Paul Köhler - Lead Flutter Developer

Q: Where is Paul based?

Paul is based in Hamburg, Germany .

Q: What languages does Paul speak?

Paul speaks the following languages: German (Native), English (Advanced) .

Q: How many years of experience does Paul have?

Paul has at least 31 years of experience. During this time, Paul has worked in at least 6 different roles and for 14 different companies . The average length of individual experience is 2 years and 2 months . Note that Paul may not have shared all experience and actually has more experience.

Q: What is Paul's latest experience?

Paul's most recent position is Lead Flutter Developer at Yourny Travel & Leisure .

Q: What companies has Paul worked for in recent years?

In recent years, Paul has worked for Yourny Travel & Leisure , Elea.ai GmbH , St. Leonhards , Rewe , and VetZ GmbH .

Q: Which industries is Paul most experienced in?

Paul is most experienced in industries like Information Technology (IT) , Healthcare , and Tourism and Hospitality . Paul also has some experience in Transportation and Logistics , Retail , and Professional Services .

Q: Which business areas is Paul most experienced in?

Paul is most experienced in business areas like Information Technology (IT) , Product Development , and Quality Assurance (QA) . Paul also has some experience in Human Resources (HR) and Project Management .

Q: Which industries has Paul worked in recently?

Paul has recently worked in industries like Information Technology (IT) , Healthcare , and Tourism and Hospitality .

Q: Which business areas has Paul worked in recently?

Paul has recently worked in business areas like Information Technology (IT) , Product Development , and Human Resources (HR) .

Recommended expert

Hamburg, Germany

Experience

Mar 2025 - Present

1 year

Lead Flutter Developer

Yourny Travel & Leisure

Full-stack mobile app development with Flutter and Serverpod for a travel platform, including booking logic, payment integration, real-time features and DevOps setup
Frontend/App Flutter/Dart development with BLoC state management
Backend & Cloud services: Serverpod integration, Firebase (Auth, Analytics, Remote Config) and real-time communication
Mobile platform expertise: deep linking, push notifications and platform-specific integrations
UI/UX & localization: custom design system, animations, localization, OpenStreetMap
DevOps & quality: code generation, integration tests, error monitoring with Sentry
Backend/Server Dart & Serverpod development for full-stack applications and real-time functions
Database management with PostgreSQL (3 million hotel records), Google Places API, Mollie payments and Firebase authentication
Tourism domain knowledge: hotel booking workflows, group trip planning, payment processing and accommodation search systems
DevOps & cloud: Docker containerization, VPS deployment, environment management and Sentry monitoring
Performance & scalability: database optimization, parallel processing and large-scale data synchronization for hotel information

Apr 2024 - Feb 2025

11 months

Senior Flutter Developer

Elea.ai GmbH

Developed the first MVP of a laboratory information system for medical labs
Implemented barcode scanner via device camera
Implemented document scanner via device camera
Collaborated closely with company leadership
Integrated into a top-performing team under time pressure
Followed agile methodology using Kanban

Dec 2023 - Apr 2024

5 months

Flutter Lead Developer

St. Leonhards

Took over an existing prototype
Coordinated and planned closely with project management
Integrated Apple and Google Health APIs
Implemented design specifications
Connected to internal APIs
Developed animations
Worked in an agile Kanban environment

Oct 2023 - Nov 2023

2 months

Flutter Lead Developer

Rewe

Implemented the recipe planner app
Developed local database for recipes, favorites and ingredients
Created responsive design for desktop, tablet and smartphone
Implemented animations using Flutter and Lottie
Integrated Rewe SSO via OAuth2 OpenID Connect
Automated conversion of master data from CSV to the data model
Followed agile Kanban methodology

Apr 2022 - Jul 2023

1 year 4 months

Hanover, Germany

Flutter Lead Developer

VetZ GmbH

Conceptualized, planned and implemented an app ecosystem
Implemented a design system in collaboration with the design team
Onboarded additional developers and conducted candidate interviews
Developed mobile apps with Flutter, Dart, BLoC, Intl and gRPC
Created prototypes to test various interfaces
Followed agile Scrum methodology

Dec 2021 - Mar 2022

4 months

Rostock, Germany

Flutter Trainer & Developer

ALTOW Digital Innovation

Trained, onboarded and coached the team and new hires in Flutter
Designed and implemented an MVP of an internal Flutter app and its architecture
Developed mobile apps with Flutter, Dart, Riverpod and BLoC
Created prototypes to test various interfaces
Followed agile Scrum methodology

Oct 2020 - Mar 2021

6 months

Frankfurt, Germany

Software Developer

Galeria Reisen

Frontend development with Angular 12, Typescript, Sass, Redux and Docker
Backend development with Node.js, Express.js, Typescript, Swagger and REST
Utilized Redis, MySQL and TypeORM for storage
Followed agile Scrum methodology
Onboarded team members
Launched the new application

Apr 2020 - Sep 2020

6 months

Frankfurt, Germany

On-site

Software Developer

Deutsche Bahn

Developed automated timetable construction for construction site operations
Frontend development with Angular, Typescript, HTML and SCSS
Backend development with Java, Spring Boot, MapStruct, JPA, Hibernate and Maven
Coordinated with other teams
Trained team on Camunda process orchestration
Used MariaDB, AWS and Protobuf
Followed agile Scrum methodology
Wrote tests with Cucumber and JUnit

