# Senior Software Engineer (Android) - Service Agreement at Flix

- Company: Flix
- Status: Open
- Workplace: On-site
- Location: Warsaw
- Level: Senior
- Discipline: Mobile
- Employment: Freelance
- Posted: 2026-10-21
- Skills: Android
- Apply: https://flix.careers/job/8873997002?gh_jid=8873997002

## Description

Rate: 135 – 170 PLN/hour (B2B) 
 We are looking for an experienced Senior Software Engineer to join Flix on a freelance/service agreement basis (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 stabilit

More Flix roles: https://deviantjobs.com/companies/flix