Senior Android Developer (large scale app)

What you work on today shapes where you’ll be tomorrow.

Looking for your next challenge as a Senior Android Developer? We may have the right opportunity for you.

At B3, we start with people and their experience. We match projects to your skills and professional growth path. Our consultants work across a wide range of industries and technologies, delivering IT projects both in Poland and internationally. This allows you to build your career in a deliberate way - not by chance.

We are part of an international organization listed on Nasdaq Stockholm, operating in 11 countries. In Poland, we operate with full autonomy. We choose our technologies, processes, and ways of working while maintaining the highest professional standards.

Join us today.

What we offer

• Work in a Scandinavian culture built on logic, trust, and open dialogue.

• Health and sports benefits tailored to your needs.

• Speed Coaching - short sessions designed to provide new perspectives and solutions.

• Sports training, an internal team, and opportunities to take part in competitions.

Role areas:

• Development of a large-scale native Android application - building and maintaining features in a mobile app with over 10M users, expanding into new European markets, with a focus on performance, quality and responsiveness.

• Mobile CI/CD and DevEx - designing, implementing and maintaining efficient CI/CD pipelines, automating builds and deployment, and optimising infrastructure across on-premises and cloud environments.

• Code quality and architecture - refactoring existing code, taking part in code reviews and team decisions, and building scalable and maintainable solutions based on MVVM and Clean Architecture.

What you need to join us:

Must have:

• Minimum 5 years exp in Android development - expert knowledge of the Android SDK, different versions of the system and device configurations, along with experience in optimising apps in Kotlin and Java.

• Hands-on knowledge of Jetpack Compose, Coroutines / Flow, Android Architecture Components, Jetpack libraries, MVVM and Clean Architecture, as well as Firebase configuration and REST API integration.

• Experience designing and maintaining efficient CI/CD pipeline s (GitLab CI, GitHub Actions or equivalent) - accelerating builds and ensuring high availability and scalability of on-premises and cloud infrastructure.

• Experience working in a foundation / platform team supporting a DevEx culture.

• Knowledge of Git, JIRA, Confluence, the code review process and Agile methodologies, and English at a minimum B2 level.

• Eligibility to work within Poland (citizenship, residence card, visa, etc.)

Nice to have:

• Experience working with LLMs / agentic workflows that accelerate the software development lifecycle (SDLC).

• Hands-on experience with Android WebView - embedding and integrating web content in a native enterprise app: native↔JS bridge, session and authentication handling, navigation, performance and security hardening.

• Experience with internationalisation and localisation of mobile apps (multi-region, multi-language, per-market configuration).