AI4XM LTD
Apr 2024 - presentFounding Engineer at AI4XM LTD. Set up infra and coded full-stack. If you sees my job application, that means this project didn't go too well š
Hello World
I'm Haochen
My career path (if this count as a path at all): 1 year worked in hospitality -> 3 years in marketing -> 8 years in software development -> nowadays, still active in building things but trying to pivot since You Know What has entered our life :)
As a software engineer, I mainly work in full-stack JavaScript, with a soft spot for interfaces that feel clear, fast, and alive.
Experience
Eventx
Sep 2022 - Apr 2024Full-stack Software Engineer at Eventx.io, a Hong Kong SASS company. Tech stack: TypeScript, PostgresDB, NodeJS, ReactJS, TypeORM.
EPAM
Nov 2020 - Sep 2022Senior Software Engineer at EPAM, a US publicly traded company consulting for Fortune 1000. Tech stack: ReactJS, NodeJS, Typescript, GraphQL.
EPAM
Nov 2019 - Nov 2020Software Engineer at EPAM, a US publicly traded company consulting for Fortune 1000. Tech stack: ReactJS, NodeJS, Typescript, GraphQL.
Got hired by a local startup as a frontend engineer. Tech stack: VueJS, NuxtJS.
2018 - 2019Got hired by a local startup as a frontend engineer. Tech stack: VueJS, NuxtJS.
Decided to pursue programming as a career by learning full-time!
2017 - 2018Decided to pursue programming as a career by learning full-time!
Worked in marketing for a consumer tech company. I was quite interested in consumer electronics at that time. Meanwhile learning to code as a hobby.
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.
Graduated with a college degree, but didn't figure out what I want to do. I guess traditional education and me failed each other.
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
OpenCode Agent Memory ā Design Note
Design and implementation note for the long-term memory feature of a personal OpenCode agent: file-and-protocol storage, eager index recall, auto-capture, and LLM compaction.
AgentOpenCodeLLM
DSA 1 min read
MinHeap
A min-heap is a binary tree where each node is less than or equal to its children. The root of the tree is the smallest element in the heap. Since it is always a full...
DSAHeap
DSA 1 min read
Backtracking š¤Æ
https://leetcode.com/problems/subsets/ Given an integer array nums of unique elements, return all possible subsets (the power set). The solution set must not contain d...
DSABacktracking
DSA 2 min read
Quadratic vs exponential vs factorials
Quadratic Complexity - O(nĀ²) Quadratic complexity means that the runtime grows proportionally to the square of the input size. For example: - If n = 10, operations ā 1...
DSA