Hello, I'm Khine Zar Hein.

🤖 LiteLLM — Open Source Contributor

Python • REST APIs • LLM Integration

LiteLLM is an open-source AI gateway used by thousands of companies to route requests across 100+ LLM providers. It has 45K+ GitHub stars.

• Fixed a metadata field mismatch in team callback endpoints where GET/DELETE operations read from the wrong nested key, causing callbacks to always return empty regardless of configuration

Repository | PR #26926

🛠️ Submitty — Open Source Contributor

Cypress • PHP • JavaScript • GitHub Actions • CI Debugging

Submitty is a production course management and grading platform used by universities. I've been contributing since March 2026.

• Contributed 4 pull requests across grading, privacy, and access control systems to a production university platform used by thousands of students and instructors
• Wrote Cypress E2E tests validating privacy protections and grading workflows across student, TA, and instructor roles
• Fixed a PHP bug in SubmissionController.php where bulk upload conflict detection assumed filenames always contain a dot, causing silent merge failures
• Debugged CI failures, resolved flaky tests, and addressed reviewer feedback across 3+ review cycles
• Filed bug reports identifying CI pipeline failures on main, leading to maintainer fixes
• Reviewed pull requests by other contributors, identifying linting errors and accessibility issues

Repository | PR #12535 | PR #12562 | PR #12571 | PR #12607 |

🌏 BurmaLingo — English Learning Web App for Burmese Speakers — In Development

React • TypeScript • Tailwind CSS • FastAPI • PostgreSQL • MVC • JWT • Stripe • OpenAI API • GitHub Actions

In Myanmar, structured English classes from a well-known teacher cost roughly half a month's basic salary — for a seat in a 100-person Zoom class where the teacher doesn't know your name. Cheaper video courses cover only one level with no structured progression. BurmaLingo is the affordable structured alternative — built by a Burmese immigrant who lived this problem.

• Integrated OpenAI GPT-4o-mini for AI writing and translation feedback — server-side rate limiting enforces free vs paid access per user tier
• Built SM-2 spaced repetition algorithm from scratch for vocabulary scheduling across a 10-level curriculum (Beginner I through IELTS Practice)
• Architected FastAPI backend with MVC structure, JWT auth, PostgreSQL, and Stripe webhook integration for free/pro tier access control — rate limits enforced server-side only
• CI/CD pipeline with GitHub Actions running pytest and TypeScript build checks on every push to main; frontend deployed on Vercel

GitHub | Live (Landing Page)

📦 Inventra — Full-Stack Inventory & Sales Management Platform

Python • FastAPI • PostgreSQL • React • TypeScript • JWT • Resend • APScheduler • pytest • GitHub Actions

A production-grade inventory and sales management platform with a FastAPI backend, React/TypeScript frontend, and full deployment across 4 cloud services.

• Built a production REST API with FastAPI and PostgreSQL — JWT authentication, automatic stock deduction after each sale, and server-side negative stock guard preventing inventory from going below zero
• Integrated Resend API to fire email receipts automatically after every transaction via custom domain; added APScheduler to email sellers daily about low-stock and expiring items without any manual trigger
• Designed analytics endpoint aggregating revenue, cost, and profit per transaction; built React/TypeScript dashboard with Recharts visualizing stock levels and profit trends over time
• Deployed across 4 cloud services — FastAPI on Render, PostgreSQL on Neon, React frontend on Vercel — with GitHub Actions CI/CD running 9 pytest tests on every push to main

GitHub | Live Demo

⚙️ MLH Production Engineering Hackathon — Flask REST API

Python • Flask • PostgreSQL • Redis • Nginx • Docker • Locust • pytest • GitHub Actions

Built a production-grade REST API during the MLH Production Engineering Hackathon, completing the Reliability, Scalability, and Incident Response quest tracks.

• Implemented Redis caching and Nginx load balancing across 2 Gunicorn containers — sustained 500 concurrent users at 76 RPS with 0 failures under Locust load testing
• Added structured JSON logging, live metrics endpoint, and Discord alerting with auto-recovery detection
• Achieved 83% pytest coverage across 19 tests
• Set up GitHub Actions CI/CD pipeline with Docker Compose orchestration and auto-restart policy

GitHub

📅 ShiftSync — Full-Stack Shift Scheduling Platform

Next.js (TypeScript) • Express.js (TypeScript) • PostgreSQL • JWT Auth

A collaborative team project building a web-based shift scheduling platform for small and medium-sized businesses. My primary contributions:

• Designed and implemented a Messenger-style in-app messaging system with persistent PostgreSQL storage
• Fixed a bug where managers weren't automatically added to team membership on team creation
• Fixed authentication state management across the frontend navbar

Key features include manager shift assignment, employee swap requests, role-based access control, and real-time messaging. Deployed on Vercel and Render.

GitHub | Live Demo