Senior Android Developer (Kotlin)

TL;DR

Senior Android Developer (Kotlin): Developing and maintaining native Android applications using Kotlin, integrating shared Kotlin Multiplatform logic, and building key mobile services. Focus on implementing platform-specific features, ensuring high performance, and working with complex integrations like LMS or CRM systems.

Location: This role offers flexibility, allowing for hybrid work in Sofia, Bulgaria, or Belgrade, Serbia (2 days in-office, 3 days remote), or remote work from other locations where Constructor does not have offices.

Company

Constructor’s mission is to enable all educational organisations to provide high-quality digital education to 10x people with 10x efficiency, using machine intelligence and data science.

What you will do

• 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 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.

Requirements

• Resume must be in English.
• 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, Kotlin Coroutines, and Android SDKs.
• Proficiency with Kotlin Multiplatform Mobile (KMM), MVVM, and Clean Architecture patterns.
• Familiarity with Retrofit, Room, LiveData, StateFlow, JUnit, and Espresso.
• Experience working on projects with complex integrations, such as LMS or CRM systems.

Culture & Benefits

• Choice of work equipment (e.g., laptop, monitor).
• English classes ($130 monthly for iTalki).
• Flexible schedule (typically 09:00/10:00 and 18:00/19:00 CET or EET).
• Newborn bonus (€500 per child) and patent remuneration.
• Paid leave.
• A diverse, inclusive, and equal opportunity workplace with a gender-balanced board.