Android Developer — Kotlin, Jetpack Compose, Clean Architecture

Sigma Software; Warszawa; On-site; PLN 150,000 - 230,000; Full time

Job summary

Sigma Software is seeking a Middle Android Developer to design, develop, and maintain modern Android applications used by thousands of users worldwide. You will work with Kotlin, Jetpack Compose, and Clean Architecture, ensuring scalable, testable code and collaboration with cross-functional teams.

The role emphasizes hands-on Android expertise, strong problem-solving, and effective communication in English within an agile environment.

Qualifications

• 3+ years of commercial Android development experience.
• Strong proficiency in Kotlin and modern Android development practices.
• Hands-on experience with Jetpack Compose, Coroutines, Flow, Retrofit, and Android SDK.
• Experience with MVVM and Clean Architecture approaches.
• Solid understanding of OOP, algorithms, data structures, and design patterns.
• Experience with dependency injection and unit testing tools such as Mockito and JUnit.
• Strong analytical and problem-solving skills.
• Ability to independently drive feature development and technical solutions.
• Strong communication and collaboration skills.
• Intermediate or higher English level.
• Bachelor’s degree in Computer Science, Computer Engineering, or equivalent practical experience.

Responsibilities

• Design, develop, and maintain Android applications using Kotlin and Jetpack Compose
• Participate in architecture discussions and technical decision-making
• Refactor, optimize, and modernize existing Android codebases
• Implement scalable and maintainable features following Clean Architecture principles
• Troubleshoot and resolve application issues and performance bottlenecks
• Integrate native Android capabilities including NFC, Bluetooth, and Camera SDKs
• Collaborate with cross-functional teams including iOS engineers, QA specialists, backend developers, and product stakeholders
• Participate in all phases of the software development lifecycle
• Contribute to code quality initiatives, peer reviews, and continuous improvement processes
• Support CI/CD and engineering automation initiatives

Skills

Kotlin

Jetpack Compose

Coroutines

Flow

Retrofit

Android SDK

MVVM

Clean Architecture

OOP

algorithms

data structures

design patterns

dependency injection

Mockito

JUnit

Education

Bachelor’s degree in Computer Science or related field

Tools

Mockito

JUnit

Job description

Sigma Software is seeking a Middle Android Developer to design, develop, and maintain modern Android applications used by thousands of users worldwide. You will work with Kotlin, Jetpack Compose, and Clean Architecture, ensuring scalable, testable code and collaboration with cross-functional teams.

The role emphasizes hands-on Android expertise, strong problem-solving, and effective communication in English within an agile environment.