payment integration, and cloud deployment. 𝐑𝐞𝐚𝐜𝐭 & 𝐍𝐞𝐱𝐭.𝐣𝐬 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝𝐬 Dashboards, admin panels, customer portals, and data visualization. Performance-optimized with 40-60% faster load times. 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 Node.js, Python/Django, and Ruby on Rails APIs with authentication, background workers, and scalable database architecture. 𝐀𝐈 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧 OpenAI-powered features, automated workflows, and intelligent data processing in production applications. 𝐓𝐡𝐢𝐫𝐝-𝐏𝐚𝐫𝐭𝐲 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: Stripe/Paddle payments, Shopify, CRMs, email/SMS services, and custom API connections. 🎯 𝐂𝐋𝐈𝐄𝐍𝐓𝐒 𝐇𝐈𝐑𝐄 𝐌𝐄 𝐅𝐎𝐑: ✓ Building SaaS MVPs that scale ✓ Developing admin dashboards and internal tools ✓ Creating Node.js or Python backend APIs ✓ Fixing slow React/Next.js applications ✓ Adding AI features to existing products ✓ Independent full stack execution ✓ Taking over incomplete projects 🏗️ 𝐏𝐑𝐎𝐃𝐔𝐂𝐓𝐈𝐎𝐍 𝐒𝐘𝐒𝐓𝐄𝐌𝐒 𝐁𝐔𝐈𝐋𝐓: 𝐏𝐥𝐚𝐧𝐧𝐞𝐫 𝐀𝐈 – 𝐀𝐈-𝐏𝐨𝐰𝐞𝐫𝐞𝐝 𝐏𝐥𝐚𝐧𝐧𝐢𝐧𝐠 𝐒𝐚𝐚𝐒 Next.js app where users generate business plans using OpenAI and download PDFs. Serverless architecture with background processing and cloud storage on Netlify. 𝐃𝐬𝐡𝐨𝐩 – 𝐄-𝐜𝐨𝐦𝐦𝐞𝐫𝐜𝐞 𝐀𝐧𝐚𝐥𝐲𝐭𝐢𝐜𝐬 𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦 React TypeScript frontend with Django backend processing thousands of Shopify orders daily. Background workers handle data sync and automated reporting. 𝐕𝐢𝐫𝐚𝐥 𝐇𝐞𝐚𝐝𝐬𝐡𝐨𝐭𝐬 𝐀𝐈 – 𝐒𝐮𝐛𝐬𝐜𝐫𝐢𝐩𝐭𝐢𝐨𝐧 𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦 Next.js SaaS with Supabase backend. Users subscribe and generate AI headshots. Integrated Astria AI, Stripe/LemonSqueezy payments, and credit systems. 𝐓𝐫𝐚𝐝𝐢𝐧𝐠 𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦 – 𝐅𝐢𝐧𝐚𝐧𝐜𝐢𝐚𝐥 𝐃𝐚𝐬𝐡𝐛𝐨𝐚𝐫𝐝: Full stack application with real-time data, Node.js API, PostgreSQL database, and complex charting. Handles high-frequency updates and user portfolios. 𝐀𝐩𝐩𝐨𝐢𝐧𝐭𝐦𝐞𝐧𝐭 𝐒𝐲𝐬𝐭𝐞𝐦 – 𝐁𝐨𝐨𝐤𝐢𝐧𝐠 & 𝐑𝐞𝐦𝐢𝐧𝐝𝐞𝐫𝐬: React frontend with Rails backend. Automated SMS/email reminders via Twilio/SendGrid. Reduced no-shows by 40%. 🚀 𝐓𝐄𝐂𝐇𝐍𝐈𝐂𝐀𝐋 𝐒𝐓𝐀𝐂𝐊: Frontend: React.js, Next.js, TypeScript, Angular, Tailwind CSS Backend: Node.js, Python/Django, Ruby on Rails, PHP/Laravel Databases: PostgreSQL, MongoDB, Supabase, MySQL, Redis AI/ML: OpenAI API, LangChain, Pinecone, Prompt Engineering Cloud: AWS (EC2, S3, Lambda), Vercel, Netlify, Heroku, Docker Payments: Stripe, Paddle, LemonSqueezy, PayPal Tools: Git, CI/CD, Jest, API Documentation ✅ 𝐑𝐄𝐒𝐔𝐋𝐓𝐒 𝐘𝐎𝐔 𝐆𝐄𝐓: → 40-60% faster frontend performance → Reliable payment and authentication systems → Clean, maintainable code with documentation → Independent execution without constant oversight → Production-stable systems handling real traffic 🤝 𝐇𝐎𝐖 𝐈 𝐖𝐎𝐑𝐊: - Clear communication with regular updates - Weekly demos and milestone reviews - Fast response during business hours - Flexible with time zones - Available for ongoing maintenance 📩 𝐑𝐄𝐀𝐃𝐘 𝐓𝐎 𝐒𝐓𝐀𝐑𝐓? If you need a full stack developer who handles frontend, backend, databases, AI integration, and deployment independently, let's discuss your project. I'll review requirements and send a detailed proposal with timeline within 24 hours.

