Kotlin developer
Who is a Kotlin developer and why this role matters
A Kotlin developer builds server and mobile applications in JetBrains’ Kotlin language. Kotlin is the official language for Android and an increasingly popular choice for the backend with Ktor and Spring Boot.Key Kotlin developer skills
- Kotlin: coroutines, sealed classes, extensions
- Android SDK and Jetpack
- Spring Boot or Ktor for the backend
- Kotlin Multiplatform (KMP)
- Gradle and CI/CD
- Testing: JUnit, MockK
Daily responsibilities of a Kotlin developer
Developing and maintaining the core functionality
Code review and refactoring of existing code
Writing tests and technical documentation
Taking part in sprint planning and retrospectives
Integration with external services and APIs
Performance optimization and eliminating bottlenecks
Kotlin developer career path
1
Junior — learning, simple tasks, mentorship
2
Middle — independent work, complex features
3
Senior — architecture, mentorship, code review
4
Lead / Architect — the team’s technical strategy
Qualities that a Kotlin developer role develops
Analytical thinking
Independence
Teamwork
Attention to detail
Continuous learning
Pros
High demand for Kotlin developers in the job market
The ability to work remotely from anywhere in the world
Constant growth of technical skills
A competitive salary even at the start of your career
A variety of projects and tasks
Cons
The need to keep learning — technologies change fast
High competition at the junior level
Sedentary work can affect your health
Difficult debugging and hunting for non-obvious bugs
A risk of burnout during long crunches
How much a Kotlin developer earns
Junior30 000 – 44 000 UAH/mo
Middle49 000 – 71 000 UAH/mo
Senior82 000 – 121 000 UAH/mo
USA$99 000 – $148 500 per year
Germany€66 000 – €92 400 per year
Poland72 600 – 112 200 PLN per year
How Kotlin developers rate their profession
📈
Career growth
There’s a clear career ladder with the option to grow in either a technical or a management direction.
😊
Job satisfaction
Job satisfaction is high thanks to the variety of tasks and the chance to influence the product.
🛡
Stability
Demand is stable, and the technology is actively evolving and supported by the community.
Work-life balance
Okay
A steady rhythm in product teams.
Schedule: Flexible, usually 8 hours
Remote work: Available at most companies
Overtime: Moderate, depends on the project
Stress: Moderate
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