Android Developer (Construction Tech)

Sigma Software

23h

About The Position

Join a product-focused team developing modern mobile solutions used daily by hundreds of thousands of users across construction sites worldwide. Sigma Software collaborates closely with a sustainable European customer headquartered in Sweden to build digital products that improve workforce management, operational efficiency, and worker safety. The role is part of a mature engineering environment with strong technical expertise and close integration into the customer’s organization, focused on long-term product development and business-critical solutions that integrate software and hardware technologies. The project builds mobile and web products for workforce presence tracking and access management on construction sites worldwide. Its platform combines software with physical devices, enabling users to register entrances and exits, remotely unlock doors, and interact with construction machinery through mobile applications. The product serves hundreds of thousands of active users daily and emphasizes maintainability, scalability, and continuous improvement. The Android Developer designs, develops, and maintains applications using Kotlin and Jetpack Compose; contributes to architecture and technical decisions; modernizes and optimizes existing code; and delivers scalable features following Clean Architecture. The role also involves troubleshooting and performance improvements, integrating native capabilities such as NFC, Bluetooth, and camera SDKs, collaborating with cross-functional teams, participating throughout the software development lifecycle, improving code quality through reviews, and supporting CI/CD and engineering automation.

Requirements

At least 3 years of commercial experience in Android development.
Good knowledge of 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 software engineering fundamentals, including 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 take ownership of features and drive their development independently.
Strong communication and collaboration skills.
Intermediate or higher English level.
Bachelor’s degree in Computer Science, Computer Engineering, or equivalent practical experience.

Nice To Haves

Experience with Java, XML, and Android Data Binding.
Experience modernizing legacy Android applications.
Migration experience from XML-based UI to Jetpack Compose.
Experience transitioning legacy navigation approaches to Navigation Compose.
Experience with CI/CD pipelines and release automation.
Scripting and process automation experience.
Experience using AI-assisted engineering tools in development workflows.
Portfolio of published Android applications on Google Play or GitHub.

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 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.