Job Description

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

Looking for your next challenge as a Senior iOS Developer (Kotlin Multiplatform)? 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.

Job areas:

• Building a mobile application for a TMS-class system (Transport Management System) from scratch - an internal tool supporting transport and logistics processes within the organization
• Co-creating a newly formed mobile task force - real impact on the architecture, project foundations, patterns and shared components
• Developing the shared layer in Kotlin Multiplatform and the native iOS layer in SwiftUI - including test coverage, code reviews and documentation of architectural decisions

What you need to join us:

Must have:

• Extensive, proven SwiftUI experience (advanced layouts, state management, performance optimization)
• Strong knowledge of mobile architectures: MVVM, Clean Architecture, SOLID
• Hands-on experience with Swift Concurrency (async/await, structured concurrency, actors, task cancellation)
• Commercial experience with Kotlin Multiplatform (KMP)
• English at min. B2 level, Polish min. C1
• Eligibility to work in Poland (citizenship, residence card, visa, etc.)

Nice to have:

• Knowledge of composable architectures
• Experience with modularization strategies (separating feature/core layers, interface boundaries)
• Proficiency with Swift Package Manager
• CI/CD experience: release orchestration, build pipelines, fastlane, test automation
• Strong Git skills (branching strategies, PR hygiene, conflict resolution)