⭐️Your 𝐑𝐄𝐋𝐈𝐀𝐁𝐋𝐄 tech partner who won’t miss 𝐃𝐄𝐀𝐃𝐋𝐈𝐍𝐄𝐒⏰,won’t break the 𝐁𝐀𝐍𝐊 💰 and will deliver a 𝐒𝐂𝐀𝐋𝐀𝐁𝐋𝐄 𝐒𝐎𝐋𝐔𝐓𝐈𝐎𝐍📈that won’t need to be rebuilt from scratch later🔧 💡 138+ production-grade products shipped (SaaS, MVPs, AI systems, marketplaces) 💰 $17.2M+ revenue generated for client products 👥 168K+ active users powered by systems I built ⚡ 1.15M+ API requests/month at 99.9% uptime 🚀 MVP → production in 2–6 weeks, built to scale from day one 🔥 WHY SHOULD YOU HIRE ME 10+ years as Front End Developer, React Developer, and Full Stack Developer React Node delivering SaaS Platforms, MVPs, AI Products, Marketplace Platforms, CRM Systems, and Enterprise Web Applications. 138+ production products shipped as Front End Developer, React Developer, and Full Stack Developer React Node. 43+ SaaS Platforms delivered as React Developer and Full Stack Developer React Node using React.js, Next.js, TypeScript, Node.js, PostgreSQL, Supabase, and AWS. 33+ frontend applications built as Front End Developer including dashboards, admin panels, customer portals, responsive UI, and complex business platforms. 27+ backend systems developed as Full Stack Developer React Node with Node.js, Express.js, NestJS, REST API, GraphQL, databases, authentication, and cloud infrastructure. 16+ Marketplace Platforms built as React Developer and Full Stack Developer React Node with payments, subscriptions, workflows, and scalable architecture. 13+ AI Products created as React Developer using OpenAI API, Claude API, RAG, AI Agents, LangChain, and automation. INDUSTRIES I SERVE For LegalTech founders - 6+ Case Management Systems, Document Workflows, Client Portals, Compliance SaaS For Healthcare & MedTech - 8+ Patient Platforms, Telehealth, HIPAA-Compliant data, Clinic Management SaaS For Logistics & supply chain - 5+ Logistics Platforms, real-time tracking (sea/air/truck), Project44, INTTRA, EDI For Marketplace & e-commerce - 15+ Multi-Vendor Marketplaces, B2B & Two-Sided Marketplace, Stripe, bidding, complex search For AI startups - 12+ AI-Powered products: OpenAI / Claude API / LLM, RAG Chatbots, AI Agent Platforms, vector DBs, FastAPI, browser extensions For No-code & enterprise SaaS - 10+ Form Builders, Admin Dashboards, Internal Tools, Microservices, Multi-tenant For Media, AdTech & publishing - 6+ Publisher Platforms, CMS, payment gateways, Analytics Dashboards For Real estate & PropTech - Property Listings, Bidding & Auction systems, Agent Dashboards RESULTS DELIVERED 168K+ active users powered by applications built as Front End Developer, React Developer, and Full Stack Developer React Node 1.15M+ API requests/month with 99.9% uptime using scalable backend architecture 36% fewer bugs through better React.js architecture and clean development processes 42% faster frontend performance through React optimization and modern UI practices 31% conversion improvement through better UX, React interfaces, and performance improvements 40–60% lower backend latency through Node.js optimization and scalable infrastructure 5–8 weeks faster MVP delivery as Full Stack Developer React Node HOW I BUILD As a Front End Developer I build modern interfaces with React.js, ReactJS, Next.js, TypeScript, JavaScript, Tailwind CSS, Redux, Zustand, React Query, shadcn/ui, responsive design, and reusable components. As a React Developer I create SaaS Platforms, AI Applications, Marketplace Platforms, CRM Systems, dashboards, and web applications focused on speed, scalability, and conversion. As a Full Stack Developer React Node I deliver