
MD SAIFULLAH
Software Developer
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Full-Stack Developer – E-Commerce Platform
eCom IT • Freelance
Dec 2025 - Apr 2026 • 4 mos
Developed and delivered a production-ready full-stack e-commerce platform for a retail business specializing in premium apparel and accessories. I was responsible for building the backend architecture, integrating payment services, implementing business-critical functionalities, and deploying the application. Key Contributions: Developed scalable backend REST APIs using Java and Spring Boot. Integrated Razorpay Payment Gateway, including checkout sessions and payment verification workflows. Implemented atomic inventory management and double-order prevention mechanisms to maintain transaction consistency. Integrated Redis caching to optimize database operations and improve product catalog loading performance. Automated transactional emails for user verification, order processing, shipping, and delivery notifications using Brevo and Resend APIs. Developed a responsive frontend using Next.js. Deployed backend services on Render and hosted the frontend on Vercel. Technologies: Java, Spring Boot, Next.js, Redis, Razorpay, Brevo, Resend, REST APIs, Render, Vercel.