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Next.js developer, Node.js developer and Deployment Engineer. I fix Vercel deployment failures, AWS and VPS downtime, and broken auth. Recently cut a client's Railway bill by 40%. 10 live apps built, deployed and maintained. 100% Job Success and 5 stars on every reviewed contract. Most bugs fixed within 24 hours. Send the error first. I work US and EU hours. Send an error at 9am EST and I am on it the same morning. Almost every job I take starts the same way. The app runs fine on your machine, then breaks the moment it goes live. A Vercel build that passes locally and dies on deploy. A Railway container that crashes seconds after startup. A VPS that falls over under real traffic. These bugs live in the server, not the code, so I read the deployed logs and build output instead of guessing. Here is a recent one. A Node.js backend crashed only at busy times. Local tests never caught it because the database connection pool only hit its limit when real users arrived together. One config change ended it, and it has stayed up since. ✔ TRACK RECORD ▸ 100% Job Success Score ▸ 5.0 stars on every reviewed contract, no exceptions ▸ 10 live apps deployed and maintained on Vercel, AWS and Linux VPS ▸ Single bugs fixed within 24 hours, deployment failures within 48 ▸ Every deployment I have taken over has shipped clean releases since ✔ WHAT I FIX ▸ Next.js deployment and Node.js deployment on any platform or your own server ▸ Vercel deployment, Railway deployment, Render, AWS deployment and VPS deployment ▸ Next.js bug fix: hydration errors, broken API routes, build errors ▸ Node.js bug fix: crashes, runtime errors, environment variable problems ▸ Authentication: JWT, OAuth, Clerk, NextAuth, sessions and RBAC ▸ Docker, CI/CD pipeline, Nginx, PM2 and Linux server management ▸ Apps built with Cursor, Lovable, Bolt or Replit that broke after the demo ✔ WHO HIRES ME ▸ Founders whose app builds locally but fails on Vercel, Railway, AWS or a VPS ▸ Teams that need production stable again fast ▸ People who built an app with AI tools and need it finished properly ▸ Developers who inherited a codebase they do not trust ✔ HOW I WORK A lot of deployment fixes only hide the problem, so the same failure comes back on the next release. I find the real cause in the config, the dependencies or the environment, then watch several live releases before I call it done. You get a short note explaining what was actually wrong, in plain words. ✔ ONGOING WORK: WEBSITE MAINTENANCE I currently keep 10 live apps running on Vercel, AWS and Linux VPS. Most clients start with one fix and stay for monthly website maintenance. I watch the deploys, renew SSL before it expires, keep dependencies current, and handle server management on Nginx, PM2 and Linux. When something breaks, I fix it. No new contract, no waiting. ✔ NEW DEPLOYMENTS, NOT JUST FIXES I also set up deployments from scratch. Next.js deployment, Node.js deployment, React apps, static sites and web services, onto Vercel, Render, Railway, AWS, DigitalOcean or any Linux VPS. That includes Docker, a GitHub Actions CI/CD pipeline, domain and DNS records, SSL, and Nginx with PM2 in front. You get a deploy that runs itself on every push instead of one you have to babysit. ✔ BEYOND FIXES As a Next.js developer and Node.js developer I also build complete apps: Server Components and SSR on the front, Express and REST APIs on the back, PostgreSQL or MongoDB for data, and auth built in from day one. Every build ships deployed and tested. Where a project needs it, I add AI features with the OpenAI API, including RAG chatbots and AI agents trained on your own data. Send the error, the logs, or a screenshot. I will tell you what is likely wrong and what it will cost before anything starts.

