Hassan A.

Need a fast, reliable React/Next.js application, landing page, or AI-powered workflow? I help businesses build, improve, and troubleshoot high-performance web products that are responsive, maintainable, and ready to scale. I’m a Senior Front-End/Full-Stack Developer with 8+ years of experience working with React, Next.js, TypeScript, Node.js, REST APIs, GraphQL, Supabase, PostgreSQL, and AWS. Selected results: • Increased mobile visits by 300%+ by implementing AMP • Improved overall website performance by 60% • Increased user engagement by up to 43% • Reduced manual admin work by 35% • Built 30+ AWS Lambda functions for automation and data integrations • Achieved 70%+ test coverage on production React applications I can help you with: • React and Next.js application development • Responsive landing pages and multi-step forms • SaaS dashboards and internal tools • AI/LLM and OpenAI-compatible API integrations • REST APIs, GraphQL, webhooks, and third-party integrations • Performance optimization and Core Web Vitals • Debugging and improving existing codebases • Automated testing with Jest, Vitest, RTL, and Cypress I’ve also developed an AI interview platform involving structured LLM responses, prompt workflows, session recovery, idempotent retries, and real-time voice/avatar integrations. If you need someone who can understand an existing system, find the real problem, and deliver a maintainable solution, let’s discuss your project.