Senior Android Developer

Constructor's mission is to enable all educational organisations to provide high-quality digital education to 10x people with 10x efficiency. 

With strong expertise in machine intelligence and data science, Constructors all-in-one platform for education and research addresses today's pressing educational challenges: access inequality, tech clutter, and low engagement of students.

Our headquarters is located in Switzerland, and we also have legal entities in Germany, Bulgaria, Serbia, and Singapore

We're embarking on an ambitious journey to create two game-changing mobile applications that will transform how people learn and collaborate.

DUTIES & RESPONSIBILITIES:

• Develop and maintain native mobile applications for Android using Kotlin 
• Collaborate with the team to integrate shared Kotlin Multiplatform logic across platforms 
• Build key mobile services such as notifications, communication hub, calendar, and online calls 
• Implement platform-specific features and user interface designs while ensuring high performance 
• Perform regular code reviews and ensure clean architecture principles (MVVM, Clean Architecture) 
• Write unit and integration tests to maintain code quality and reliability 
• Work with backend services to ensure seamless data integration and syncing between apps and external APIs 

QUALIFICATIONS & EXPERIENCE:

• At least 2 years of experience in native Android app development using Kotlin 
• Strong understanding of OOP, SOLID principles, and design patterns 
• Experience working with RESTful APIs and integrating external services 
• Proficiency with Kotlin Coroutines for asynchronous programming 
• In-depth knowledge of Android SDKs, libraries, and best practices for performance optimization 
• Experience with Kotlin Multiplatform or hybrid app development 
• Familiarity with architecture patterns (BLoC, MVVM, Clean Architecture) 
• Experience working on projects with complex integrations, such as LMS or CRM systems 
• Programming Languages: Proficiency in Kotlin and Java 
• Frameworks and Libraries:  
• Experience with Kotlin Multiplatform Mobile (KMM) for shared logic 
• Familiarity with MVVM and Clean Architecture patterns 
• Proficiency in Retrofit, Room, LiveData, and StateFlow 
• Development Tools: Android Studio, Gradle, Git 
• Testing: JUnit, Espresso 

Imagine an app that puts the power of a world-class education in the palm of your hand. Constructor products cover all facets of learning from self-education with AI to online teaching. In the app they will be unified to become the go-to platform for learners of all ages and backgrounds. 

Key Features: 

• Seamless access to a rich catalog of courses 
• Interactive learning experiences with text, video, and quizzes 
• Personalized learning paths and progress tracking 
• Integration with calendars for efficient study planning 
• Offline mode for learning anytime, anywhere 
• Powerful AI for all learning purposes
• Online calls for lectures and practice in education

Why This Project Matters 

In today's fast-paced world, education must be accessible, engaging, and adaptable. Our project aims to: 

• Break down barriers to quality education 
• Cater to the growing mobile-first audience 
• Provide cutting-edge tools for educators and learners alike 
• Foster a global community of lifelong learners 

The Tech Behind the Magic 

We're adopting a hybrid approach, combining the best of native mobile development and web technologies: 

• Kotlin Multiplatform (KMP) for shared business logic, maximizing efficiency 
• Swift and Kotlin for platform-specific features, delivering the best possible user experience 
• Provide the development of cutting-edge mobile apps for Android 
• Craft intuitive user interfaces that make learning a joy 
• Integrate cool features like real-time communication, interactive polls, and virtual breakout rooms 
• Ensure our apps are fortress-level secure and privacy-compliant

• Choice of work equipment (e.g., laptop, monitor, etc.)
• English classes (iTalki – $130 monthly)
• Flexible schedule (we usually work between 09:00/10:00 and 18:00/19:00 CET or EET)
• Newborn bonus (€500 per child)
• Patent remuneration
• Paid leave
• Remote work in locations without our offices
• Hybrid work in locations with offices (2 days in-office, 3 days remote):
  • Sofia: 59 G. M. Dimitrov Blvd., NV Tower, 8th floor, 1700
  • Belgrade: Makedonska 12, 11000 Belgrade, Serbia

Constructor fosters equal opportunity for people of all backgrounds and identities. We are led by a gender-balanced board committed to building a diverse and inclusive organisation where everyone can become their best self. We do not discriminate based on age, disability, gender identity, sexual orientation, ethnicity, race, religion or belief, parental and family status, or other protected characteristics. We welcome applications from women, men and non-binary candidates of all ethnicities and socio-economic backgrounds. We encourage people belonging to underrepresented groups to apply.