Senior Android Developer (Kotlin & Kotlin Multiplatform)

Our mission

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, Constructor's 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

Please send your resume in English only.

We're seeking a talented Android Developer to join our innovative team in creating cutting-edge educational apps: Constructor Learn and Constructor Groups. You'll play a crucial role in developing high-performance Android applications that will revolutionise mobile learning experiences.

Responsibilities:

• Develop and maintain native mobile applications for Android using Kotlin
• Build key mobile services such as notifications, a communication hub, a 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
  
  

Required Experience:

• At least 5+ 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 optimisation
  
  

Preferred Qualifications:

• Familiarity with architecture patterns (BLoC, MVVM, Clean Architecture)
• Experience working on projects with complex integrations, such as LMS or CRM systems
  
  

Technical Skills

• Programming Languages: Proficiency in Kotlin and Java
• Frameworks and Libraries:
• Familiarity with MVVM and Clean Architecture patterns
• Proficiency in Retrofit, Room, LiveData, and StateFlow
• Development Tools: Android Studio, Gradle, Git
• Testing: JUnit, Espresso
  
  

Technology Stack:

• Frameworks: Jetpack Compose or XML for UI
• Libraries: Retrofit (API integration), Room (local database), LiveData / StateFlow (state management)
• Tools: Android Studio, Gradle, Git
• Testing: JUnit, Espresso
  
  

About the Product

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 catalogue of courses
• Interactive learning experiences with text, video, and quizzes
• Personalised 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
  
  

What We Offer

• 💻 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.