Kotlin
Kotlin drills cover what interviewers actually probe — null safety, data and sealed classes, higher-order functions, coroutines and Flow, collections, generics variance, Java interop, and Android idioms. From fresher foundations to staff-level coroutine internals and DSL design, all at your pace.
What this skill is about
Kotlin drills cover what interviewers actually probe — null safety, data and sealed classes, higher-order functions, coroutines and Flow, collections, generics variance, Java interop, and Android idioms. From fresher foundations to staff-level coroutine internals and DSL design, all at your pace.
Topics we drill
- Language Fundamentals
- Functions Lambdas & Higher-Order
- Coroutines & Flow
- Collections & Sequences
- Generics & Variance
- Java Interoperability
- DSLs & Extension Functions
- Android Kotlin Basics
- Testing
- Performance & Internals
Why this matters at interviews
Real interviewers don’t just check if you know the syntax — they probe whether you’ve used the concept under production pressure. Our drills mirror that. Adaptive difficulty, named anti-patterns called out as you go, and a senior-staff voice that teaches the production vocabulary rather than dumbing it down.