Senior Full-Stack Engineer with 6+ years of experience building scalable SaaS platforms, AI-powered tools, and high-performance web applications. Specialist in Next.js, React, TypeScript, Node.js, and MongoDB.
- 🏆 Fiverr Top Rated Seller with consistent 5-star reviews
- 📦 250+ applications delivered for clients across the USA, UK, Europe, and Asia (15+ countries)
- ⚡ Improved production app performance by 30–50% through code splitting, lazy loading, and image optimization
- 🤖 Built AI-driven systems using Google Gemini AI, OpenAI, and LangChain
- 🌍 Based in Dhaka, Bangladesh
- 🤝 Open to freelance projects and collaborations
Frontend
Backend & Database
AI / DevOps / Testing
| Project | Description | Stack |
|---|---|---|
| AI Resume Analyzer & ATS Optimizer | ATS scoring engine + AI rewrite system with PDF/DOCX parsing and skill-gap analysis. 500+ beta users in the first 2 weeks. | Next.js · Node.js · MongoDB · Gemini AI · Tailwind CSS |
| FinanceAI | AI financial advisor and expense tracker with smart budgeting alerts and an analytics dashboard (trends, categories, forecasts). | Next.js · MongoDB · Recharts · Gemini AI · JWT |
| Apollo Mart | Full-stack e-commerce platform: cart, checkout, wishlist, admin panel, order tracking, AI assistant. Multi-currency, multi-language, PWA, Lighthouse 95+. | Next.js · Redux Toolkit · TypeScript · Node.js · Express · MongoDB |
- Senior Full-Stack Developer (Freelance), Fiverr · Jun 2020 – Present Delivered 250+ web and mobile apps; 98% client satisfaction rate.
- Senior Frontend Developer, Lumi Enterprises Corp · Jan 2025 – Jan 2026 Enterprise React/Next.js apps for 50,000+ users; Docker + AWS EC2 + GitHub Actions CI/CD; Vitest with 85%+ coverage on critical modules.
- React / React Native Developer, Elevow S.A · Jan 2022 – Mar 2022
- Senior Frontend Developer, BeWeddy (USA) · Jul 2021 – Dec 2021
**Let's build something great together.** 📩 [sonjoybarmon19@gmail.com](mailto:sonjoybarmon19@gmail.com)