june@devfolio:~/resume

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June Park

Senior Full-Stack Engineer Berlin, Germany

Sync engines, collaborative editors, and the boring reliability work in between. Explore ten years of it from the terminal — or just scroll, the whole résumé is plain HTML underneath.

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Devfolio — an interactive terminal résumé.

June Park — Senior Full-Stack Engineer · Berlin, Germany

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About

June Park — senior full-stack engineer, Berlin, Germany

june-park [--hire] [--freelance] [--coffee-chat]

I build web software that stays fast on hotel Wi-Fi and legible six months later. Ten years in, my favourite problems still live where the browser meets the backend: sync engines, collaborative editors, and the boring reliability work that makes products feel expensive.

Currently at Fernweh Labs, where I lead the web side of a collaborative trip-planning editor used by around 300,000 travellers a month. Before that I spent three years keeping point-of-sale software selling through dropped connections at Kassenwerk, and three more at Studio Brandt & Co shipping agency work fast enough to survive any audit.

Outside work hours I maintain a small stable of open-source tools — a status-page generator, a Postgres migration linter — and answer more U-Bahn timetable questions than any hobby project justifies. Open to senior full-stack or platform roles in Berlin, or remote across the EU.

Experience

Senior Full-Stack Engineer

2022 – present

Fernweh Labs Berlin

  • Led the rebuild of the collaborative trip editor from a jQuery monolith to SvelteKit and TypeScript; p75 interaction latency dropped from 480 ms to 90 ms.
  • Designed the itinerary sync service (Fastify, PostgreSQL, Redis) that now carries 40,000 concurrent editing sessions in peak season without paging anyone.
  • Introduced contract tests and preview deployments; releases went from fortnightly to daily and rollbacks fell by two thirds.
  • Mentor two engineers and run the guild that owns the web performance budget.

Full-Stack Engineer

2019 – 2022

Kassenwerk Berlin

  • Built the offline-first order queue for a point-of-sale web app — IndexedDB plus background sync — so cafés kept selling through network drops.
  • Shipped the payout reconciliation dashboard used by 1,200 merchants a day; support tickets about missing payouts fell 35%.
  • Replaced REST polling with server-sent events on live order boards, roughly halving API traffic.

Frontend Developer

2016 – 2019

Studio Brandt & Co Hamburg

  • Delivered twenty-plus marketing and e-commerce sites; owned performance budgets (LCP under 2 s on throttled 3G) and accessibility sign-off.
  • Built the studio's internal component library, reused across a dozen client projects.

Projects

tidewatch

Static status-page generator: point it at your health-check endpoints and it renders uptime history as a fast, dependency-free page.

  • Go
  • SQLite
  • SvelteKit

sourcedemo

pgline

CI linter for Postgres migrations that flags locking foot-guns — table rewrites, unindexed foreign keys — before they reach production.

  • TypeScript
  • Node.js

sourcedocs

shelfmark

Self-hosted read-it-later app with full-text search and EPUB export; the whole library syncs as a single SQLite file.

  • Node.js
  • Fastify
  • Svelte
  • SQLite

source

ubahn-live

Terminal dashboard for Berlin U-Bahn departures, because leaving the flat ninety seconds earlier matters.

  • Go
  • Bubble Tea

source

Skills

languages
  • TypeScript
  • JavaScript
  • Go
  • SQL
  • Bash
frontend
  • Svelte & SvelteKit
  • React
  • HTML & modern CSS
  • Accessibility (WCAG 2.2)
  • Performance profiling
backend
  • Node.js
  • Fastify
  • PostgreSQL
  • Redis
  • SQLite
  • REST & server-sent events
tooling
  • Docker
  • GitHub Actions
  • Terraform
  • Grafana
  • Playwright
  • Vitest

Education

B.Sc. Computer Science

2012 – 2016

Technische Universität Berlin

Thesis: CRDT-based collaborative editing over unreliable connections.

Self-directed programming retreat

2018

Recurse Center, New York

Twelve weeks of compilers, generative ASCII art, and pair programming.

Contact

The inbox is open — for roles, contract work, or U-Bahn timetable questions.

Berlin, Germany

FAQ

Can I use this template for my own résumé?

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Does the site work without JavaScript?

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How do I add a new terminal command?

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Will recruiters actually use a terminal?

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