Klemens – Kotlin, GCP, Android

This project builds custom mobile and web applications for SMEs and startups, helping clients design, develop, and launch digital products across Android, iOS, cross‑platform, and backend systems.

• Led design and implementation of mobile applications for companies and startups.
• Provided software architecture and IT consulting.
• Delivered projects end-to-end from architecture and prototyping to production-ready implementation.
• Managed requirements analysis, conception, development, app store publishing, operations, and support.

Business‑critical Android application used by supermarket employees to process and fulfill customer orders across Germany.

• Developed and maintained features for a nationwide production Android application used in daily retail operations.
• Contributed as an external Senior Android Engineer within a cross-functional Scrum team.
• Implemented modern Android functionality using Kotlin, Jetpack Compose, Coroutines, Flow and REST/OpenAPI integrations.
• Focused on usability, reliability, performance, maintainability and testability.
• Contributed to automated testing using Kotest and MockK and supported the analysis and resolution of production issues.

A language-learning platform that streams video content and enriches it with interactive subtitles for web and smartphone apps.

• Led full-stack development of the uugot.it platform.
• Built apps for Android, iOS, and web.
• Developed backend, server components, API, and database solutions.
• Managed cloud infrastructure and DevOps.
• Developed Natural Language Processing and translation algorithms.

A B2B/SaaS chatbot platform for sports fan engagement on messaging platforms.

• Developed conversational interfaces and chatbot platform capabilities from the ground up.
• Built Natural Language Processing and messenger channel functionality for the sports sector.
• Managed product, development, and operations.
• Technically led customer projects for partners and clients including LAOLA1.at/Sportradar, FC Red Bull Salzburg, and Therme Wien.

Professional mobile app solutions for Android, iOS and web for corporations, organizations, and startups.

• Conceived, designed, and programmed professional mobile app solutions for smartphones, tablets, and the web.
• Provided technical direction and managed customer projects and own product developments.
• Worked as software architect and lead developer across app, web, and backend projects.