Hello, I'm
Freelance Senior Software Engineer
Helping companies turn ideas into high-quality Android applications that are scalable, maintainable, and user-friendly.
I am a freelance Senior Software Engineer specializing in Android development, with over a decade of experience delivering stable, high-performance mobile applications used by real customers at scale. I focus on building software that is not only technically solid but also reliable, maintainable, and prepared for long-term growth.
I have worked with startups, agencies, and established companies, helping teams accelerate development, improve code quality, and reduce technical debt. I quickly adapt to existing projects and workflows, allowing me to contribute effectively whether the goal is expanding features, stabilizing production systems, or modernizing older applications.
My core expertise includes Kotlin, modern Android architecture, and performance optimization, alongside improving legacy systems and designing new solutions from the ground up. I aim to be a dependable engineering partner who understands both technical complexity and business priorities, helping clients move projects forward with confidence.
Kotlin, Jetpack Compose, Android SDK
Flutter, Kotlin Multiplatform
MVVM, Clean Architecture, CI/CD
Optimization, profiling, memory management
REST, GraphQL, WebSocket, third-party integrations
Material Design, custom UI, animations
A selection of projects across various industries
AI-powered creative studio app for video editing with Jetpack Media3, ExoPlayer, and automated AI-driven video generation.
Embedded Android system UI for next-gen in-car infotainment platform with KMP-based companion app for iOS and Android.
Mobile-first fintech app empowering users to invest in stocks, ETFs, and cryptocurrencies with fast, secure, and scalable trading technology.
Cross-platform chat-based app with custom API framework integrating AI models and GPT-4 API for intelligent interactions.
Mobile app enabling users to compare, book, and manage car rentals through an intuitive interface with real-time pricing, availability, and booking management.
COVID-19 contact tracing app using Apple/Google exposure notification API, maintained as open-source for German government.
Aggregated rental marketplace delivering real-time property availability, pricing optimization, and streamlined reservation management for travelers worldwide.
Multi-platform streaming service for smart TV with DRM implementation and migration from web to various TV devices.
"Juraj took the lead and onboarded into the project quickly. Overall Juraj has very strong Kotlin experience and worked well to modify existing UI and add new business logic into the app. He worked well with the team and his work integrated well with backend development. When the other Android team member left the project, Juraj was on par with the iOS team comprising two people. The project is running well, I am happy with the quality of work and would like to work together again in the future if possible."
"Juraj was a contractor for Captions for the past year. He helped us grow our Android product, building new features for zero to done with good attention to details and quality. During his work here, Juraj communicated well with the rest of the engineering team and stakeholders, which was important as one of the few remote person on the team. Juraj is a talented Android engineer who doesn't hesitate to jump on more technically complex issues and seeing them to resolution."
"We as ElevateX had the pleasure to place Juraj with a client of ours twice. The client is a very well-known fintech company. Juraj is very talented, knowledgeable, and hands-on, and brings a very positive can-do attitude to the table. Not only did he finish his tasks with the highest quality prior to the deadline but also stepped in where and whenever help was needed. We would highly recommend to work with Juraj."
Have a project in mind? Let's discuss how I can help bring your vision to life.
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