About

riml / Daiki Takahashi

I write frontends for the web.

I'm a senior engineer and manager at a listed company in Tokyo, where I'm building up the frontend organization and its design system.

In my own time I build a design system, riml-ds, and the products that sit on top of it.

Current role

About as much as fits on a business card.

Company: OPTiM Corporation
Role: Senior engineer (manager)
Based in: Tokyo
What I do: Building up the frontend organization
Designing and building the design system
Frontend architecture
Team management and mentoring

Not looking to change jobs. Open to side work.

Away from the screen.

Rhythm games: Rainbow rate in CHUNITHM and maimai. Made it to the second qualifier in Sendai at the 2nd Garupa Cup. Peaked at 5th on the BeatTube player ranking.
Video: VTuber streams and anime. My favorite is That Time I Got Reincarnated as a Slime.
Making things: An Excellence Award at Connect2019, and the grand prize and a company prize at a school hackathon.

Linked where the slides or an event report are public.

From the company blog and my own posts.

No percentage bars. Sorted by how often I actually reach for them.

Every day: The first thing I open, at work and at home.
TypeScript
React
Next.js
CSS
HTML
Often: I reach for these when a job needs them.
Lit / Web Components
Vue.js / Nuxt
Astro
TanStack Start
Bun
Node.js
Cloudflare Workers / D1
Storybook
Playwright
GitHub Actions
Tried: Far enough to get something running.
Rust
Go
Python
Swift
C#
Dart / Flutter
Laravel / PHP
Nix