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.

Focus area

ISO 27001 certified, without the ballast

When customers or partners require an ISO 27001 certification from you, I help you get there – on a lean path: privacy-friendly tools, manageable cost, little ongoing effort.

More on the ISO 27001 page

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