Open to opportunities

William He

@williamhe

Message

AI Full-Stack Software Engineer building end-to-end, production AI products and scalable web systems.

United States

Message

What I'm looking for

I’m looking for a product-focused team where I can build end-to-end AI features—retrieval, grounded generation, and agent workflows—while shipping scalable web systems. I want ownership, fast iteration, and strong collaboration across product and operations.

I’m an AI-driven full-stack software engineer who evolved from backend development into product-focused AI systems. I turn business needs into reliable, production-ready software by building across backend, frontend, and AI-enabled workflows.

In my most recent work, I built an internal AI-enabled support platform with React-based agent UI and FastAPI backend APIs, including retrieval over PostgreSQL embeddings (pgvector) and grounded answer generation. I orchestrated multi-step agent workflows using LangGraph with MCP-based tool integrations to route support requests through retrieval, tool calls, answer generation, and fallback handling.

I also develop supporting metadata and enrichment tooling, leveraging React and FastAPI with PostgreSQL + pgvector for semantic similarity and AI-assisted enrichment pipelines. I containerize and deploy on Kubernetes (AWS), automate CI/CD for testing and rollouts, and partner with operations and stakeholders to improve prompt flows, retrieval quality, traceability, and resolution speed.

Experience

Work history, roles, and key accomplishments

Current

AI Full-Stack Software Engineer

Current

Philo

Aug 2022 - Present (3 years 8 months)

Built an internal AI-enabled support platform for billing, playback, and device troubleshooting, combining a React agent UI with FastAPI orchestration and MCP-based tool integrations. Implemented pgvector semantic retrieval and LangGraph multi-step workflows, then containerized services with Docker and deployed to AWS Kubernetes with automated CI/CD to improve reliability for support teams.

React fastAPI PostgreSQL Pgvector LangGraph Model Context Protocol (MCP)Kubernetes Docker CI CD

Frontend Developer (AI Analytics)

Test.ai

Sep 2018 - May 2022 (3 years 8 months)

Led UI design for an AI analytics testing automation platform using React and Redux, supporting multiple concurrent projects and deadline delivery. Revamped the build system (webpack v1 to v3), reducing gzipped bundle size by 45KB and improving build times by 20%, and implemented query-parameter-driven views that reduced network calls by 75% and improved rendering speeds by 50%.

React Javascript (ES6)Redux Webpack Performance Optimization Responsive UI Browser compatibility

Software Engineer (Web Security)

MindIt Technologies

Jan 2018 - Aug 2018 (7 months)

Spearheaded front-end development for an enterprise real estate application, improving security and user experience. Implemented login throttling and session timeout behavior for JWT/cookie validation, added route authorization via React components, integrated OAuth-based internal emailing, and built performance improvements and data ingestion features including PDF-to-JSON parsing for search.

React JWT OAuth WebSockets Redux PDF Parsing Google Directions API Performance Optimization

Software Engineer (React Debugging)

React Sight

Oct 2017 - Jan 2018 (3 months)

Developed React Sight functionality to visualize and debug React component hierarchies in real time. Used D3 to render and diff a component tree, implemented a persistent bridge between the app and a Chrome dev tool using content scripts and postMessage, and optimized performance by throttling setState and limiting updates to changed virtual DOM data.

React D3.Js Virtual DOM Diffing Performance Optimization SetState Throttling