Android Developer (Construction Tech)
Join a product-focused team developing modern mobile solutions used daily by hundreds of thousands of users across construction sites worldwide. We are looking for a Middle Android Developer who is passionate about scalable mobile applications, clean architecture, and modern Android technologies.
Customer
Our Customer is a sustainable European product company headquartered in Sweden that develops digital solutions for workforce and construction site management. The company focuses on improving operational efficiency and worker safety through connected mobile applications and smart physical devices. Sigma Software engineers work as an integrated part of the Customer’s agile product organization.
Project
The project focuses on building mobile and web products for workforce presence tracking and access management on construction sites worldwide. The platform combines software products with physical devices, allowing users to register entrances and exits, remotely unlock doors, and interact with construction machinery directly from mobile applications.
The product is business-critical and continues to scale rapidly, serving hundreds of thousands of active users daily. The engineering team follows modern Android development practices with a strong focus on maintainability, scalability, and continuous improvement.
Requirements
- 3+ years of commercial experience in Android development
- 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 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 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
WILL BE A PLUS:
- 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 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