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Sathish Kumar

@sathishkumar21

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Senior Android Developer | Kotlin · Compose · KMP | Berlin 🇩🇪 | Open to Work

Germany

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At ubiMaster, I build Android learning experiences end-to-end, including real-time video calls, live classes, and WebSocket-based chat using Kotlin, Jetpack Compose, Agora SDK, and structured concurrency.

I've streamlined releases with Fastlane and GitHub Actions, migrated reactive UI data from LiveData to StateFlow and SharedFlow, and maintained modular, testable applications with Clean Architecture, SOLID principles, and automated testing.

Previously, I owned Android delivery for Juwelo TV's live jewellery shopping app and built video streaming, Camera2, AWS S3, fingerprint enrollment, and backend-integrated mobile products across freelance and in-house roles.

Experience

Work history, roles, and key accomplishments

Current

Senior Android Developer

Current

ubiMaster GmbH

Dec 2022 - Present (3 years 8 months)

Delivered end-to-end Android app development lifecycle, reducing release cycle time by streamlining CI/CD pipelines with Fastlane and GitHub Actions. Built real-time video call and live class features using Agora SDK, and migrated reactive data layer to StateFlow and SharedFlow.

Kotlin Jetpack Compose MVVM Clean Architecture Coroutines SharedFlow WebSockets Retrofit Koin Junit Mockito Espresso Fastlane Firebase CI CD Git

Senior Android Developer

Juwelo TV Deutschland GmbH

Feb 2021 - Nov 2022 (1 year 9 months)

Owned the Android product end-to-end for a live TV jewellery shopping app, implementing UI features, backend API integrations, and Play Store releases. Built live-streaming TV playback and responsive multi-resolution UI in Kotlin and MVVM.

Kotlin MVVM ExoPlayer Google Analytics Firebase Git Jira

Android Developer (Freelance)

Payper Creative

Jul 2019 - Dec 2020 (1 year 5 months)

Delivered backend API integration and responsive UI across client Android projects using Kotlin and MVVM, ensuring clean code architecture and consistent experience across device resolutions. Integrated Firebase Analytics for post-launch monitoring.

Kotlin MVVM Git

Android Developer

Innobot Systems Pvt Ltd

May 2017 - Apr 2019 (1 year 11 months)

Built a custom ExoPlayer-based video player supporting live streaming, video recording via Camera2 API, and audio/video upload and playback via AWS S3. Integrated Firebase Crashlytics for production stability monitoring.

Kotlin ExoPlayer Camera APIs S3 Firebase Crashlytics

Android Developer

Next Techno Enterprises Pvt Ltd

May 2015 - Apr 2017 (1 year 11 months)

Developed a fingerprint registration and user enrollment application integrating hardware Fingerprint SDK and Printing SDK with backend APIs. Built report generation features from ticket data, improving operational visibility for field teams.

Android SDK Fingerprint SDK Printer SDK Backend