🏅 5+ Years Experience 🏅 Full-Stack Web Development Specialist 🏅 Scalable & High-Performance Applications Expert Hi, I'm Hassan, a Software Engineer with 𝟱+ 𝘆𝗲𝗮𝗿𝘀 𝗼𝗳 𝗵𝗮𝗻𝗱𝘀-𝗼𝗻 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 𝗯𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗮𝗻𝗱 𝗱𝗲𝗽𝗹𝗼𝘆𝗶𝗻𝗴 𝘀𝗰𝗮𝗹𝗮𝗯𝗹𝗲 𝘄𝗲𝗯 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 𝗮𝗻𝗱 𝗘𝗥𝗣 𝘀𝘆𝘀𝘁𝗲𝗺𝘀. 𝗜 𝗳𝗼𝗰𝘂𝘀 𝗼𝗻 𝗰𝗿𝗲𝗮𝘁𝗶𝗻𝗴 𝘀𝗼𝗹𝗶𝗱 𝗯𝗮𝗰𝗸𝗲𝗻𝗱 𝗮𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲𝘀 𝗮𝗻𝗱 𝘀𝗺𝗼𝗼𝘁𝗵, 𝗵𝗶𝗴𝗵-𝗽𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗳𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲𝘀 𝘂𝘀𝗶𝗻𝗴 𝗺𝗼𝗱𝗲𝗿𝗻 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 𝗳𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸𝘀. I care deeply about writing clean, maintainable code and delivering solutions that are practical, scalable and aligned with real business goals. 𝗠𝘆 𝗲𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 𝗶𝗻𝗰𝗹𝘂𝗱𝗲: 𝗙𝘂𝗹𝗹-𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁: ✅ Expert in Nest.js and Next.js ✅ Strong command of modern JavaScript (ES6+) ✅ End-to-end application development ✅ RESTful APIs & backend architecture design 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁: ✅ Clean, responsive and user-friendly interfaces ✅ Component-based UI development ✅ Performance and UX optimization 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴: ✅ Scalable and secure server-side development ✅ Business logic implementation ✅ Database design and optimization ✅ Performance-focused API development 𝗖𝗼𝗱𝗲 𝗤𝘂𝗮𝗹𝗶𝘁𝘆 & 𝗧𝗲𝘀𝘁𝗶𝗻𝗴: ✅ Clean, maintainable and testable code ✅ End-to-End (E2E) testing implementation ✅ Best practices for performance and reliability 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 𝗪𝗼𝗿𝗸𝗳𝗹𝗼𝘄: ✅ Agile & collaborative development approach ✅ Clear documentation and structured communication ✅ Requirement analysis before project kickoff 𝗣𝗿𝗼𝗷𝗲𝗰𝘁 𝗛𝗶𝗴𝗵𝗹𝗶𝗴𝗵𝘁𝘀: ✅ Delivered multiple end-to-end web applications and ERP systems ✅ Built scalable backend architectures for growing platforms ✅ Developed core product features from concept to deployment ✅ Ensured smooth performance with optimized and test-driven code ✅ Strong collaboration with clients and cross-functional teams 𝗦𝗸𝗶𝗹𝗹𝘀 & 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀: ✅ JavaScript (ES6+) ✅ Nest.js, Next.js ✅ Full-Stack Web Development ✅ REST APIs ✅ Backend Architecture ✅ E2E Testing ✅ Performance Optimization ✅ Clean Code & Best Practices ✅ Agile Development ✅ Requirement Analysis & Documentation 📈 𝗪𝗵𝘆 𝗖𝗵𝗼𝗼𝘀𝗲 𝗠𝗲? ✅ 5+ years of real-world development experience ✅ Clean, scalable and maintainable code ✅ Strong communication & requirement understanding ✅ Focused on quality, performance and reliability ✅ Business-oriented development mindset 💬 Let’s collaborate to build secure, scalable and high-performing web applications that deliver real value.

I help founders, startups, and growing businesses turn web app ideas into launched, revenue-ready products. My work goes beyond simply completing development tasks. I help clients plan the right features, build the core product, launch faster, and set up the technical foundation needed to support real users, payments, admin workflows, automation, and business growth. I specialize in SaaS platforms, MVPs, dashboards, customer portals, subscription systems, internal tools, and API-driven web applications. I also help founders clean up vibe-coded apps built with tools like Lovable, Bolt, Replit, Same, v0, or Cursor and turn them into stable, production-ready products that can support real users, payments, and business growth. For live applications, I provide ongoing maintenance and product support, including bug fixes, scaling, new features, performance improvements, deployment support, integrations, and technical cleanup. A recent example is Alpha Security, a Netherlands-based security company that was running key operations through paper, spreadsheets, and manual follow-ups. I helped build a custom internal dashboard with multiple modules for security pass applications, job vacancy management, KPI tracking, and customer reviews. The system automated daily submissions and operational workflows, saving the team around 3+ hours every day. I have 6+ years of experience as a Full Stack Developer working with JavaScript and TypeScript across the full stack. My main stack includes React, Next.js, Node.js, Express, MongoDB, PostgreSQL, REST APIs, authentication systems, payment integrations, automation workflows, and production deployments. What makes my approach different is that I think about the product as a business, not just as code. Before building, I help clarify what actually needs to be launched first, which features can wait, and how the product should be structured so it can support real users, payments, admin workflows, reporting, and future growth. When the project is done, you will not just receive source code. You will get a working product, production-ready deployment, clean project structure, documentation, and a proper handover so your team or future developers can continue without confusion. If you have a SaaS idea, MVP, dashboard, customer portal, AI-generated prototype, or existing web application that needs to be launched or improved, send me a message and I’ll help you figure out the fastest practical path to get it live and working.

