Build an app on solid foundations.
I bring product requirements, architecture and delivery together through to a usable release.
Senior App Development · Hamburg and remote
I build apps and take technical ownership.
For product owners and engineering teams building an app, stabilizing one or adding senior capacity where it matters — from frontend to backend.
- Flutter for iOS, Android, web and desktop
- Frontend, backend and architecture
- Direct collaboration · Hamburg or remote
Paul Köhler
Development and technical consulting
Development and technical consulting
Experience from projects for and with
01 / Featured project
Yourny Travel & Leisure
From the app to day-to-day operations.
For Yourny, I built the app, backend and operations — including bookings, group features and more than three million hotels.
View project details- 01
App
- 02Serverpod, PostgreSQL and more than 3M hotels
Backend & data
- 03Payments, group logic and real-time features
Booking
- 04Docker, deployments and monitoring
Operations
My responsibility Full-stack development and technical architecture
02 / Engagement and collaboration
Where I can join an app project.
Depending on where the project stands, I build, stabilise or strengthen it — with decisions both product and engineering can follow.
Move an app forward without losing stability.
I surface risks and move the product and its operation forward in controlled steps.
Add senior capacity where it counts.
I take ownership of a defined area and work directly within the existing team and process.
How we work
Start with clarity. Deliver visibly. Hand over cleanly.
- 01
Clarify
We make requirements, risks and open decisions visible.
- 02
Build
I deliver the app, backend and integrations in reviewable increments.
- 03
Hand over
Testing, operations and knowledge transfer are part of delivery from the start.
03 / AI in products and development
What AI improves here in practice.
Two examples from products in active development.
The responsibility stays with me.
- Define the task
- Review the result
- Plan for failure
04 / First step
Where does your app project stand?
Tell me briefly where the product stands and what needs to work reliably next.