Freelance Software Engineer · Munich
From idea to shipped product. Web, iOS & AI.
For founders who need an MVP and teams that need it done right: one engineer who scopes, designs, builds, and launches.
Direct line to the engineer behind NeatPass, the PDF-to-Wallet app featured by Apple. No agency layers, no handoffs.
- Full-stack delivery: scoping, design, build, and launch, all from one person.
- Apple is building my app's concept into iOS 27. I shipped it first.
- TUM computer science, top 8% of the cohort. Fluent in German and English.
Results you can verify
Nothing here is a claim you have to take on faith. The App Store listing, the press coverage, and the code are all public.
NeatPass
PDF to Apple Wallet, fully on-device
Airlines, gyms, and ticket shops send PDFs. Apple Wallet wants passes. NeatPass converts any PDF into a Wallet pass directly on the iPhone, with on-device AI and zero uploads.
I took it from idea to App Store entirely solo: product design, native Swift app, on-device ML pipeline, zero-knowledge pass signing, localization, and launch.
Apple validated the idea
At WWDC 2026 Apple added pass creation to Wallet in iOS 27, from a template or a live camera scan, but not from a PDF or screenshot. I shipped the harder part first, and built NeatPass to stay the more capable app.
Real people, every day.
All generated on-device.
From 212 ratings.
Picked by Apple's editors.
Want this level of execution on your project?
The first call is free. You leave with an honest assessment, whether we work together or not.
Services built around your product
One engineer, the full stack. Pick what you need or combine them into an end-to-end build.
Web apps
Dashboards, customer portals, and marketing sites in React and TypeScript that load fast, rank well, and stay easy to extend.
iOS & Mac apps
Native apps for iPhone and Mac, from first screen to App Store launch. I built NeatPass end to end, including its on-device AI pipeline.
AI tools & automation
LLM features, agent workflows, and Python pipelines that cut hours of manual work. Built to run reliably, not just demo well.
Technical consulting
MVP scoping, architecture reviews, and a second opinion before you commit budget. I lead software at TUM.ai and have tutored hundreds of CS students.
How we can work together
Every project needs a different setup. These are the ways we can work together, and we'll shape the one that fits yours.
- MVPValidate the idea fast
- Full buildIdea to launched product
- TakeoverPick up an existing codebase
- Ongoing supportKeep improving after launch
- MentoringLevel up you and your team
- AdvisoryScoping, architecture, reviews
No fixed packages, no price lists. Just tell me what you have in mind and you'll get a clear, honest estimate after a free call - whether or not we end up working together.
A simple, transparent process
No black boxes. You always know what is shipping and why.
Discover
We start with a free 30-minute call about goals, scope, and constraints. You get a written plan and a clear estimate, with no obligation.
Build
Short, visible iterations with regular demos. You see working software as it takes shape, not a big reveal at the end.
Ship & support
We launch, measure, and refine. I stay around to make sure it runs smoothly in production.
Who you'll be working with
I'm Justin Lanfermann, a software engineer from Munich. I study computer science at TUM in the top 8% of my cohort, lead software development at TUM.ai, and work in development and infrastructure at Westend61.
I shipped NeatPass solo, hold the CHECK24 GenDev stipend, and have tutored hundreds of CS students. Young, yes. That's exactly why everything on this page is public and verifiable.
Questions, answered
Tell me what you're building
Free 30-minute scoping call. Honest assessment, clear next steps, reply within a day, in German or English.