Mohammad Arkan

• Redesigned the authentication system using BetterAuth and added rate limiting, database indexing, and query optimizations to improve security and prevent abuse.
• Built and maintained a suite of Node.js microservices, increasing system efficiency and scalability by 20% across business functions.
• Designed backend services from scratch to production with robust error handling and comprehensive test coverage.
• Refactored legacy code to improve maintainability, reducing critical bugs by 25%.
• Partnered with the frontend team on API design, boosting team productivity by 15%.

A GitHub automation platform for developers — think n8n, built specifically for GitHub.

• Architected a multi-tenant automation SaaS with NestJS, PostgreSQL, RabbitMQ, and Redis.
• Built an event-driven webhook pipeline handling 17+ GitHub event types at up to 1,000 events/minute.
• Added Stripe subscriptions, plan-based access control, and 587+ automated tests.

A LeetCode-style coding platform with sandboxed execution and real-time leaderboards.

• Built an online judge platform with Node.js, TypeScript, Express, and PostgreSQL microservices.
• Ran secure code execution in Docker sandboxes with automated tests and resource isolation.
• Powered real-time leaderboards with Redis sorted sets and RabbitMQ/Kafka event pipelines.

A backend API platform for online course management — instructors author courses, students browse and stream.

• Backend API for course management, built with Bun, Hono, PostgreSQL, and Drizzle.
• Auth with email verification, MFA, and cookie-based JWT with refresh token rotation.
• Signed Cloudinary video uploads and async email delivery via RabbitMQ with retry logic.

A structured decision log for capturing and reviewing human decisions on a project.

• NestJS backend for logging decisions across projects, invites, and members.
• Type-safe data access with Prisma and Zod-validated input at every endpoint.
• Auth with email verification and password reset, queued through RabbitMQ.

A role-based finance dashboard API built for clean, maintainable, production-style code.

• Role-based access control with JWT access and refresh tokens stored in cookies.
• Advanced pagination and rate limiting with Redis and rate-limiter-flexible.
• Consistent, well-structured NestJS and Prisma API, containerized with Docker.

A CLI tool that drives a real Chromium browser from terminal commands.

• TypeScript CLI that controls a real Chromium browser via Playwright and Crawlee.
• Navigates, fills forms, and clicks by selector, text, href, or index.
• Captures page HTML, interactive elements, and screenshots straight from the terminal.

An automated system that discovers, analyzes, and posts content about startups.

• Continuously crawls the web and Product Hunt for new startup data.
• Uses Google Gemini to generate summaries, tweets, and blog posts.
• Auto-publishes to Twitter and Dev.to on a scheduled workflow loop.

An RSS feed aggregator API with scheduled background scraping.

• Go and chi-based RSS aggregator API with API-key authentication and full CRUD.
• Background workers scrape and parse followed feeds into posts on a schedule.
• Type-safe PostgreSQL queries generated with sqlc.