What the role involves
Build Android applications or JVM backend services. Make your target platform explicit and show structured concurrency in practice.
Skills to highlight
- Kotlin
- coroutines
- Flow
- Gradle
- testing
For Kotlin developer vacancies, start with Kotlin, coroutines and Flow. Match the exact stack to the employer and support every claimed skill with a project, decision or measured result.
What to show in your portfolio
A coroutine-based feature with cancellation and automated tests.
For a Kotlin developer portfolio, explain why you chose Kotlin and coroutines, show how the result was verified and document one limitation or trade-off. Share only material you may publish.
Find the right level
Junior
Show the fundamentals of Kotlin and coroutines in a small finished project such as: A coroutine-based feature with cancellation and automated tests Explain setup, tests and what you changed after feedback.
Middle
Demonstrate independent delivery as a Kotlin developer: turn a requirement into a working result, handle edge cases involving coroutines and Flow, and support the solution after release.
Senior
Show ownership of architecture, risk and team decisions around Kotlin, coroutines, Flow. Explain impact, operational limits and how you helped other specialists make better decisions.
What to prepare for an interview
Build a short story around your example: A coroutine-based feature with cancellation and automated tests Be ready to connect the result to the following areas rather than only defining terms.
- Prepare one Kotlin developer example where Kotlin changed a design, debugging or validation decision.
- Prepare one Kotlin developer example where coroutines changed a design, debugging or validation decision.
- Prepare one Kotlin developer example where Flow changed a design, debugging or validation decision.
- Prepare one Kotlin developer example where Gradle changed a design, debugging or validation decision.
- Prepare one Kotlin developer example where testing changed a design, debugging or validation decision.
How to approach your job search
- Search for Kotlin developer roles and compare responsibilities, not only the title. Include Swift developer, Dart / Flutter developer, Android developer when the vacancy overlaps those areas.
- Adapt your CV to the vacancy using accurate evidence for Kotlin, coroutines and Flow; remove technologies you cannot discuss in depth.
- Prepare the portfolio example “A coroutine-based feature with cancellation and automated tests” as a concise problem–action–result story and record the questions you receive in interviews.
Before you apply
Which skills matter most for a Kotlin developer?
Start with Kotlin, coroutines and Flow, then compare the employer’s product and stack. The strongest CV names fewer skills but connects each one to evidence.
What can replace commercial Kotlin developer experience?
A finished and reviewable project can demonstrate useful evidence. A strong starting example is: A coroutine-based feature with cancellation and automated tests Label personal, academic and open-source work accurately and state your own contribution.