I build accessible web applications that are still a pleasure to maintain five years from now. For the past eight years.
Full-Stack Developer with 8+ years of experience developing modern web applications. I enjoy complex challenges — and even more to solve them.
My focus is on React, TypeScript, and Python (Django/FastAPI), complemented by Next.js, Node.js, and PostgreSQL. I build systems designed to scale—ranging from interactive data visualizations and AI platforms to clinical applications. I prioritize clean code, proven design patterns, and regular refactoring just as highly as accessibility (WCAG/BITV), which I view as a fundamental standard rather than an optional add-on.
Working on something exciting? If you need fresh eyes or extra hands on deck, I’m up for the next adventure.
A React web application for visualization of bird detections on an interactive map. The app displays migratory bird data from the BirdWeather network as color-coded clusters on a map, featuring temporal animation with day/night filtering.
Interactive project scheduler for a wind turbine manufacturer – replacing manual Excel planning with a timeline-based scheduler featuring drag & drop.
AI-powered legal analysis SaaS with real-time streaming, document knowledge bases, and consumption-based billing.
Clinical pregnancy monitoring platform with ML-based risk prediction, built on Django and PostgreSQL for a Berlin hospital research institute.
Redesign of Berlin's official citizen participation platform — a Django/React application enabling civic engagement across 12 districts.
Technical leadership for a bespoke case-handling system in a notarial practice — identity-document OCR with Regula, plus an independent review of security, data protection, reliability and maintainability.
Four years on a digital therapeutic platform for children diagnosed with Internet Gaming Disorder at BIH @ Charité — 34 CBT-based tasks, gamified engagement, encrypted patient data and bilingual therapy content.
Four and a half years of full-stack development on a TYPO3 platform for institutional investors — fund discovery and filtering, automated data imports, performance charts, and a frontend redesign delivered on a live system.
A browser-based hex map editor built and launched as a solo SaaS product — canvas rendering, procedural generation, fog of war, real-time multiplayer, and subscription billing.
Philipp supported us at Liquid Democracy e.V., first as an employee and later as a freelancer. On the Kiezradar project I worked closely with him. As a project lead you hope for team members who are reliable, fast, and thorough, and who bring a team-oriented, respectful way of working and communicating. Philipp brings all of this — it was a real pleasure having him on the team. Happy to work with him again any time!
Philipp supported us at Liquid Democracy e.V., first as an employee and later as a freelancer. On the Kiezradar project I worked closely with him. As a project lead you hope for team members who are reliable, fast, and thorough, and who bring a team-oriented, respectful way of working and communicating. Philipp brings all of this — it was a real pleasure having him on the team. Happy to work with him again any time!
Philipp has broad, battle-tested expertise in web development from a wide range of projects. The quality of his work is always top — he consistently thinks about potential regressions and long-term maintainability. He translates complex technical details on the fly into language anyone can follow, in either German or English. Read the full version on LinkedIn →
Being able to work alongside Philipp Veller on the same project is a real privilege. He consistently impresses through the way he works with team members and through his exceptional skills as a developer — a large share of the project's success comes down to Philipp's commitment. Read the full version on LinkedIn →
I'm open to exciting projects and look forward to hearing from you.