Hire Kotlin Developers · London
Hire Kotlin Developers in London
Kotlin developers for London teams, where almost every real codebase is part Java. Kotlin was designed to interoperate, so it is adopted incrementally into existing projects — which means a Kotlin developer who cannot comfortably read and modify Java will struggle with a substantial part of the work in front of them.
Why this comes up
The problem
The codebase is half Java and the new Kotlin developer avoids touching any of it.
What you get
What we deliver
- Java competence confirmed, since mixed codebases are the norm rather than the exception
- Interoperability understanding tested, particularly around nullability at the boundary
- Coroutine experience assessed where your project uses them
- Platform established clearly, as Android and server-side Kotlin are different work
- Null safety practice examined, because it is the language's main proposition
- Build tooling familiarity checked, given how much Kotlin projects depend on it
Want this scoped for your business in London?
Thirty minutes, no charge, no sales script. You leave with a written summary of what hire kotlin developers would actually involve — whether or not you use us.
Working in London
London
London clients usually come to us because they want senior people actually on their project rather than a large agency's B team, and because Midlands rates buy considerably more delivery per pound.
Clients here are usually replacing an agency, and want senior people on the work at rates that are not Central London rates.
Sectors we work with in London
- Financial Services
- Professional Services
- Technology
- Media
- Hospitality
- Retail
What we work with
Technologies and platforms
- Kotlin
- Java
- Spring Boot
- Gradle
Who we work with
Industries we serve
- Financial services
- Technology companies
- Retail
- Telecommunications
- Enterprise software
Why us
Why London businesses choose Asionis
- Projects typically launched within 4–8 weeks
- No long-term contracts required
- All team members UK-based
- Dedicated account manager and development team
- Transparent reporting with monthly performance metrics
- Scalable from startup to enterprise
How we work
- Step 1
Free consultation
A 30-minute call to understand the problem. You keep the written summary either way.
- Step 2
Proposal
Scope, timeline and a fixed price, in writing, before anything starts.
- Step 3
Build
Short cycles with regular check-ins, so you see progress rather than hear about it.
- Step 4
Launch and support
We handle the go-live and stay available afterwards.
Other services in London
Looking for the full picture? See our Hire Kotlin Developers services, everything we do in London or browse everything we do.
Hire Kotlin Developers in London — common questions
- Why does Java competence still matter?
- Because the existing code is Java. Adoption is almost always incremental, so a developer works across both languages daily — and somebody who avoids the Java portions is effectively unable to work on half the system they were hired for.
- What breaks at the boundary?
- Nullability, most often. Java types arriving in Kotlin carry no null information, so the compiler's guarantees stop at the boundary — and a developer who does not understand that writes code that appears null-safe and fails at runtime.
- Are Android and server Kotlin the same skill?
- The language is shared and little else. Android brings lifecycle, UI and platform concerns; server-side brings frameworks, persistence and deployment — so stating which you need avoids candidates whose experience is entirely in the other.
- How important are coroutines?
- Where your project uses them, considerably. They are Kotlin's approach to asynchronous work and they have their own concepts around scope and cancellation, so somebody who has only written synchronous Kotlin will need time with them.
- Do you work with businesses across Greater London?
- Yes. We are based in Leicester, United Kingdom and work with clients throughout London, including London and the surrounding Greater London area. