Mobile Developers in Germany

Responsible for the architecture and strategic direction of the Future Railway Mobile Communication System (FRMCS) in the international rail environment. Managing architecture activities, requirements management, stakeholder alignment, and standardization bodies.

Key contributions

• Definition of the end-to-end system architecture for FRMCS across transport, core, service, and operations domains.
• Creation of target architectures, architecture roadmaps, and operating models.
• Conducting architecture workshops and technical governance with international stakeholders.
• Creation of architecture diagrams, integration concepts, requirements specifications, and technical roadmaps.
• Design of an event-driven OSS architecture for future operations processes.
• Consulting on topics such as QoS, security architecture, API integration, cloud-native deployment, and interoperability.

Conceptualizing and developing AI-powered app MVPs from the first idea to a working product. I combine UX strategy with modern AI and no-code tools — especially Claude and Claude Code, where I work directly in the terminal on real code (React, Vite), complemented by Figma, Bolt.new, and Base44 — to quickly validate and build product ideas. Personal platforms: Nutrycoach.ai (AI nutrition coaching with role-based dashboards for clients, coaches, and admins, AI meal analysis, and a scalable design system) and LuxuryBandit (content/creator app). This led to my own practice 'AI-assisted App Strategy', which combines human creativity, UX logic, and intelligent automation.

• Contributed to the architecture design process, resulting in scalable and maintainable solutions for complex projects.
• Enhanced app performance by optimizing code and implementing efficient algorithms.
• Stayed current with industry trends to ensure implementation of best practices in app development.
• Led a team of iOS developers for timely completion of projects and achieving client satisfaction.
• Translated basic design plans into full iOS app frameworks, delegating project components to appropriate team members.
• Estimated work hours and tracked progress using Scrum methodology.

• Development of an iOS app that combines public transport and sharing services
• Collaboration in Scrum within a large cross-functional team
• Creation of reusable components with SwiftUI and Combine
• Development of custom solutions for Apple Maps

• Developed a Flutter app for eID ID card logins
• Focus: Flutter, iOS, eID, AusweisAppSDK, Mason, Keycloak, Agentic Coding, Arc42, Jenkins

• Support in restructuring and designing the group's internal Android apps
• Defining essential modules and implementing accessible components
• Establishing agile approaches at an international level
• Technologies & Methods: Kotlin, Android, JUnit 5, Koin, Azure DevOps, Android Studio, Git, Jetpack Compose, Coil, Flow API, Ktor, Coroutines, TypeScript, Node.js

• Further development of the Android app "StarMoney"
• Major XML to Compose redesigns
• Introduction of new technologies and architecture
• Implementation of instant bank transfer
• Development following the agile Scrum process

• PAYBACK GmbH: PAYBACK app - a loyalty bonus program and customer card that allows users to collect points.

• Enhanced the application's architecture by restructuring and modularizing it.

• Refactored and improved complex features using SwiftUI and The Composable Architecture.

• Maintaining, bug fixing, optimizing, troubleshooting, and continuously improving the app.

• Facilitating and planning the onboarding of new developers and providing mentorship.

• Assistance in the hiring process, including evaluation, interviews, and strategic planning.

• Porsche Digital GmbH: Development of the Porsche Road Trip app that allows users to comfortably plan and navigate through spontaneous drives and individual road trips along curated premium routes.

• KI Labs: Development of a MVP for a large automotive company.

• Snapp Mobile Germany GmbH: Equitel Banking - Consumer digital banking app for Equity bank, one of the largest banks in Sub-Saharan Africa.

• comdirect Mobox - Banking app to manage current, savings and credit card accounts for teenagers. Addressed technicalities of implementing playful UI with customizable options and various offline features.

• Deutsche Bahn AG - Development of a prototype for the next generation of companion app for train travellers.

• optile GmbH: KPI Dashboard - KPI tracking of online payments for merchants that use optile's online payment solutions.

• Every Interaction: Watchy - Composer of Apple Watch screenshots, which allows users to export the composed image and share it.

• Developing a model-based AI where natural language is interpreted as formal relations.
• Natural language terms are not considered rigid but fluid and can be negotiated in a context so meaning resolves by iteratively specifying.
• Develops all kinds of model solutions.
• Backed by natural language and data annotation.
• Requirements to code and other solutions.

• Working on Telecommunication Apps on Android under NDA for the Military
• Participation in the development of backend services (Spring, Java)
• Android Development, Kotlin, Compose, REST, JSON, State-Machines, Android Studio, IP Communication, Cybersecurity, Agile

• Maintenance and further development of a web portal and a mobile app as a full-stack developer.
• Handling customer requests and bug fixes.
• Implementing REST APIs and database access with Java Spring.
• Maintaining and enhancing a web frontend with AngularJS.
• Maintaining and enhancing an iOS and Android mobile app with Qt/C++/QML, including updating the app in the respective stores.
• Technologies: Qt/C++/QML, AngularJS, Java Spring, MongoDB, OAuth.

• Social media team, SMM strategy and implementation
• Event management and organization from concept to execution
• Creative storytelling and writing
• Digital marketing and media editing tools such as Adobe Premiere, Capcut, Canva and much more

• Further development of a complex laboratory information system
• Development of new features including design
• Close collaboration with company leadership
• Embedded in a top team with consistently high performance under time pressure
• Agile approach, Kanban

• Optimized the Amp healthcare app alongside a senior developer, specifically enhancing data caching mechanisms which led to a 25% improvement in load times.
• Applied MVI architecture, resulting in a 30% decrease in bugs and streamlining testing processes.
• Implemented CI/CD with Bitrise, reducing deployment sizes from 120MB to 104MB.
• Led the migration of 40% of the Java codebase to Kotlin.
• Achieved 85% unit test coverage.