De Stijl Technology Network
Feb 2025 - presentFull-stack Engineer (contract), remote. 80% backend, 20% frontend. Tech stack: AWS, DynamoDB, NodeJS, React Native.
Hello World
I'm Haochen
I build full-stack products with TypeScript, moving between product ideas, backend systems, data models, and frontend interfaces.
I'm especially interested in async architecture on the backend, and lately I've also been exploring AI agents and agent memory systems. I have a soft spot for UI that feels lively, clear, and easy to use.
Experience
Personal goal pursuit
Apr 2024 - Feb 2025Career break — personal goal pursuit.
Eventx
Sep 2022 - Apr 2024Full-stack Software Engineer at Eventx.io, a Hong Kong SASS company. Tech stack: TypeScript, PostgresDB, NodeJS, ReactJS, TypeORM, KOA, BullMQ.
EPAM
May 2021 - Sep 2022Senior Software Engineer at EPAM, a US publicly traded company consulting for Fortune 1000. Tech stack: ReactJS, NodeJS, Typescript, GraphQL.
EPAM
Nov 2019 - Apr 2021Software Engineer at EPAM, a US publicly traded company consulting for Fortune 1000. Tech stack: ReactJS, NodeJS, Typescript, GraphQL.
Fagougou
Nov 2018 - Nov 2019Software Engineer at a local startup. Developed and maintained the client-facing Nuxt.js project and an internal workflow platform; unified the separate mobile & desktop Nuxt.js projects into one for better maintainability. Tech stack: Vue, Nuxt, Node, Express, Webpack, MongoDB.
Learning to code full-time
2017 - 2018Decided to pursue programming as a career by learning full-time!
Marketing · consumer tech
2014 - 2017Worked in marketing for a consumer tech company. I was quite interested in consumer electronics at that time. Meanwhile learning to code as a hobby.
College
2008 - 2012Graduated with a college degree, but didn't figure out what I want to do. I guess traditional education and me failed each other.
Recent Writing
Latest notes and experiments
Agent 6 min read
What I've Learned From Using Agents: From TUI to Workspace-as-Home
Starting from NanoClaw: making agent-workspace the agent's home, taking it off my machine with opencode serve, layering memory across notes / user.md / todos.md, and the two automatic-memory approaches I tried before settling on one.
AgentOpenCodeClaude Code
Agent 5 min read
Why a Few Claude Agent SDK Turns Used Up My 5-Hour Limit
Starting from a Gmail Bridge triggered Claude Code SDK session, this note breaks down how a few visible turns produced 44 model calls, 5.84M cumulative usage tokens, and a depleted 5-hour limit.
AgentClaude CodeClaude Agent SDK
Agent 9 min read
How My Personal Agent Handles Context: Treat Context as Disposable, Memory as an Asset
Starting from a single line in AGENTS.md, here's how my always-on personal agent layers memory and context: a tiny always-loaded core, progressive disclosure, and skill routing — so I can finish a task, close the session, and start a fresh one without a second thought.
AgentOpenCodeContext
Agent 6 min read
Why I Added Memory to My Agent and Then Removed It
An engineering postmortem on building, tightening, and ultimately disabling long-term memory in my OpenCode agent.
AgentOpenCodeMemory