Shipping high-quality product at AI-augmented speed.

Data analyst, then engineer. I build what matters.

6.1K → 19.7K downloads in 3 months · IPO'd · 30k → 200k accounts

Stack & Methodology.

METHODOLOGY

AI-augmented speed, no compromise on detail. Heavy testing. The bar doesn't move just because the tools got faster.

Built the discipline as a data analyst, pivoted to engineering in 2019, well before the AI wave.

FRONTEND / MOBILE

React · Next.js · React Native · Expo · TypeScript

BACKEND

Node.js · NestJS

Off legacy Angular/Vue/PHP.

RECENTLY SHIPPED

Crawler V2, Jan 2026  ·  Reports / happy-hour  ·  Push & SMS re-engagement loops

TOOLING

GitHub · Cursor · Claude Code · Figma · Docker · AWS · GCP

Work.

OSMOS · CRAWLER V2

iOS Android

Cross-platform rewrite. Four weeks.

Shipped Jan 27 2026.

6.1K → 19.7K downloads in 3 months · 4.9★ App Store · rating recovery on Play

Read full story
Circle Internal Financial Software Engineer · 3 yrs · IPO 2025

Built core features in Circle's developer console (API key management, webhooks, billing views, MFA flows) in React, TypeScript, Next.js, GraphQL.

Self-serve API key system reduced CS tickets 30%. Led the migration from Checkout to Stripe, lifting payment success ~50%. Cut E2E test failures 30%. Mentored two juniors who shipped Circle's first publicly hosted open-source sample app.

Was there for the June 2025 IPO (NYSE: CRCL).

iTrustCapital Software Engineer · 1 yr · Unicorn · 30k → 200k accounts

Second frontend engineer. Built the cross-platform web/mobile app and internal CRM from zero on React Native, TypeScript, Recoil, GraphQL, Expo, Reanimated, and RN-for-Web.

Helped grow the company from 30k → 200k accounts. Owned the Funding Tracker (cut inbound support ~10%) and led frontend on conditional transactions, which moved 15% of total transaction volume within three months of release.

Reached unicorn status during my tenure (Series A, ~$120M).

EARLIER

Smartspace AI 2020–21 Vue/Laravel/Docker stack, 40+ time-series visualizations, microservices on Lambda.
Carpe Data 2018–19 Data Analyst → 27M-record SQL analyses, automation that saved 240 FTE hours/month.

My Story.

I’m Hyundoh Kim. I build products fast, with high standards for detail.

I started as a data analyst. I got tired of being downstream of every decision, tired of measuring what other people built. I learned to ship instead.

Five years in, I’ve launched everything from cross-platform mobile rebuilds to the developer console at a company that IPO’d. The detail bar hasn’t moved. AI hasn’t changed what I care about; it’s just made me faster at it.

The Vault.

Older writing from when I was learning Laravel. Kept for posterity.

Let's talk.

Have a project in mind, want to compare notes, or just want to say hi? Drop a message.