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Khine12/README.md

Hi, I'm Khine Zar Hein 👋

Full-Stack Developer · Open Source Contributor · CS @ Cal Poly Pomona (Expected Dec 2027)

West Covina, CA · [email protected] · LinkedIn · Portfolio


Experience

BurmaLingo — Founder & Full-Stack Developer · Apr 2026 – Present

  • Founded and launched a production English learning platform for Burmese speakers — a 6-level curriculum covering reading, writing, speaking, and listening, with GPT-4o IELTS band scoring against the student's actual writing and SM-2 spaced repetition built from scratch. Stripe billing for international users with a manual Facebook-based upgrade path for Myanmar users where Stripe isn't accessible. Launched to the Burmese diaspora community in May 2026 with paying subscribers.
  • Built an AI speaking-assessment feature: Azure AI Speech scores pronunciation (accuracy, fluency, prosody) on the learner's actual speech via a browser-to-server audio pipeline (WebM→16 kHz WAV through ffmpeg), layered with GPT-4o for grammar and topic feedback.
  • Built a listening feature with an Azure HD text-to-speech pipeline that pre-generates ~60 multi-voice, IELTS-style audio lessons once, stores them in Azure Blob Storage, and serves static MP3 — a cost-aware design that avoids per-request generation — paired with auto-graded comprehension questions (fill-blank, true/false, multiple choice) across all 6 levels.
  • Architected the full-stack system: React/TypeScript + FastAPI + PostgreSQL deployed across Vercel, Railway, and Neon with GitHub Actions CI/CD.

React TypeScript Tailwind CSS FastAPI PostgreSQL OpenAI GPT-4o Azure AI Speech Azure Blob Storage Stripe GitHub Actions

GitHub · Live


Research Assistant · Dr. Steichen's HCI Lab, Cal Poly Pomona & Santa Clara University · June 2026 – Present

  • Porting a cross-platform Flutter math-language learning app to a React/Next.js + Firebase web stack, preserving all 5 game types and 3 language-assist levels (full and on-demand translation, hover-word glossary, and text-to-speech) used with bilingual K-5 learners.
  • Contributing to an HCI research project on AI-driven, personalized multilingual math-language learning, grounded in IRB-approved pilot studies in California classroom and tutoring settings.

Tech Fellow · CodePath · May 2026 – Present

  • Mentor students in CodePath's Applied AI course — work through each course project in advance to master the material, then support live sessions by answering students' questions and tracking individual progress to personalize guidance.

Open Source

LiteLLM · 45K+ ⭐

AI gateway for routing requests across 100+ LLM providers.

PR Description Status
#26926 Fix metadata field mismatch in team callback endpoints — GET/DELETE read from wrong key, causing callbacks to always return empty 🔄 In Review

Submitty · Production university grading platform

PR Description Status
#12535 Cypress E2E tests for overridden grade banner ✅ Merged
#12562 Legal name privacy tests across roles ✅ Merged
#12607 PHP bug fix: file conflict detection assumed dot in filename, causing silent merge failures ✅ Merged
#12571 Bulk upload sample dataset expansion 🔴 Closed
#12715 Forum access control audit 🔴 Closed

Featured Projects

Inventra — Inventory & Sales Management Platform

Python FastAPI PostgreSQL React TypeScript JWT Resend APScheduler pytest GitHub Actions

  • Production REST API with automatic stock deduction, server-side negative stock guard, and email receipts via Resend after every transaction
  • APScheduler sends daily low-stock alerts automatically — no manual trigger
  • Recharts analytics dashboard visualizing revenue, cost, profit, and stock trends over time
  • Deployed across 4 cloud services with GitHub Actions CI/CD

GitHub Backend · GitHub Frontend · Live


MLH Production Engineering Hackathon — Flask REST API

Python Flask PostgreSQL Redis Nginx Docker Locust pytest GitHub Actions

  • Redis caching + Nginx load balancing across 2 Gunicorn containers — 500 concurrent users at 76 RPS, 0 failures
  • Structured JSON logging, live metrics endpoint, Discord alerting with auto-recovery detection
  • 83% pytest coverage across 19 tests · 🥇 Reliability Gold · 🥇 Scalability Gold · 🥈 Incident Response Silver

GitHub


ShiftSync — Shift Scheduling Platform (3-person team)

Next.js TypeScript Express.js PostgreSQL JWT

  • Built Messenger-style in-app messaging system with persistent PostgreSQL storage
  • Built pricing, payroll, and earnings frontend pages

GitHub · Live


Stack

Languages · Python · TypeScript · JavaScript · Java · SQL · PHP

Backend · FastAPI · Flask · Express.js · PostgreSQL · Redis · Nginx · Docker · SQLAlchemy · Alembic · APScheduler

Frontend · React · Next.js · Tailwind CSS · Recharts · Vite · Cypress

Tooling · GitHub Actions · JWT · OpenAI API · Azure AI Speech · Azure Blob Storage · Stripe · Resend · Linux


Education

Cal Poly Pomona · B.S. Computer Science + Data Science minor · GPA 3.72 · Expected Dec 2027

Los Angeles City College · A.A. · GPA 3.7 · Transferred with Honors · 2025

CodePath · Advanced Technical Interview Prep · Feb – Apr 2026


Open to SWE internship opportunities for 2026–2027.

Pinned Loading

  1. PE-Hackathon-Template-2026 PE-Hackathon-Template-2026 Public template

    Forked from MLH-Fellowship/PE-Hackathon-Template-2026

    Python 1

  2. inventra-frontend inventra-frontend Public

    React + TypeScript dashboard for Inventra — stock level charts, transaction history, revenue tracking, deployed on Vercel

    TypeScript 1

  3. burmalingo burmalingo Public

    English learning app for Burmese speakers — structured classes cost half a month's salary in Myanmar. 10-level curriculum, SM-2 algorithm, OpenAI feedback, Stripe billing. Live: burmalingo.vercel.app

    Python 1

  4. inventra inventra Public

    Production-grade inventory & sales API — FastAPI, PostgreSQL, JWT auth, email receipts via Resend, scheduled alerts, 9 pytest tests, CI/CD

    Python 1