⏳ Saved founders and users 1000+ hours through fast-loading apps and reliable AI integrations across 7+ SaaSes & Marketplaces 🎖️Top-rated Senior Backend Developer with 7 years of experience. Focused on Multi-Tenant/Marketplace projects and AI Agents(or both) 🔧 I am best at making complex DB queries fast and AI integrations and agents that strike the balance between speed and reliability. 🫡 WHY ME: I like to help you solve your technical challenges by marrying them to business outcomes. Where most developers exist in a bubble of just writing code, I'd also like to implement solutions that would help you succeed. What you'll get: ✅ Jargon-free, NO BS, no-nonsense communication style. Talking the technical to the non-technical. ✅ Zero micro-management: I can think, plan, and propose solutions on my own, yet your input is much welcomed. Your time is better spent marketing or managing the business. ✅ Fluent English Freelancer who communicates ideas in a way that makes business sense 🙌 Industries worked with: Marketplace Style Apps(Jobs, Real Estate, etc), EdTech, FinTech, Integrations 📚 STACK: As a backend developer, I specialize in Node.js, TypeScript, MongoDB, a bit of SQL too, where needed, Trpc, and a bit of Express when needed, Zod, a bit of Next.js and React where needed, Nginx, and Digital Ocean, and a bit of AWS/GCP when needed 💯. 💪🏼 EXTRA EXTRA :) Here are more specific things I'm good at: 📌 Complex MongoDB aggregations designed for querying large amounts of data in a fast way 📌 Making MongoDB typesafe and integrating it with TypeScript and Zod 📌 Experience with nginx, DNS servers & Virtualmin 📌 Web sockets, monorepos - integrated one DB with 2 backends: the main app and our internal dashboard 📌 AI Backend integrations - utilized AI in the backend for data generation & transformation 📌 Experienced with web scraping and external rest api’s 📌 Familiarity with security vulnerabilities such as CSRF, brute force, SQL injections, etc. 📌 Experience with stronger than JWT encryption systems, such as Passetto 📌 Database Migrations: SQL to SQL or SQL to MongoDB 🏁PPS: For examples of my work, make sure to see my portfolio or my intro video, which go into much more detail 📥 JUST MESSAGE ME: Now that you're convinced I'm good at this backend thingy, shoot me a message to start working together 🤝

I'm a full-stack engineer with 4+ years of experience across Shopify, AI/LLM systems, and cloud-native SaaS. I'm the kind of person who can take a project from "here's roughly what we need" to a production system that holds up under real traffic. On the Shopify side: custom theme development (Liquid, Online Store 2.0), embedded apps built with Node.js/React, Admin and Storefront API integrations, checkout customization, Shopify Functions, subscription and metered billing apps, multi-vendor marketplace builds, headless storefronts with Hydrogen/Next.js, and Shopify Plus scaling work. Outside Shopify, most of my work is Node.js/NestJS/Express on the backend and React/Next.js on the front end, usually as microservices or multi-tenant SaaS running on GCP (Cloud Run, Vertex AI) and AWS, containerized with Docker/Kubernetes, deployed through GitHub Actions. Recent projects have held 99.9% uptime and cut API response times by 40%, mostly through Postgres indexing, query optimization, and layered Redis caching. AI is the other big piece: RAG pipelines, OpenAI (GPT-4, embeddings, function calling), Vertex AI, LangChain, and vector search with Pinecone/pgvector. That's backed by a Google Cloud Generative AI for Developers certification. I've built this into real chatbot, search, and matching products, one of which now serves 50,000+ monthly active users. For real-time features and integrations: WebSockets, Redis Pub/Sub, BullMQ job queues, Stripe (including Stripe Connect), PayPal, Twilio, and SendGrid, mostly for e-commerce, fintech, and marketplace platforms. A few recent projects: an AI chatbot SaaS platform on RAG + Kubernetes (50K+ MAU), a subscription-based wellness community platform with metered billing and real-time sessions, an AI talent-matching engine built on semantic search over pgvector, and a headless multi-vendor marketplace API with Stripe Connect payouts. If you need a Shopify store or app built properly, a SaaS platform that can actually scale, or AI/LLM features added to your product, happy to talk through what you're building.

I help individuals and businesses turn ideas into reliable, production-ready applications, from backend architecture to intuitive front-end interfaces and intelligent automation. I take on projects that other developers avoid - messy legacy codebases, unclear requirements, and "can it even be fixed?" situations - and deliver functional solutions. I also build new projects from scratch and can support teams that need an extra pair of experienced hands. My experience spans web development, AI integrations, and scalable backend systems, allowing me to deliver complete end-to-end solutions. What can I help you with: • Full-stack web application development • AI/ML integration and AI-powered features • Backend API development and system architecture • Scalable database design and optimization • Performance optimization and automation tools Technical Skills: • Languages: JavaScript, TypeScript, C, C++, Python • Tools and Technologies: Node.js, React.js, Next.js, MongoDB, PostgreSQL, Docker, Kubernetes, Redis, Postman, WebSockets, Microservices • Core Concepts: Machine Learning, Linear Algebra, Calculus, Probability & Statistics If you're looking for a developer who can combine strong engineering fundamentals with modern AI capabilities, let’s discuss your project requirements. Message me to schedule a quick call.