Kotlin Developer Salary UK 2026
Last updated: March 2026 • 7 min read • Written by: ClickMasters HR Team • Reviewed by: Reviewed annually
Direct Answer
Kotlin Developer salaries range from £30,000 to £780–£1,120/day. Kotlin with Jetpack Compose (Android UI toolkit — declarative UI replacing XML layouts) commands premium. Kotlin with Kotlin Multiplatform (KMP — shared Kotlin business logic with iOS Swift UI) commands growing premium as KMP adoption increases in UK enterprise. Kotlin with NHS Android App integration (NHS Login on Android, DTAC Android compliance) commands NHS premium. Kotlin backend (Spring Boot Kotlin — replacing Java Spring Boot in UK enterprise) commands premium for senior engineers comfortable in JVM server-side context.
Market Outlook
Kotlin Developers write Android mobile applications and JVM backend services. Kotlin is the official Android development language (replacing Java) — all new Android development in UK should be Kotlin not Java. Kotlin Multiplatform (KMP) — sharing business logic between Android and iOS — is growing in 2026 but not yet mainstream.
Salary benchmarks by Seniority
IR35 Tax Position
Day rates assume outside IR35. Inside IR35 contractor day rates in the UK are typically 15–25% higher to compensate for the lack of tax efficiency and additional payroll costs. ClickMasters engineers are directly employed by us, representing **zero IR35 risk** for clients.
Frequently Asked Questions
Everything you need to know about kotlin developer salary standards.
Approximately £85,000–£128,000 mid-level. London +20–30%.
Other Technology Salary Guides
Keep up-to-date with permanent compensation benchmarks and contractor day rates in the UK.
Software Developer Salary UK 2025 — Complete Benchmark Guide
Comprehensive UK software developer salary benchmarks 2025. By role, city, experience, technology stack. IR35 inside vs outside comparison. Junior to CTO. Free guide.
Kotlin Developer Salary UK 2025
Kotlin Developer salary UK 2025.
React Developer Developer Salary UK 2025
React Developer developer salary UK 2025. By seniority, city, contract vs permanent. IR35 analysis. Day rates included. Free guide.
Python Developer Developer Salary UK 2025
Python Developer developer salary UK 2025. By seniority, city, contract vs permanent. IR35 analysis. Day rates included. Free guide.
Scale Your Engineering Team Without IR35 Surcharges
We deliver senior software engineers, data scientists, and cloud architects within 2 weeks on simple, rolling contracts.
Get a Custom Rate Quote