Andy Koh
Tech Lead with 5+ years of experience building consumer applications and leading cross-functional teams. Cornell graduate with background in finance, data analysis, and software engineering.
Technical Skills
Frontend
- React/Next.js
- Expo iOS/Android (React Native)
- TypeScript/JavaScript
- Tailwind/SCSS
Backend
- Python/Django/FastAPI
- Node.js
- Go Lang
- Ruby on Rails
- GraphQL/Apollo
DevOps & AI
- AWS
- Docker/Terraform
- OpenAI APIs
- Hugging Face
- Langchain/Langfuse
- LMStudio
Database
- PostgreSQL
- MongoDB
- Supabase
- Qdrant (Vector Search)
Professional Experience
Experienced software engineer across startups and major tech companies. Currently a Founding Engineer at Onestay, building the core tech stack from the ground up using React Native, FastAPI, and Supabase. Previously served as Tech Lead at VTS, where I led application performance optimizations achieving 30%+ reduction in time-to-interaction. Strong track record in full-stack development, API integrations, and financial systems automation. Led teams through major technical initiatives including post-M&A data migrations and enterprise-scale platform launches. Early career focused on data analysis and operational efficiency at Amazon, delivering $1.5M+ in cost savings through automation and ML projects. Core expertise: React/React Native, Python/Go backends, AWS cloud architecture, project/team leadership, and performance optimization. Proven ability as individual contributor to leadership roles across diverse industries including real estate tech, fintech, and e-commerce.