De Stijl Technology Network
Dec 2025 - presentFull-stack Engineer (contract). 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
Bond Software
Apr 2025 - Dec 2025Full-stack Software Engineer (contract) at an Australia-based software agency. Led frontend of a video-sharing platform from scratch, built the video upload pipeline, real-time chat via Azure Communication Services, commenting, and notifications. Owned the frontend roadmap and ran weekly stakeholder demos.
Eventx
Sep 2022 - Feb 2024Full-stack Software Engineer at Eventx.io, a Hong Kong SASS company. Tech stack: TypeScript, PostgresDB, NodeJS, ReactJS, TypeORM.
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.
Frontend Engineer · startup
2018 - 2019Got hired by a local startup as a frontend engineer. Tech stack: VueJS, NuxtJS.
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 8 min read
几个 Claude Agent SDK 回合为什么会用完 5-hour limit
从一个 Gmail Bridge 触发的 Claude Code SDK session 出发，拆解为什么表面只有几轮对话，底层却产生了 44 次 model calls、5.84M cumulative usage tokens，以及 prompt caching、tool-use round trips 和 Claude Code harness 在里面分别做了什么。
AgentClaude CodeClaude Agent SDK
Agent 11 min read
我的 personal agent 怎么管上下文：把 context 当易耗品，把记忆当资产
从一句 AGENTS.md 出发，讲我这个常驻个人 agent 是怎么分层管理记忆与上下文的：极小的常驻层 + 渐进式披露 + skill routing，让我可以放心地『做完就走、随手开新 session』。
AgentOpenCodeContext
Agent 7 min read
我为什么给 agent 加了 memory，最后又把它删了
一篇关于 OpenCode agent 长期记忆系统的复盘：从文件式 memory，到 mem0 + Qdrant，再到最终回归显式 notes。
AgentOpenCodeMemory
Thoughts 2 min read
🧠 What Should LLM-Facing Developers Know?
If building for the internet was the mainstream in the past 20 years, building for LLMs might be the future. Just like how web developers don't need to know the low-le...
Thoughts