Kotlin test for interview: free practice with answers
What a Kotlin screening round looks like, five sample questions in the same style, and the full free test with every answer explained.
What the real round usually looks like
Most Kotlin interview tests are ten to twenty multiple-choice questions, sometimes followed by a short practical task. The pass mark on this site is 80%, and Kotlin is commonly screened for Android developer roles and for some backend roles on the JVM. Requirements vary by employer, so treat the benchmark as a floor.
Try the sample
Kotlin: 5 interview-style questions
5 questions · instant feedbackHow to prepare in three days
- Take the full test once to find the gap.
- Read the lesson that matches the gap and retake the next day.
- Read the Kotlin interview questions aloud so you can explain your score.
Common questions
Do I need to know Java before Kotlin?
No, but it helps to know that Kotlin runs on the JVM and can call Java code directly. Many Android projects mix both languages, so being able to read basic Java is useful.
How much coroutine knowledge do screenings expect?
Usually the basics: what a suspend function is, the difference between launch and async, and why long work should not run on the main thread. Advanced Flow operators are rarely part of entry-level tests.
Is using !! ever acceptable?
It compiles, but it throws a NullPointerException when the value is null, which defeats null safety. Prefer ?., ?:, let or an early return, and treat !! as a sign the code needs another look.
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