drkn.dev

Work

Portfolio

Selected things I have built and shipped.

  • Localesy

    2023–2026

    Translation management for fast-moving teams: sync translations across projects and codebases, automate localization and ship in minutes. I founded it and built the product.

    • Localization
    • AI
    • Agentic workflows
    • SaaS
    • Developer tools
    VisitCLI on npm

  • Crypto Company · United States

    2025–2026

    Lead engineer on a crypto company's customer dashboard and the internal admin panel behind it. Built the tRPC and BigQuery data layer, authorization, reporting and the release pipeline, plus a Promptfoo evaluation harness for the team's coding-agent setup.

    • TypeScript
    • Next.js
    • tRPC
    • Drizzle
    • Postgres
    • BigQuery

  • Open-source crypto swap widget and UI kit

    2025–2026

    Built an embeddable swap widget and its React UI kit for an open-source crypto SDK: token selection, wallet connection, quote preview, route selection and swap confirmation.

    • TypeScript
    • React
    • Tailwind CSS
    • Bun
    • Next.js
    • Vite

  • React Native Paper - Material You theming

    2021–2023

    While at Callstack, contributed to its Material Design library for React Native: Material You (MD3) theming, theme types and a theme switcher, surface shadows, AnimatedFAB improvements, and the documentation migration to Docusaurus. 15 merged pull requests.

    • React Native
    • TypeScript
    • Material Design 3
    • Docusaurus
    Source

  • NDA - connected car mobile app

    2021–2023

    At Callstack, worked on a React Native app that controls real-world car functions, built on module federation. Set up the project documentation with Docusaurus and hosted Redux Toolkit workshops for the client's development team.

    • React Native
    • TypeScript
    • Module Federation
    • Redux Toolkit
    • Docusaurus

  • NDA - sports betting app performance

    2021–2023

    At Callstack, led a team bringing native-like list performance to the brownfield React Native app of a sports betting unicorn, where every list is dynamic content. A long run of performance improvements and codebase quality tweaks along the way.

    • React Native
    • TypeScript
    • Performance
    • Brownfield

  • NDA - performance and code quality audit

    2021–2023

    At Callstack, led the team behind a performance and code quality report for a client's React Native app: 60+ actionable items with measurable impact, followed by delivery of the improvements.

    • React Native
    • TypeScript
    • Performance
    • App architecture

  • Open-source contributions

    2022–2026

    A dynamic theme type for the useTheme hook in Callstack's react-theme-provider and a documentation fix for Supabase, next to the larger crypto SDK (2025 and 2026) and React Native Paper contributions listed above.

    • TypeScript
    • React
    Source

Other projects

Side projects and experiments, mostly open source.

  • Lunction

    2021

    Open-source meal planner: add meals, drag and drop them onto a calendar and see only the information that matters. An alternative to overcomplicated apps.

    • TypeScript
    • React
    Source

  • Recipe Book

    2020–2026

    A very simple recipe application that stores everything in the browser with IndexedDB (Dexie), written in Ember with TypeScript and Tailwind.

    • Ember.js
    • TypeScript
    • IndexedDB
    • Tailwind CSS
    Source

  • Crypto Space

    2020

    React and RxJS app with animated live graphs, and a proof of concept for responsive standalone components driven by ResizeObserver.

    • React
    • RxJS
    • JavaScript
    Source

  • Fast Food

    2019–2020

    Food ordering side project: a Phoenix backend with GraphQL support, plus frontend work on JSON:API and REST integration and dark-mode themes.

    • Elixir
    • Phoenix
    • GraphQL
    • JavaScript
    Source