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HOME Mobile Development Senior Software Engineer (Android) - Service Agreement
  • Flix
  • Warsaw, 14
  • 8 days ago
Flix VERIFIED EMPLOYER

Senior Software Engineer (Android) - Service Agreement.

Mobile Development
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Senior Software Engineer (Android) - Service Agreement: our view in 3 lines...

  • The Role:This role is for an experienced developer who builds and maintains high-quality Android mobile applications with a focus on performance and user experience.
  • The Person:The person will design, develop, and maintain Android applications, optimise performance and accessibility, write tested code, support iOS and backend teams, and improve CI/CD pipelines and technical documentation.
  • Requirements:The ideal candidate has 6+ years of Android development experience and strong Kotlin expertise with Jetpack Compose, MVVM, and Coroutines, plus unit, integration, and UI testing, SOLID principles, CI/CD pipelines, GitLab, Fastlane, Docker, and Firebase SDK.

About the role

Rate: 135 – 170 PLN/hour (B2B)

We are looking for an experienced Senior Software Engineer to join Flix on a freelance/service agreement basis (a 1-year B2B contract). This is a contractor engagement for a seasoned professional who doesn’t just write code but thinks about the entire mobile ecosystem, including performance, quality, scalability, UX, and testing.  

Scope of Services

Bring expertise in building high-quality, scalable, and user-friendly Android applications to enhance the Flix passenger journey — optimizing key features such as post-booking and home page experiences, while incorporating innovative solutions that drive mobile development excellence. 

About the Engagement

  • Design, develop, and maintain high-quality Android applications with a focus on scalability, performance, and user experience.
  • Support closely iOS, Backend, and feature teams to align on feature specifications and ensure seamless cross-platform integration.
  • Drive technical improvements across the entire codebase, including architecture enhancements and codebase modernization.
  • Enhance app performance and user experience through UI optimizations, accessibility compliance, and improvements in battery usage, memory management, and load times.
  • Leverage analytics & metrics to make data-driven decisions, optimizing performance and engagement based on user behavior and app health.
  • Write clean, maintainable, high quality and testable code, ensuring high test coverage through unit, integration, and UI tests to guarantee reliability.
  • Actively contribute to improving CI/CD pipelines, app stability, and release processes, driving faster delivery and higher productivity.
  • Maintain clear, up-to-date technical documentation, including API specs, architectural decisions, and code comments, fostering transparency and knowledge sharing within the stakeholders. 

About You

  • 6+ years of Android development experience with a proven track record of building high-quality, user-facing Android apps. 
  • Strong expertise in Kotlin (Jetpack Compose, MVVM, Coroutines), with a deep understanding of Android architecture and best practices. 
  • Hands-on experience with performance optimizations, background services, memory management, and smooth user interactions (UI, animations). 
  • Experience with testing (unit, integration, UI testing) and a strong commitment to writing testable, maintainable code. 
  • Ability to drive technical strategy, ensuring high standards in code quality, performance, and scalability. 
  • Understanding of SOLID principles and software architecture patterns. 
  • Experience working with CI/CD pipelines and automated deployment systems (GitLab, Fastlane, Docker). 
  • Experience with Firebase SDK, including Firebase Analytics, Remote Config, and Crashlytics. 
  • Customer-centric approach with a focus on delivering great user experiences. 

Cooperation model

  • Cooperation based on a service agreement (B2B/freelance contract), not an employment contract.
  • You will operate as an independent contractor, responsible for delivering agreed services and submitting invoices 
  • Location: open for contractors based in Poland

 

Published November 4, 2026
Location Warsaw, Poland
Category Mobile Development  

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