Open to opportunities

Sinisa Marjanovic

@sinisamarjanovic

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Lead Android Engineer with 11+ years shipping production apps and mentoring teams to near-zero defects.

Serbia

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What I'm looking for

I’m looking for a fully-remote B2B role where I can lead Android modernization, own CI/CD and release quality, and mentor teams using Kotlin, Jetpack Compose, and Clean Architecture.

I’m a Lead Android engineer with 11+ years shipping production Android applications and 6+ years leading cross-functional mobile teams.

I bring deep Kotlin and Java expertise across Jetpack Compose, Coroutines/Flow, MVVM and Clean Architecture, with dependency injection using Hilt and Koin. I’ve also built in-house SDKs and worked on media streaming with Media3 / ExoPlayer.

I’ve owned CI/CD and release pipelines at high cadence, enforcing unit- and UI-testing discipline to drive P0 defects to near-zero and achieve 99.9% crash-free sessions in production. I’ve improved app startup performance (~20%) using Android Baseline Profiles and Compose optimizations.

I’m comfortable serving as the technical authority between stakeholders and engineering, and I mentor engineers through large-scale architecture modernizations. From consultancy work delivering production implementations to modernizing streaming platforms for 800,000+ active users, I focus on reliable delivery, strong diagnostics, and maintainable architecture.

Experience

Work history, roles, and key accomplishments

Current

Android Development Consultant

Current

Bragi GmbH

Jun 2025 - Present (1 year 1 month)

Delivered end-to-end Android product implementations for a multi-brand audio companion platform, spanning Bluetooth connectivity through feature modules to release. Managed CI/CD and deployment pipelines and supported integration of in-house and third-party SDKs while improving cross-team diagnostic issue resolution.

Android Bluetooth CI CD CI Pipelines SDK Integration

Lead Android Engineer

Tyllo

Dec 2021 - Jun 2025 (3 years 6 months)

Led modernization of the EON streaming and live-TV Android application for 800,000+ active users across 10+ countries. Architected a modular migration to Jetpack Compose, Kotlin Coroutines/Flow, MVVM, and Koin, improving P0 defect levels and startup performance via Baseline Profiles and Compose optimizations.

Jetpack Compose Kotlin Coroutines MVVM Koin Unit Testing UI Testing Error Handling Baseline Profiles Performance Optimization

Senior Android Engineer (On-Call)

Creative Advanced Technologies

Jun 2021 - Feb 2024 (2 years 8 months)

Architected a Kotlin/RxKotlin network-diagnostic SDK for telecom field technicians, including traceroute visualization and DNS diagnostics. Maintained and optimized Android systems such as the Tamata e-commerce portal (Java, GraphQL) and led Android development for a social platform using unit testing and clean architecture.

Kotlin Android SDK Development Traceroute Java GraphQL Unit Testing Clean Architecture

Mobile Tech Lead

Consulteer

Mar 2019 - Jun 2021 (2 years 3 months)

Led technical modernization of Deutsche Bahn’s expense-management platform (100,000 active users), rebuilding the legacy app in Kotlin with RxKotlin, MVVM, and Clean Architecture. Transitioned to technical lead, serving as technical authority, overseeing API integration and data-modeling decisions, and contributing to building the Racing Unleashed app from the ground up with reactive programming.

Kotlin MVVM Clean Architecture API Integration Data Modeling Reactive Programming Technical Leadership

Earlier Android roles

Teamcubate

Jan 2014 - Jan 2019 (5 years)

Worked on Android engineering for international clients, including Kotlin/MVVM and exposure to React Native. Contributed to AR visualization using ARCore and Rajawali 3D, and to app monetization using Camera2 and Renderscript for real-time image processing.

Kotlin MVVM ARCore Rajawali 3D Java

Earlier Android roles

Arty

Jan 2014 - Jan 2019 (5 years)

Kotlin MVVM ARCore Rajawali 3D Java

Earlier Android roles

SMSRobot

Jan 2014 - Jan 2019 (5 years)

Kotlin MVVM ARCore Rajawali 3D Java

Earlier Android roles

Spoiled Milk

Jan 2014 - Jan 2019 (5 years)

Kotlin MVVM ARCore Rajawali 3D Java

Education

Degrees, certifications, and relevant coursework

Politehnička akademija

Technical High School Diploma, CNC machine programming & operation

Earned a Technical High School Diploma with focus on CNC machine programming and operation. Continued self-directed learning in mobile development over time.