complete solutions with Node.js, Express.js, NestJS, PostgreSQL, Supabase, Prisma, MongoDB, Redis, REST API, GraphQL, WebSockets, AWS, Docker, and CI/CD. TECH STACK Frontend: React.js, ReactJS, Next.js, TypeScript, JavaScript, Redux, Zustand, Tailwind CSS, shadcn/ui, HTML5, CSS3. Backend: Node.js, Express.js, NestJS, Python, FastAPI, REST API, GraphQL, WebSockets. Database: PostgreSQL, Supabase, Prisma, MongoDB, MySQL, Redis, Firebase. Cloud: AWS, Lambda, EC2, S3, CloudFront, Docker, CI/CD, Vercel, Netlify. AI & Integrations: OpenAI API, Claude API, LangChain, RAG, AI Agents, Stripe, Shopify, Twilio. Looking for a Front End Developer, React Developer, or Full Stack Developer React Node to build, scale, or improve your product? Click "Invite" and let's build a production-ready solution. Keywords: Frontend React Developer, React.js Developer, React Next.js Developer, Full Stack React Developer, Node.js Developer, React Native Developer, Frontend React Engineer, Full Stack Engineer, SaaS Frontend, Marketplace React, High-Performance React, React + Node.js, Next.js SSR, Redux, Zustand, Tailwind CSS, API Integration, Real-Time Systems, Dashboard React, Payments Stripe, Mobile React Native. Frontend React Developer, React.js Developer, React Next.js Developer, Full Stack React Developer,

$100K+ Earned | 42 Jobs Completed | 100% Job Success | 15+ Years of Experience If you need an AI system, SaaS platform, or cloud backend built right the first time - without the back-and-forth, scope creep, and "we'll figure it out later" approach - you're in the right place. ✔️ I work best with founders and product teams who are thinking: - "I need an AI agent or LLM system that actually works in production, not just a prototype" - "I need someone who owns the architecture, not just the code" - "I've been burned by developers who disappear after delivery - I need reliability" - "I need the full stack handled - frontend, backend, DevOps, AI - by one person who gets it all" ✔️ Working with me, you get: 🌟 End-to-end ownership: from system architecture and AI integration to deployment, scaling, and ongoing automation 🌟 Production-grade AI systems: RAG pipelines, multi-agent workflows, LLM integrations using LangChain, OpenAI, and Claude 🌟 Cloud-native infrastructure: AWS, Azure, GCP, Docker, Kubernetes, CI/CD - built to scale from day one 🌟 12+ years of full stack depth: React, Node.js, Next.js, Python, Django, GraphQL, and more ✔️ We might not be the right fit if: ✗ You need the cheapest option available - I focus on quality and long-term value, not the lowest bid ✗ You have no clear vision for what you're building - I work best with founders who know their product direction ✗ You need someone to "just code" without thinking about architecture or outcomes [ INDUSTRIES I'VE BUILT FOR ] - FinTech & Banking | Healthcare & MedTech | LegalTech & Compliance - EduTech & E-Learning | E-Commerce & Retail | Logistics & Supply Chain - Real Estate & PropTech | Travel & Hospitality | InsurTech | Manufacturing & Distribution - Cybersecurity | Media & Publishing | AI/ML & Data Analytics [ WHAT I BUILD ] - AI SaaS Platforms & Multi-Tenant SaaS Applications - AI Agent Systems, Chatbots & LLM-Powered Applications - Booking Platforms, Marketplaces & Customer Portals - ERP, CRM, LMS, EHR & Case Management Systems - Progressive Web Apps (PWA) & Cloud-Native Applications - DevOps Pipelines & Infrastructure Automation [ MY TECH STACK ] - Frontend - React, Next.js, Vue.js, TypeScript, Tailwind CSS - Backend - Node.js, Python, Django, FastAPI, Nest.js, GraphQL - AI & ML - LangChain, OpenAI API, Claude, RAG Pipelines, Multi-Agent Systems - Cloud - AWS, Azure, GCP, Docker, Kubernetes, Terraform, CI/CD - Databases - PostgreSQL, MongoDB, MySQL, DynamoDB, Redis, Elasticsearch - Security - OAuth, JWT, SSL/TLS, OWASP, SonarQube [ CORE SKILLS ] - AI Agent Development | LLM Integration | RAG Pipeline Development - Multi-Agent System Architecture | Full-Stack SaaS Development - Mobile & Web Application Development | API Design & Integration - Cloud Solution Architecture | DevOps & AIOps Engineering - Database Design & Management | Infrastructure as Code (IaC) What I bring that most developers don't - I don't just write code. I make architecture decisions, set up infrastructure, automate the deployment pipeline, and ensure the system scales correctly from day one. You get a single point of ownership across the entire build, not a developer who stops at the code and hands off the rest. If your project involves AI agents, LLM integration, SaaS platform development, or cloud infrastructure - and you need someone who can own it end to end - let's talk. A 20-minute call is usually enough to know if we're a good fit.

I am a Top Rated Python and .NET Developer with 16,000+ hours on Upwork and extensive experience helping companies build reliable REST APIs, integrate AI services, and ship production-ready backend systems on AWS and Azure. If you need a Python or .NET developer who can handle AI integration (OpenAI, AWS Bedrock, Azure OpenAI, Gemini, or any LLM API), cloud automation, and REST API development without hand-holding or vague timelines, that is exactly what I deliver. What I can help you with: • Python backend services: FastAPI, Flask, REST API development • .NET and C# Web APIs using ASP.NET Core • AI integration: OpenAI, AWS Bedrock, Azure OpenAI, LLM APIs, and RAG pipelines • AWS: Lambda, S3, SQS, API Gateway, EC2, and serverless automation • Azure: Azure Functions, Azure OpenAI, cloud services, and background jobs • API integration and third-party system automation workflows • SQL Server, PostgreSQL, Redis: performance tuning and reliability • React-based admin panels when full-stack ownership is needed Clients usually hire me to: • Modernize legacy systems without breaking production • Diagnose and fix unstable APIs or backend issues • Build new backend features with clean architecture and solid validation • Add AI capabilities into existing applications in a practical, maintainable way • Improve deployment confidence, observability, and handover quality How I work: • Clear communication and fast response, so you always know where things stand • Practical planning with concrete next steps before writing a single line of code • Production-focused engineering with logging, error handling, testing, and maintainable code • Reliable delivery without unnecessary complexity If you have an existing codebase, I can quickly review the setup, identify the highest-priority issues, and propose the best path forward. If you are starting something new, I can help design and build it in a way that is clean, scalable, and easy to maintain long term. 16,000+ hours. 129 jobs. Let's build something that works.

