16.10.2026 aktualisiert


100 % verfügbar
Senior Android Engineer & Mobile App Developer
Köln, Deutschland
Weltweit
Master of Science in Electrical Engineering & Informational TechnologyÜber mich
I am a Freelance Android Engineer with 10 years of hands-on experience building high-quality, scalable, and user-friendly apps.
Skills
AndroidAndroid StudioMobile Application DevelopmentDependency InjectionGradleMonitoring-ErgebnisseKotlin
I am a Freelance Android Engineer with 10 years of hands-on experience building high-quality, scalable, and user-friendly apps.
What I offer:
I help you go from idea to delivery - whether you need reliable advice, a meaningful prototype, or production-ready app. I can join your team as a long-term contributor or work independently on a fixed-scope project. I am highly motivated and dedicated to every project I take on.
My work as a freelancer is about creating solutions that last. I design and build Android apps with long-term maintainability in mind: clean architecture, scalable code, and careful attention to detail so that what I deliver continues to add value for years.
Beyond technical skills, I bring strong team adaptability. Whether I am joining an established engineering group or collaborating with non-technical stakeholders, I make sure I:
• Listen carefully to understand the real problem
• Ask the right questions to uncover hidden needs
• Adapt quickly to workflows, cultures, and priorities
My core expertise:
• Kotlin, Android SDK, Jetpack libraries
• Custom UI components & Material Design implementation
• API integration & offline-first architecture
• Room, SQLite, DataStore for persistence
• Dependency injection (Koin), Coroutines, Flow
• Unit/UI testing & CI/CD pipelines
Clients I work with:
• Tech startups needing to launch quickly
• Agencies that want extra Android capacity
• Companies creating, optimizing or refactoring apps
Contact:
If you’re looking for an experienced Android specialist who can jump in quickly and deliver, let’s connect!
Erfahrung
Berufserfahrung5 - 10 Jahre
Freelancer seit2025
Sprachen
DeutschMutterspracheEnglischverhandlungssicherFranzösischgutSpanischGrundkenntnisseKroatischGrundkenntnisse
Projekthistorie
- Decreasing crash affected user rate from 12.18% to 0% by fixing a variety of bugs
- Implementing a new feature for logistical delivery process optimizatior
- Designing and implementing this feature using Kotlin, Compose, Koin, Flow, Coroutine, Instana
- Enhancing Android skills, improving language skills, volunteering for social projects, experiencing foreign cultures, trekking in backcountry, dancing tango
- Leading and bearing technical and functional responsibility for the two most central apps used in all sixteen national food fulfillment centers enabling 1200 employees a day to commission customer orders
- Designing and implementing features for these two apps using Kotlin, Compose, Koin, Flow, Coroutine, Firebase
- Ensuring clean app architecture by applying guidelines and patterns of Android comunity
- Professional and technical onboarding and training of three new android developers
- Drafting complex logistical processes and mapping determined requirements into the apps
- Refactoring with result of one-activity, all Compose, multi module app
- Analyzing and evaluating workflows during on site visits at food fulfillment centers for process optimisation
- Conducting error analyses and fixing bugs within the scope of third level support
- Consulting with interdisciplinary teams (QA, Ul / UX, Analytics) for quality improvements of the apps
- Improving logging by using Firebase Crashlytics and customizing flow to specific
- Implementing Problem Json like pattern between backend and app to separate business from technical errors
Zertifikate
Professional Scrum Master (PSM)
scrum.org2019
Professional Scrum Developer (PSD)
scrum.org2017
Oracle Certified Associate Java SE 8 Programmer
Oracle2016