Oct 2019 - Nov 2021

2 years 2 months

Giessen, Germany

Lead Developer

DGD Deutscher Gutachter Dienst GmbH

Served as tech lead, managed and onboarded new employees
Provided technical concept for new features
Developed mobile apps with Flutter, Dart and Redux
Developed backend with Firebase, Firestore, Cloud Functions, Typescript, Nest.js and Swagger
Followed agile Kanban methodology
Managed deployments for iOS and Android
Conducted usability tests with end users

Oct 2019 - Dec 2019

3 months

Frankfurt, Germany

Software Developer

Picard

Took over a Java legacy application for product planning, inventory management and price calculation
Planned reimplementation
Introduced Scrum development process
Onboarded additional developers
Drafted concept for future-proof reimplementation using Java, Spring Boot and Angular

Jan 2019 - Sep 2019

9 months

Frankfurt, Germany

Software Developer

Thomas Cook

Frontend development with Angular and Angular Universal (server-side rendering), Typescript and Redux
Backend development with Node.js, Express.js, Typescript, Swagger, REST and Docker
Focused on performance optimization
Integrated multiple APIs
Followed agile Scrum methodology

Aug 2018 - Dec 2018

5 months

Frankfurt, Germany

Software Developer

detim IT Consulting

Developed a web application for project and employee management
Frontend development with Angular and Typescript
Backend development with Java, Spring Boot, JPA, Hibernate and REST
Implemented microservice architecture
Used MySQL for data storage
Followed agile Scrum methodology

Aug 2017 - Aug 2018

1 year 1 month

Hungen, Germany

Software Developer

Vitaltec UG

Developed the ‘Vieva’ desktop application with C#, HTML, CSS, Javascript, Vue.js and Bootstrap
Implemented pulse measurement and hardware communication
Visualized measurement data
Ported core from .NET Framework 4.7 to .NET Standard
Enhanced data visualization
Conducted usability tests
Refactored code and planned projects

Apr 1995 - Present

30 years 11 months

Curiosity and Commitment

Enthusiasm for modern technologies and sophisticated solutions
Ambitious problem solver

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Information Technology (31 years), Healthcare (2.5 years), Tourism (2 years), Retail (0.5 years), Professional Services (0.5 years), and Transportation (0.5 years).

Information Technology

Healthcare

Tourism

Retail

Professional Services

Transportation

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (31 years), Product Development (7.5 years), Quality Assurance (2 years), Human Resources (1.5 years), and Project Management (1.5 years).

Information Technology

Product Development

Quality Assurance

Human Resources

Project Management

Skills

Very Good

Flutter
Dart
Serverpod
Firebase (Auth, Analytics, Remote Config, Cloud Messaging, Firestore)
Communication
Coaching
Leadership
Prompting

Good

Postgres
Docker
Docker-compose
Github Actions
Vps Deployment
Sql
Sentry
Swagger
Node.js
Nest.js
Express.js
Spring Boot
Jpa
Hibernate
Typeorm
Teamcity
Microservices
Solid.js
Html
Rest
Scss
Redis/redux
Cucumber
Camunda
Junit
Gulp.js
C#
Npm
Yarn
Gradle
Maven
Angular
Java
Typescript

Languages

German

Native

English

Advanced

Education

Mittelhessen University of Applied Sciences

Bachelor of Science · Computer Science · Giessen, Germany

Profile

Created

September 2025

Last Update

December 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Paul based?

Paul is based in Hamburg, Germany.

What languages does Paul speak?

Paul speaks the following languages: German (Native), English (Advanced).

How many years of experience does Paul have?

Paul has at least 31 years of experience. During this time, Paul has worked in at least 6 different roles and for 14 different companies. The average length of individual experience is 2 years and 2 months. Note that Paul may not have shared all experience and actually has more experience.

What roles would Paul be best suited for?

Based on recent experience, Paul would be well-suited for roles such as: Lead Flutter Developer, Senior Flutter Developer, Flutter Lead Developer.

What is Paul's latest experience?

Paul's most recent position is Lead Flutter Developer at Yourny Travel & Leisure.

What companies has Paul worked for in recent years?

In recent years, Paul has worked for Yourny Travel & Leisure, Elea.ai GmbH, St. Leonhards, Rewe, and VetZ GmbH.

Which industries is Paul most experienced in?

Paul is most experienced in industries like Information Technology (IT), Healthcare, and Tourism and Hospitality. Paul also has some experience in Transportation and Logistics, Retail, and Professional Services.

Which business areas is Paul most experienced in?

Paul is most experienced in business areas like Information Technology (IT), Product Development, and Quality Assurance (QA). Paul also has some experience in Human Resources (HR) and Project Management.

Which industries has Paul worked in recently?

Paul has recently worked in industries like Information Technology (IT), Healthcare, and Tourism and Hospitality.

Which business areas has Paul worked in recently?

Paul has recently worked in business areas like Information Technology (IT), Product Development, and Human Resources (HR).

What is Paul's education?

Paul holds a Bachelor in Computer Science from Mittelhessen University of Applied Sciences.

What is the availability of Paul?

Paul is immediately available full-time for suitable projects.

What is the rate of Paul?

Paul's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.