I’m a Top Rated Plus AI Full Stack Developer with 8+ years of experience building scalable SaaS platforms, AI-powered applications, and cloud-native systems using React, Next.js, TypeScript, Laravel, and Python. I help startups and product teams move from idea → MVP → production → scale with clean architecture, intelligent automation, and AI integrations designed for long-term growth. If you’re building: • A SaaS platform with React or Next.js • A TypeScript-based modern frontend • A Python (FastAPI/Django) or Laravel backend • A GPT or LLM-powered application • A RAG-based knowledge system with vector search • A scalable multi-tenant SaaS architecture • A production-ready MVP I can architect and deliver it correctly from day one. AI-Accelerated Development Workflow: I operate in an AI-native development environment to accelerate delivery while maintaining clean, scalable architecture. My workflow includes: • GitHub Copilot & Cursor for intelligent code acceleration • ClaudeCode with MCP for agent-driven engineering • Replit Agents & Lovable.dev for rapid MVP prototyping • v0 & AI-assisted UI generation for fast frontend iteration • Google Antigravity & advanced AI coding environments for experimentation and optimization • OpenAI-powered automation and rapid system validation AI & LLM Systems: • OpenAI / GPT integrations • Claude & Gemini integrations • LangChain workflows • Retrieval-Augmented Generation (RAG) • Vector database integration (Pinecone, embeddings, semantic search) • AI agents & AI copilots • NLP-powered applications • TensorFlow, PyTorch integration • AWS SageMaker deployments Full Stack SaaS Engineering: • React & Next.js frontend architecture • TypeScript-based scalable UI systems • Laravel & Python (FastAPI, Django) backend development • Node.js, Express.js, NestJS APIs • REST, GraphQL & WebSockets • Multi-tenant SaaS platforms • Stripe billing & subscription systems • Admin dashboards & analytics panels Architecture & Infrastructure: • PostgreSQL, MySQL, MongoDB, Firebase • Pinecone vector database systems • Supabase & scalable BaaS platforms • Microservices & serverless architecture • AWS (Lambda, EC2, S3) • Docker & Kubernetes • Nginx production deployments • CI/CD pipelines & containerized environments If you’re looking for a Top Rated Plus engineer who understands both AI systems and scalable SaaS architecture - let’s build something powerful. Keywords: AI Developer, AI Engineer, AI SaaS Developer, Generative AI Developer, GPT Developer, OpenAI Developer, Claude Developer, LLM Application Developer, RAG Developer, Vector Database Developer, Pinecone Developer, Semantic Search Developer, AI Agent Developer, LangChain Developer, AI Automation Expert, Full Stack Developer, SaaS Developer, MVP Developer, React Developer, Next.js Developer, TypeScript Developer, Python Developer, FastAPI Developer, Django Developer, Laravel Developer, Node.js Developer, GraphQL Developer, AWS Developer, Microservices Architect, n8n, Replit, Lovable, Full Stack Developer

I build production Algo-trading systems, from market data ingestion to live execution; for funds, prop desks, and serious retail traders. 9+ years in software engineering, the last several spent almost exclusively on trading infrastructure: IBKR/MT5/FIX execution, tick-level data pipelines, and causal ML for signal generation. I run my own live trading platform, so I'm not learning on your dime — I ship what I already operate. What I Build: ⤷ End-to-end algo trading systems (data → signal → execution → risk) ⤷ Broker/exchange integrations: IBKR API, MT4/MT5 (MQL5 EAs), Binance, Bybit, Polymarket ⤷ Low-latency execution infrastructure (Dockerized IB Gateway, multi-instance live trading, C# ↔ MQL5 bridges) ⤷ Causal inference for markets: PCMCI+, VarLiNGAM, DYNOTEARS, Granger/Transfer Entropy — used to filter spurious signals before they hit a backtest ⤷ ML signal models: LightGBM, XGBoost, LSTM/TCN, meta-labeling over causal-discovery gates ⤷ Backtesting & research stacks: NautilusTrader, Backtrader, Zipline, QuantConnect, Qlib ⤷ Market microstructure work: LOB/MBP-10 data, Hawkes processes, Hayashi-Yoshida covariance, price discovery (Hasbrouck/Gonzalo-Granger) ⤷ Options pricing & Greeks (Black-76, BSM, second-order Greeks) for hedging and 0DTE workflows ⤷ Financial data engineering: Databento, TimescaleDB, Parquet/Arrow pipelines Core Stack: ✓ Backend: Python (FastAPI, Django), C#/.NET, Rust, C++ ✓ Data: TimescaleDB, PostgreSQL, Redis/Valkey, Parquet, Apache Arrow/PyArrow ✓ Cloud/Infra: AWS (ECS, Lambda, RDS), Docker, Terraform, Packer, GitHub Actions CI/CD ✓ Trading: IBKR API, MetaTrader 5/MQL5, TradingView, Databento (GLBX.MDP3/MBP-10) ✓ ML/Causal: PCMCI+, CMIknn, LightGBM, XGBoost, scikit-learn, statsmodels Why Clients Choose Me: ✓ I operate a live trading platform myself — I understand uptime, restart cycles, and the failure modes that only show up in production ✓ Rigorous methodology: I don't just backtest, I stress-test causal assumptions before trusting a signal ✓ Clean, documented handover — you're not locked into me ✓ Clear async communication with regular progress updates Recent Results: - Rebuilt an IBKR Gateway deployment to eliminate recurring 12-hour restart cycles caused by GDI handle leaks - Designed a causal-discovery pipeline (PCMCI+/CMIknn) identifying dominant cross-asset drivers in equity stress regimes - Architected a C# Worker Service + MQL5 EA bridge for automated MT5 execution - Live trading volume: $80M+ across managed strategies (2025) - Built AWS Savings Plan / Reserved Instance cost model cutting infra spend without sacrificing uptime SLAs Send me your requirements and I'll respond within 2-6 hours with a concrete plan — not a template pitch.

Here are feedbacks from my previous clients: "Direct Quote from FAANG measurement manager who worked with Hamza for over 1.5 years: "I had the privilege of working alongside Hamza in his role as a Senior Cloud & Back End Engineer. Hamza's comprehensive understanding of computer science, architectural and design patterns, and cloud technologies played a pivotal role in the success of our initiatives. His acumen in developing and implementing robust, scalable solutions was apparent in our marketing campaign planner. His expertise in Python, Javascript, and his adept use of databases like PostgreSQL and Firebase made him an integral part of our team. Hamza's proficiency in leveraging Google Cloud Platform was instrumental in enhancing our project's performance. He skillfully increased our systems' efficiency by utilising GCP MemoryStore, and his efficient handling of background tasks using Cloud Run and Cloud Scheduler was truly commendable. His pragmatic approach to backend development and extensive knowledge of API design and web security significantly contributed to the stability and performance of our software. Hamza's ability to balance his advanced technical skills with excellent communication abilities set him apart. His commitment to the team, made him a reliable team player. His dedication extended to meticulously reviewing the code developed by others, and his feedback invariably improved our productivity and work quality. I confidently recommend Hamza for any role requiring expertise in cloud and backend engineering. His potent combination of cloud and backend skills, coupled with his professional dedication, will undeniably be an asset to any team fortunate enough to have him"" --- "A really professional Dev Ops expert. Hamza is highly organised and very responsive. Managed to get a really tricky Google Cloud job done for me with a minimum of fuss. Definitely recommended, great work 10/10, thanks." --- "Did a great job - 10/10. One of the most thoroughly organised and responsive freelancers I have worked with. Did an excellent job in every area. This job was for a tough Google Cloud Dev Ops job based on a Strapi installation. He solved all the problems properly