I'm Md. Abdur Razzak Rakib, a Backend-Focused Full Stack Developer from Chittagong, Bangladesh.
I specialize in building scalable, maintainable, and high-performance web applications using modern JavaScript technologies. My passion lies in designing backend systems that are reliable, easy to maintain, and capable of handling real-world traffic without compromising performance.
Rather than simply developing features, I focus on solving business problems through clean architecture, optimized APIs, and user-centered solutions. I believe great software is not only functional but also sustainable, secure, and built to grow with the needs of its users.
I enjoy learning new technologies, improving system performance, and building products that deliver a seamless experience for both users and developers.
Skills
Backend Developer
Current PositionJan 2025 – Present
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Architected and delivered REST API endpoints across authentication, booking, and admin workflows using Express.js and TypeScript, serving as the sole backend interface for the platform.
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Implemented JWT + Google OAuth authentication with token refresh rotation and rate limiting eliminating credential-stuffing exposure and reducing unauthorized access attempts to near zero.
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▸ Engineered 3-tier RBAC (User / Artist / Admin) with route-level middleware guards, enabling granular permission logic and reducing privilege-escalation risk across all protected resources.
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Replaced polling-based refresh with Socket.io event-driven architecture, eliminating 200 unnecessary HTTP requests per active session and delivering booking status updates in under 150ms.
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Profiled and optimized critical MongoDB queries with compound indexing and projections, reducing average API response time from ~650ms to ~45ms on high-traffic booking endpoints.
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Integrated Stripe Billing API with cryptographically verified webhook handlers covering subscription creation, upgrades, downgrades, and failed payment retries enabling fully automated billing lifecycle with zero manual intervention.
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Deployed and managed application on Linux VPS using PM2 (cluster mode) and Nginx reverse proxy structured Winston logging and graceful error recovery.
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Standardized API error responses with a centralized Express error middleware and typed error classes, reducing unhandled exception incidents and cutting average debugging time
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