Senior App Development · Hamburg and remote

Your app needs someone who connects product and engineering.

I help product owners build and develop Flutter apps, taking responsibility for the app, backend and technical decisions.

  • Flutter for iOS, Android, web and desktop
  • Frontend, backend and architecture
  • Direct collaboration · Hamburg or remote
Paul Köhler, senior app developer and technical consultant
Paul Köhler
Development and technical consulting

Experience from projects for and with

01 / Featured project

Yourny Travel & Leisure

Plan and book trips together.

As Founder & CTO of Yourny, I built the app, backend and operations. Travellers can plan together, choose hotels and book, with group features, payments and an inventory of more than three million hotel records.

View project details
  1. 01

    App

    Trip overview in the Yourny app Flutter for iOS, Android, web and desktop
  2. 02

    Backend & data

    Over 3M hotel records in PostgreSQL
  3. 03

    Booking

    Payments, group logic and real-time features
  4. 04

    Operations

    Docker, deployments and monitoring

My responsibility Founder & CTO · App, backend and operations

02 / Engagement and collaboration

When I can move your app project forward.

A new product, the next extension or a gap in the team: we agree on what I take ownership of and what needs to work.

How we work

Start with clarity. Deliver visibly. Hand over cleanly.

  1. 01

    Clarify

    We discuss the product’s current state, goals and open questions, then agree on my responsibilities and a suitable way to work together.

  2. 02

    Build

    I deliver the app, backend and integrations in reviewable increments.

  3. 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.

01 / Yourny

Hotel data becomes a feel for the place.

View the Yourny case

02 / Cook Book

Recipe photos become a draft ready for review.

The responsibility stays with me.
  1. Define the task
  2. Review the result
  3. Plan for failure

04 / First step

Let’s clarify what your app project needs.

Tell me where your product stands, what needs to work next and what support you need. In our first conversation, we establish whether I can help and what a useful starting point looks like.