johann philipp strathausen

berlin based senior dev

black-and-white drawing of a young man with glasses

Johann Philipp Strathausen

Senior Full Stack Engineer

Contact

Profile

I help teams ship AI-powered products — from idea to production. With 16+ years of full-stack experience, I specialize in building LLM integrations that genuinely work, not just impressive demos.

I co-founded Fit Analytics (now a market leader in online size recommendations used by ASOS, Uniqlo, The North Face) and led development at Codepan on projects for Daimler, Bosch, Wix, and Webasto. Currently freelancing on AI-powered products across recruiting, energy compliance, and aerospace.

I excel in fast-paced environments by identifying pragmatic solutions that balance immediate results with long-term maintainability.

My tools of choice: TypeScript, React, Next.js, Node.js, Postgres, and Python — plus OCaml and Rust when the project calls for it.

Experience

Recless — Freelancer (2025—2026)

  • LLM-powered recruiting tool with LinkedIn integration, candidate screening, and vacancy management
  • Non-technical product owners can use LLM prompts to tweak application logic safely
  • Technologies: Next.js, tRPC, Drizzle, PostgreSQL, BullMQ, Playwright, TypeScript

be-rate.com — Freelancer (2025)

  • Building energy analysis and compliance platform with EnergyPlus simulations and PDF report generation
  • Technologies: Next.js, React, Express, MySQL, Drizzle, BullMQ, Puppeteer, Three.js, TypeScript, AWS

m-click.aero — Freelancer (2025)

  • German airspace management software
  • Technologies: OCaml, Reason, Melange, React

Codepan GmbH — Senior Full Stack Developer (2024—2025)

  • LLM-based checklists for financial markets — upload documents and get automatic question answering
  • Technologies: Python, Ollama, PostgreSQL, Next.js, React, TypeScript, Haystack, Llama-Index

Your Juno — Senior Developer (2021—2024)

  • Mobile app for financial education for women and non-binary people
  • Video content, social networking, educational tools — bootstrapped from the ground up
  • Technologies: Prisma, PostgreSQL, TypeScript, React, React Native, GraphQL

RJM Business Solutions — Freelancer (2020—2021)

  • Archeology software, cartography, LiDAR processing, geometry authoring
  • Technologies: QGis, TypeScript, React, Django, Python, PostgreSQL

Codepan GmbH — Lead Developer / CTO (2014—2020)

  • Projects include: wescale-jaggaer (Bosch), epek.app, Vehicle Lens (Daimler/Fleetboard), infarm.com, pogastro.com, quanto, Wix Education
  • Technologies: Django, Python, React, Node.js, Angular, MongoDB, PostgreSQL, AWS, Azure, Kubernetes, Docker

m-click.aero — Freelancer (2014)

  • Aerospace management interfaces, e-government platforms
  • Technologies: PostgreSQL, PostGIS, PHP/Laravel, OpenMaps, SVG, JavaScript

Fit Analytics GmbH — CTO, Co-Founder (2010—2014)

  • Technical co-founder; built first prototype that became a world-leading online size advisor
  • Used by major brands: The North Face, ASOS, Uniqlo, and more
  • Technologies: MySQL, Redis, MongoDB, Node.js, Python, PHP, OpenCV

Fraunhofer Institute FOKUS — Junior Developer (2007—2010)

  • Semantic reasoning, location-based services, Tokyo subway simulations
  • Technologies: J2EE, J2ME, JavaScript, Prolog, Semantic Web

Side Projects

  • thefoodie.space — AI-powered link-in-bio for food creators. Auto-syncs TikTok posts, generates recipes from video content
  • commentable.space — Self-hosted commenting system with AI moderation. Built with Swift/Vapor
  • pleeboo.com — Who-brings-what app for community events
  • laundryroom.social — Free open-source Meetup alternative
  • 4fram.es — Converts Lomo Action Sampler photos into animated GIFs
  • gpt_commit — Git commit message generation with OpenAI

Education

Freie Universität Berlin (2003—2010)

  • Degree: Diploma in Computer Science
  • Thesis: Semantic Profiles in UPnP AV

Technical University Bucharest (2005—2006)

  • Program: Academic Exchange Year in Computer Science

Languages

  • Native German
  • Fluent English & Romanian
  • Fair Hebrew & French
  • Basic Indonesian