Senior Android Developer (f/m/x)

Sii Poland; Białystok; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Great Place to Work

Centre of internal trainings

Profit sharing

Medical care

Open and accessible management team

MySii app

Job summary

Sii Poland is seeking a Senior Android Developer to design, build, and improve high-performance mobile apps in a dynamic, international team. You will contribute to architecture decisions, implement scalable features, and ensure code quality through reviews and testing.

Join a long-term product initiative in logistics and digital services, working with Kotlin, Jetpack Compose, and modern Android SDKs to deliver user-centric solutions for millions of users.

Qualifications

• 6+ years of commercial experience in Android application development.
• Strong proficiency in Kotlin and hands-on experience with the Android SDK.
• Practical experience building modern user interfaces with Jetpack Compose.
• Solid knowledge of asynchronous programming and concurrency using Coroutines.
• Experience with automated testing, CI/CD practices, and maintaining scalable mobile applications.
• Fluent communication skills in Polish and English.

Responsibilities

• Designing, developing, and maintaining advanced Android applications with a focus on performance, stability, and responsiveness.
• Enhancing existing solutions through refactoring, code optimization, and continuous architectural improvements.
• Building and maintaining automated CI/CD pipelines to streamline development, testing, and release processes.
• Delivering high-quality, testable, and maintainable code while contributing to technical decision-making.
• Participating in code reviews and promoting engineering standards, best practices, and software quality.
• Creating and maintaining technical documentation to support development and operational processes.

Skills

Android development

Kotlin

Jetpack Compose

Coroutines

CI/CD

Testing

Polish

English

Android Studio

Git

Tools

Android Studio

Git

Job description

Join a long-term product development initiative in the logistics and digital services sector, focused on creating mobile solutions that support millions of everyday users. As a Senior Android Developer, you will play a key role in designing, building, and improving high-performance mobile applications, working closely with cross-functional teams in an agile environment. This position offers the opportunity to influence technical decisions, contribute to software architecture, and help deliver reliable, scalable, and user-centric products.

Your tasks

• Designing, developing, and maintaining advanced Android applications with a focus on performance, stability, and responsiveness
• Enhancing existing solutions through refactoring, code optimization, and continuous architectural improvements
• Building and maintaining automated CI/CD pipelines to streamline development, testing, and release processes
• Delivering high-quality, testable, and maintainable code while contributing to technical decision-making
• Participating in code reviews and promoting engineering standards, best practices, and software quality
• Creating and maintaining technical documentation to support development and operational processes

Requirements

• At least 6 years of commercial experience in Android application development
• Strong proficiency in Kotlin and hands-on experience with the Android SDK
• Practical experience building modern user interfaces with Jetpack Compose
• Solid knowledge of asynchronous programming and concurrency using Coroutines
• Experience with automated testing, CI/CD practices, and maintaining scalable mobile applications
• Fluent communication skills in both Polish and English, enabling effective collaboration in an international environment

Job no. JOB-MDN2P

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

Benefits For You

• Great Place to Work
• Solid financial situation
• Contracts with the biggest brands
• Centre of internal trainings
• Many experts you can learn from
• Open and accessible management team
• Profit sharing
• Passion Sponsorship program
• Regular integration events and trips
• Comfortable and well-equipped offices
• MySii app
• Medical care