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Offer summary
(Summary generated by AI based on the full job description)
The project focuses on evolving a large, multi-market mobile application. Core stack includes Kotlin, Java and Kotlin Multiplatform. Required knowledge of MVVM, Clean Architecture and SOLID, plus experience with CI/CD and Git. Responsibilities cover designing and implementing native Android features, writing testable code, performing code reviews, improving architecture and introducing new technologies. Requires 6+ years of Android experience and fluency in Polish and English.
from: 3 November 2026
to: 3 December 2026
salary not specifiedB2B contract (full-time)
salary not specifiedcontract of employment
Offer parameters
level:senior
working mode:remote • hybrid • full office
Białystok, Centrum
Requirements
Expected technologies
Kotlin Multiplatform (KMP)
Android
Kotlin
Java
CI/CD
Git
Model-View-ViewModel (MVVM)
SOLID Principles
Our requirements
- At least 6 years of professional experience in Android development, with strong hands-on skills in Kotlin and Java
- Practical, hands-on experience with Kotlin Multiplatform
- Solid understanding of mobile architecture and software design principles, including MVVM, Clean Architecture, and SOLID
- Experience with CI/CD processes and good working knowledge of Git
- Understanding of mobile UI/UX principles and Material Design, combined with experience working in Agile, cross-functional teams
- Fluent Polish and English, both written and spoken
- Current residence in Poland
Your responsibilities
- Design, develop, and enhance native Android application features with a focus on quality, scalability, and maintainability
- Write well-tested code and actively contribute to technical and architectural decisions
- Review code and support consistent engineering standards and development best practices
- Work closely with cross-functional teams throughout the design and delivery of new functionalities
- Refactor and improve existing solutions to strengthen application architecture and code quality
- Explore and introduce technologies and development approaches that can improve engineering efficiency
About the project
We are looking for an experienced Android Developer to join a team responsible for developing and evolving a large-scale mobile product used by customers across multiple European markets. You will have a real impact on the technical direction of the application, contribute to architectural and development decisions, and help improve engineering practices. The role combines hands-on Android development with close cooperation across functions and a strong focus on clean, maintainable, and scalable solutions.
What we offer
- Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas
- Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market
- We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022
- Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more
- Comfortable workplace – class A offices or remote work
- Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application
- PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers
- Investment in your growth – meetups, webinars, training platform and technology blog – you choose
- Fantastic atmosphere created by all Sii Power People
Recruitment stages
- 1.Send your CV
- 2.Talk to us about your expectations
- 3.Learn more about our projects and choose the best
- 4.Start your adventure with Sii!
Sii Sp. z o.o.
Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment.
Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.
This is how we work
Senior Android Developer with Kotlin Multiplatform (f/m/x)
I apply to:
Sii Sp. z o.o.
Białystok, Centrum
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