Freelancer profile translated to English.
Back to original languageAbout Hagen
As an experiencedSenior Full-Stack App Developerwith over two decades of practical experience, I offer you the holistic implementation of sophisticated web and mobile solutions. My technical focus is on developing performant cross-platform applications for iOS, Android, and the Web using **TypeScript**, **React.js**, and **React Native**.
I will support you in efficiently and scalably building your digital products from the initial requirements analysis to the productive release. I cover the entire spectrum of modern software development: from designing intuitive user interfaces in React to conceptualizing robust backend architectures withNode.jsand **GraphQL**.
My service portfolio and your added value:
- Cross-Platform Development:Creation of native apps for iOS and Android withReact NativeandExpowith consistent use ofTypeScriptfor the highest code quality.
- Full-Stack Expertise:Implementation of scalable backends and integration of cloud services such as **AWS**, **Firebase**, or **SQL**.
- Specialized Solutions:Expertise in developing offline-first applications, real-time functionalities, and complex e-commerce systems.
- Infrastructure & Quality:Building automated CI/CD pipelines and containerization with Docker to optimize your development processes.
Through my many years of experience in leadership positions, including as Lead Developer in e-commerce, I have the necessary understanding of complex stakeholder requirements and on-time project management. I place great value on clean, maintainable code and transparent communication to create long-term stable software solutions for your company.
I would be happy to support you in the implementation of your next project and bring my experience to your team.
German
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- SelbstständigSelf-employed Full Stack App DeveloperDIGITAL AND ITJanuary 2001 - Today (25 years and 7 months)Düsseldorf, Germany
- Development of custom web and mobile applications for various industries.
- Specialization in Expo and React Native for creating cross-platform apps.
- Implementation of backend solutions with Node.js and GraphQL.
- Integration of databases like Firebase, AWS RDS, MySQL, and CouchDB.
- Building CI/CD pipelines to optimize the development process.
- Collaboration with clients for requirements analysis and project implementation.
- findus Jugend- und FamilienhilfeApp DeveloperDIGITAL AND ITOctober 2022 - December 2024 (2 years and 2 months)Düsseldorf, Germany
- Development of a React Native app to support youth and family services employees with cross-platform support for Android, iOS, and Web.
- Use of Expo and EAS for efficient development and deployment processes.
- Implementation of offline-first and real-time features with Firebase.
- Ensuring accessibility and optimal user experience.
- Remote work with interdisciplinary teams.
- freshcells systems engineering GmbHFull Stack DeveloperDIGITAL AND ITSeptember 2016 - July 2020 (3 years and 10 months)Düsseldorf, Germany
- Development of web applications with TypeScript and React.js.
- Backend development with PHP and integration of RESTful APIs.
- Participation in e-commerce projects for international clients.
- Introduction of agile methods and support in process optimization.
- Hybrid work model between on-site presence and remote.
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Education
- Specialist in Application DevelopmentTWT Interactive2002Fachinformatiker für Anwendungsentwicklung