MOHAMMAD ARKAN

Summary

With over 2 years of experience, I build scalable backend systems using Node.js and TypeScript. I design and deploy microservices and event-driven systems, improving system performance and reliability by up to 30% through database optimization, efficient architectures, and automation.

Skills

Experience

• Redesigned the authentication system using BetterAuth, improving security and maintainability; implemented rate limiting, database indexing, and query optimizations to enhance performance and prevent abuse.
• Developed and maintained a suite of Node.js microservices, increasing system efficiency and scalability by 20% across business functions.
• Designed and implemented backend services from scratch to production using best practices, robust error handling, and comprehensive test coverage.
• Reviewed and refactored legacy code to improve maintainability and software quality, reducing critical bugs by 25%.
• Collaborated with the frontend team to design and implement APIs, ensuring smooth integration and reliable communication between services, boosting team productivity by 15%.
• Identified and resolved hidden data patterns, contributing to improved system architecture and performance.

Projects

• Architected and developed a multi-tenant GitHub automation SaaS using Node.js, TypeScript, NestJS, PostgreSQL, RabbitMQ, and Redis.
• Built an event-driven webhook processing system supporting 17+ GitHub event types through asynchronous RabbitMQ workers, handling up to 1,000 events per minute.
• Implemented Stripe subscription management, plan-based access control, Redis rate limiting, webhook verification, and secure tenant isolation.
• Designed and deployed an automated CI/CD pipeline using GitHub Actions, Docker and GCP with health checks and automatic rollback support.
• Wrote 587+ unit and end-to-end tests using Jest and Supertest, improving platform reliability and maintainability.

• Built a LeetCode-style online judge platform using Node.js, TypeScript, Express, and PostgreSQL with a microservices architecture.
• Implemented secure code execution using Docker sandboxes with automated tests, timeouts, and resource isolation.
• Designed an event-driven system using RabbitMQ, Kafka, and Debezium (CDC) to process submissions and update results asynchronously.
• Developed real-time contest leaderboards using Redis sorted sets, ensuring fast ranking updates with persistent storage in PostgreSQL.