kazhdan.dev:~

Bremen

Product engineer in Bremen. Shaping digital products end-to-end, from concept to production.

Things I build on my own

Evenings and weekends go into my own apps. Some are live, some are still finding their shape.

Coming soon to the App Store

Buzzy Jars

A calm sorting puzzle for iPhone. Pick a pot, and a swarm of bees fills it, blossom by blossom.

  • Godot 4
  • GDScript
  • iOS
Visit buzzyjars.app

On the App Store

Taime

Time tracking for shift workers. Log shifts, breaks and surcharges, photograph the schedule, export the month as a PDF.

  • Expo
  • React Native
  • 10 languages
Visit taimetrack.app
Taime screenshot 1
Taime screenshot 2

Private beta

JetPhrase

A language crash course for your next trip. Roleplay real conversations for a few weeks instead of drilling grammar tables.

  • Expo
  • Fastify
  • Claude API
Visit jetphrase.app

On hold, being reworked

Formox

A gym app for complete beginners, with Formo the fox showing the moves. On hold for now: Formox will be reworked and come back later.

  • Expo
  • React Native
  • iOS
Formox mascot, a waving fox

How I got here

  1. 2013 – 2016

    Business Informatics, B.Sc.

    University of Bremen. Half business, half computer science, and the first real taste of building software.

    • University of Bremen

  2. 2016 – 2019

    Computer Science, M.Sc.

    University of Bremen. Finished in 2019, the same year I started at neusta.

    • University of Bremen

  3. 2019

    Developer at neusta mobile solutions

    Started on a Ruby on Rails backend for a medical device maker. A few months later I shipped my first Flutter app and never really went back. Some native Android and Spring Boot along the way.

    • Rails
    • Flutter
    • Android
    • Spring Boot

  4. 2020 – 2025

    Tech lead and architect

    Led Flutter projects, sometimes as tech lead, sometimes as architect or product owner. Set up CI/CD across the company, trained colleagues new to Flutter, helped shape our internal standards. Wrote a lot of estimates and proposals, and learned what estimates leave out.

    • Architecture
    • CI/CD
    • Coaching
    • Proposals

  5. 2019 – 2025

    Client work

    Apps built via neusta mobile solutions, for clients including:

    • Kitalino
    • Hoyer
    • Q CELLS
    • OPED
    • and many more

  6. Now

    Product Engineer at Flip Technologies

    Shaping products end-to-end, from concept to production.

    • Product
    • Full stack

Writing

Notes on legacy code, API design and how teams build software.

  1. The Map Has to Keep Up With the Code
  2. How to Rescue Software You're Afraid to Touch
  3. I Was Wrong About Five-Star Developers
  4. Everyone Is a Five-Star Developer Now
  5. The API Spec Is Where Your Teams Finally Meet
Read all posts on blog.kazhdan.dev

Say hello

[email protected]