Senior iOS Developer (KMP)

b3consultingpoland; Warszawa; Hybrid; PLN 190,000 - 290,000; Full time

Benefits offered by this job

Scandinavian culture

Health and sports benefits

Speed Coaching

Sports training and competitions

Job summary

B3 Consulting Poland is hiring a Senior iOS Developer to build a Kotlin Multiplatform mobile app for a TMS-class system and to help shape the architecture in a cross-functional team.

You will work on shared KMP layers and the native iOS SwiftUI layer, with code reviews, tests, and architectural documentation ensuring high quality and scalability.

The role is based in Warsaw and offers a chance to contribute to international projects while growing technically in a Scandinavian-influenced culture.

Qualifications

• Extensive SwiftUI experience with advanced layouts, state management, and performance optimization.
• Strong knowledge of mobile architectures: MVVM, Clean Architecture, SOLID.
• Hands-on Kotlin Multiplatform (KMP) development experience.
• English at min. B2, Polish at least C1.
• Eligibility to work in Poland.

Responsibilities

• Build a mobile application for a Transport Management System from scratch, supporting transport and logistics processes.
• Co-create a newly formed mobile task force with real impact on architecture, foundations, patterns and shared components.
• Develop the shared Kotlin Multiplatform layer and the native iOS layer in SwiftUI, including tests, code reviews and architecture documentation.

Skills

SwiftUI experience

Mobile architectures

Kotlin Multiplatform (KMP)

Swift Concurrency

English (B2)

Polish (C1)

Eligibility to work in Poland

Tools

Swift Package Manager

CI/CD (Fastlane, pipelines)

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)