and communicated clearly and efficiently throughout the entire job. Overall very happy with the result and definitely wouldn't hesitate to recommend. Excellent work." --- "Hamza is AMAZING. He is so quick at the tasks because he is so experienced in python. We already have multiple jobs lined up for him on our project. He is going to be our python wizard! He is also very easy / kind to work with. Highly recommended." ---------- For several years, I have focused on deploying web applications and big data pipelines on Google Cloud Platform, utilizing its services such as Google App Engine, Cloud Run, Cloud Functions, Google Compute Engine, BigQuery, Dataflow. Load Balancer, Cloud CDN and Cloud Armor. My expertise lies in programming Python web and data applications, primarily using Django, Flask, FastAPI, and Webapp2 frameworks. Additionally, I have knowledge of other web technologies such as React JS, HTML, CSS, and JavaScript. I am always open to new challenges and problems, continually enhancing my skills and knowledge across various areas. I also have experience with web scraping for e-shops and real estate websites using tools like Scrapy, Playwright, Selenium, and BeautifulSoup.

Full-stack developer with 4+ years of experience building production web applications — 15+ projects delivered, including e-commerce platforms, analytics dashboards, CMS systems, and real-time applications used by thousands of users. I design backend architectures, high- performance APIs, and cloud infrastructure that scale as the product grows — and I build the AI layer directly into those systems: RAG pipelines and LLM-powered features shipped on real production projects, not demos. BACKEND: Python (Django REST Framework, FastAPI, Flask), Java (Spring Boot), Node.js (Express.js, NestJS) FRONTEND: React, Next.js, Vue.js AI / LLM: OpenAI API, RAG pipelines, vector search on Microsoft SQL Server (MSSQL) DATABASES: PostgreSQL, MySQL, MongoDB, MSSQL, Firebase, SQLite CLOUD & INFRA: AWS (EC2, S3, Lambda, ECS, Fargate), GCP (Cloud Run), Docker, Kubernetes, CI/CD (Jenkins, GitHub Actions), Terraform, Redis, RabbitMQ, Celery How I help clients: - Design scalable backend architectures for SaaS platforms - Build high-performance REST APIs for web and mobile applications - Build RAG-based document Q&A systems — e.g. a chatbot that lets users upload large files and ask natural-language questions against them, retrieving relevant context via vector search instead of making users search manually - Optimize databases and backend performance - Set up automated CI/CD pipelines and cloud infrastructure (Terraform, Docker) Recent work: 1. Walmart Virtual Stores CMS — Backend lead on a CMS powering a mobile app that lets users create virtual storefronts with custom themes and 3D product placement, built on Walmart's product catalog. Designed a role-based, multi-stage approval workflow for product onboarding and publishing, and set up CI/CD and cloud infrastructure (Terraform, GCP Cloud Run, AWS ECS). 2. Rentpe — Product Rental Platform — Designed and built an e-commerce rental platform from the ground up using Java/Spring Boot microservices, architected for thousands of concurrent vendors and consumers, with a hybrid PostgreSQL + Firebase setup for real-time product status updates. 3. RAG Document Q&A Chatbot — Built with Python (Flask), using SQL Server (MSSQL) as the vector store. Lets users upload large documents and ask natural-language questions about their contents; retrieves relevant sections via vector search and generates grounded answers with an LLM, so users don't have to manually search through long files. Notable because it runs on standard MSSQL rather than a separate vector database — useful for enterprise clients who already run SQL Server and don't want new infrastructure. If you're looking for a developer who can design, build, and scale your application — AI features included — from idea to production, let's discuss your project.