Languages & Frameworks · Skill guide
Kotlin is now the required language on most Android postings and increasingly appears in backend JDs (Ktor, Spring) — resumes should signal which Kotlin lane they occupy, since the two keyword clusters barely overlap.
It appears in 4% of 2,367 engineering postings in our 15 August 2026 snapshot .
Job descriptions rarely ask for Kotlin alone — these co-terms appear in the same postings and are screened together. Cover the ones you've genuinely used.
Public ATS boards (Arbeitnow, Greenhouse, Ashby, Google Careers, Lever, RemoteOK, Remotive). Not LinkedIn or Indeed. Percentages are share of postings that already mention Kotlin.
A skill in a list is a claim; a skill in a bullet with an outcome is evidence. Patterns to adapt with your real numbers:
“Built Android features in Kotlin with Jetpack Compose and coroutines-based data layers for an app serving 2M monthly users”
“Migrated 60% of a Java Android codebase to Kotlin, cutting NullPointerException crash groups by 80%”
Put "Kotlin" in your skills section in its exact form, then prove it in at least one experience bullet with context and an outcome — a skill that appears only in a list reads as padding to recruiters. Kotlin is now the required language on most Android postings and increasingly appears in backend JDs (Ktor, Spring) — resumes should signal which Kotlin lane they occupy, since the two keyword clusters barely overlap.
Job descriptions that ask for Kotlin typically also screen for: Java, AWS, Python, Kubernetes, TypeScript. Include the ones you've genuinely used — co-keyword coverage is how ATS ranking separates real practitioners from list-padders.
List it only if you could answer interview questions about it comfortably. A safer honest framing for light experience is grouping it under a "familiar with" tier, separate from your core skills — inflated skill claims surface fast in technical interviews.
Paste a job description that requires it — RoleTuner shows whether your resume surfaces Kotlin and its co-keywords the way an ATS reads them, free.