Services

Plan digital products clearly and deliver them reliably.

I help teams turn product ideas into reliable digital outcomes through focused execution, pragmatic technology choices, and a delivery setup that works under real deadlines and constraints.

Whether you are launching, stabilizing, or untangling a critical phase, I connect product and engineering, reduce complexity, and create visible progress you can track.

Capabilities

What I do

Frontend

  • HTML
  • CSS
  • SASS
  • JavaScript
  • TypeScript
  • React
  • React Native
  • Redux
  • Astro
  • SwiftUI

Backend

  • Ruby On Rails
  • Ruby
  • Golang
  • Swift
  • GraphQL
  • JSONAPI
  • Node.js
  • Python
  • spaCy
  • Django
  • Docker
  • AWS

Databases

  • MySQL
  • Postgres
  • Redis
  • ElasticSearch

Third Parties

  • GitHub
  • Stripe
  • Salesforce
  • Contentful
  • Recurly
  • RevenueCat
  • Facebook Ads
  • Google Ads
  • Zapier
  • Braze
  • Strapi
  • Mailchimp
  • Claude
  • Gemini
  • OpenAI
  • Metabase

Methods

  • Git
  • CI/CD
  • TDD
  • SCRUM
  • E2E testing (Playwright)
  • Security & Compliance
  • ISO:IEC 27001
  • Design Thinking
  • Rapid Prototyping
  • Lean Startup
  • Business Model Canvas

Where I came from

Experience

  1. Tech Lead, Coding Coach, Developer

    2023 - today

    Self employed

  9. Web Developer

    2006 - 2008

    Advertising Agency

  10. Designer, Developer

    2006 - 2008

    Self employed

Selected case examples

  • GRID App PropTech / NLP 2025

    For the PropTech startup gridapp.ai I implemented a custom NLP solution based on spaCy to turn domain-specific requirements into a reliable AI application.

    GRID App

    • Python
    • spaCy
    • NLP
    • Custom AI
  • Emilia PropTech / Mobile App 2025

    For the PropTech startup emilia.app I worked on a cross-platform React Native app with a Rails-based GraphQL API.

    Emilia

    • React Native
    • Ruby On Rails
    • GraphQL
  • Balloon Meditation app / ISO 27001 2024

    For Balloon I supported the ISO 27001 certification as both advisor and implementer, from translating requirements into working processes to embedding them in the team day to day.

    Balloon

    • ISO 27001
    • Security
    • Compliance
    • Implementation
  • Chefkoch PLUS Food platform / Subscription 2022

    I was responsible for the whole IT department during development of a new B2C subscription-based business model for the largest European user-generated food platform. We developed the product for web, iOS and Android.

    chefkoch.de

    • VueJS
    • PHP
    • On-Premise
    • Amazon Web Services
  • Hirschhausen Diet Interval Fasting / Mobile App 2019

    I managed a team of up to eight developers, designers and product owners in a SCRUM project. We had to meet a tight deadline and launch apps and backend in around three months.

    Hirschhausen Diät

    • React Native
    • Ruby On Rails
    • Amazon Web Services
  • Hochzeitsplaza Wedding platform / Headless CMS 2015

    I have been heading maintenance and development of this site since the 2015 relaunch. The chosen technologies still hold up nicely, with a headless CMS behind a Rails app.

    Hochzeitsplaza

    • Ruby On Rails
    • Amazon Web Services
    • Contentful
    • Strapi
  • Hausgold PropTech / Lead Generation 2014

    Within a few weeks I built the MVP for an SEO-oriented platform to generate leads for a real estate brokerage website.

    Hausgold

    • Ruby On Rails
    • Amazon Web Services
  • Pay With A Tweet Social commerce / Social payment 2014

    I guided development and product management to relaunch a platform that allows paying for goods with social reach.

    Pay With A Tweet

    • Ruby On Rails
    • Amazon Web Services
  • REBELLE Luxury resale / Marketplace 2013

    I guided development and product management for the first version of a custom marketplace, including logistics and an iOS-based B2B reseller app.

    REBELLE

    • Ruby On Rails
    • Objective-C
    • Amazon Web Services
  • stern eMagazine News magazine / iPad edition 2010

    As product manager I was responsible for the desktop and mobile app development of the first iPad version of a major German news magazine.

    stern eMagazine

    • Adobe Flex/Woodwing
    • AppStore