Haochen Xu

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.

Read the posts Open the lab

Experience

AI4XM LTD

Apr 2024 - present

Founding 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 😅

Eventx

Sep 2022 - Apr 2024

Full-stack Software Engineer at Eventx.io, a Hong Kong SASS company. Tech stack: TypeScript, PostgresDB, NodeJS, ReactJS, TypeORM.

EPAM

Nov 2020 - Sep 2022

Senior Software Engineer at EPAM, a US publicly traded company consulting for Fortune 1000. Tech stack: ReactJS, NodeJS, Typescript, GraphQL.

EPAM

Nov 2019 - Nov 2020

Software 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 - 2019

Got 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 - 2018

Decided 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 - 2017

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.

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 - 2012

Graduated 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

Browse archive
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 🤯

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(n²) Quadratic complexity means that the runtime grows proportionally to the square of the input size. For example: - If n = 10, operations ≈ 1...

DSA