Android Developer (Construction Tech)

Company DescriptionJoin 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.We at Sigma Software collaborate closely with a sustainable European Customer headquartered in Sweden to build digital products that improve workforce management, operational efficiency, and worker safety. You will become part of a mature engineering environment with strong technical expertise and close integration into the Customer’s organization.This is an opportunity to work on long-term product development, contribute to business-critical solutions integrating software and hardware technologies, and grow alongside experienced Middle and Senior engineers.CUSTOMEROur 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.PROJECTThe 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.Job DescriptionDesign, develop, and maintain Android applications using Kotlin and Jetpack ComposeParticipate in architecture discussions and technical decision-makingRefactor, optimize, and modernize existing Android codebasesImplement scalable and maintainable features following Clean Architecture principlesTroubleshoot and resolve application issues and performance bottlenecksIntegrate native Android capabilities including NFC, Bluetooth, and Camera SDKsCollaborate with cross-functional teams including iOS engineers, QA specialists, backend developers, and product stakeholdersParticipate in all phases of the software development lifecycleContribute to code quality initiatives, peer reviews, and continuous improvement processesSupport CI/CD and engineering automation initiativesQualifications3+ years of commercial experience in Android developmentStrong proficiency in Kotlin and modern Android development practicesHands-on experience with Jetpack Compose, Coroutines, Flow, Retrofit, and Android SDKExperience with MVVM and Clean Architecture approachesSolid understanding of software engineering fundamentals, including OOP, algorithms, data structures, and design patternsExperience with dependency injection and unit testing tools such as Mockito and JUnitStrong analytical and problem-solving skillsAbility to independently drive feature development and technical solutionsStrong communication and collaboration skillsIntermediate or higher English levelBachelor’s degree in Computer Science, Computer Engineering, or equivalent practical experienceWILL BE A PLUSExperience with Java, XML, and Android Data BindingExperience modernizing legacy Android applicationsMigration experience from XML-based UI to Jetpack ComposeExperience transitioning legacy navigation approaches to Navigation ComposeExperience with CI/CD pipelines and release automationScripting and process automation experienceExperience using AI-assisted engineering tools in development workflowsPortfolio of published Android applications on Google Play or GitHubAdditional InformationPERSONAL PROFILEProactive and ownership-driven mindsetStrong collaboration and communication skillsAttention to code quality and maintainabilityAbility to work effectively in agile distributed teamsInterest in modern mobile technologies and continuous improveme