Hannes D.

Mobile App Developer

Avatar placeholder
Bremen, Germany

Experience

Jun 2024 - Jun 2025
1 year 1 month
Bremen, Germany

Mobile App Developer

wikifolio

  • Developed and maintained a cross-platform mobile app with React Native (iOS/Android)
  • Planned and implemented new features as well as optimized existing functionality
  • Native rich-text editor (comment feature)
  • Dynamic tables and charts including animations
  • Deep and native linking (Branch.io integration)
  • Tests and maintenance of test automation (Jest, Maestro)
  • Code reviews to ensure code quality
  • Worked with CI/CD processes and automated release pipelines
  • Close collaboration with backend, design, and product teams

Technologies: React Native, JavaScript, TypeScript, SQL, SQLite, Xamarin, .Net, Python, AWS

Oct 2022 - Jun 2024
1 year 9 months

Freelance Mobile App Developer

Budget For Nomads

  • Development, testing, publishing, and marketing of a cross-platform finance app with Expo
  • Implementation in JavaScript, TypeScript, and React Native
  • Key features:
  • Track expenses and split budgets
  • Login, online/offline mode, and live sync
  • Automatic currency converter
  • Modern, dynamic, and interactive charts
Dec 2019 - Dec 2020
1 year 1 month
Freiburg im Breisgau, Germany

Mobile App Developer

Institute of Music Medicine, Freiburg

  • Complete front- and backend development of an app in the Xamarin .Net framework using C#
  • Database development in SQLite
  • Worked in an interdisciplinary team with medical professionals, physicists, and app designers

Summary

I am a passionate mobile app developer focusing on React Native and TypeScript. Besides my own finance app Budget For Nomads, I have worked in different teams on building complex mobile applications.

From scientific data projects to a commercial trading news app for wikifolio.

Through these projects, I have gained solid experience working with APIs, CI/CD, automated testing, cross-platform development, and agile collaboration.

My focus is on implementing UX-driven front-ends. I bring a friendly and motivated atmosphere to the team and have an eye for detail.

Languages

German
Native
English
Advanced

Education

Oct 2018 - Sep 2022

University of Freiburg

B.Sc. · Computer Science · Germany

Oct 2013 - Sep 2017

Chemnitz University of Technology

B.Sc. · Sensory and Cognitive Psychology · Germany

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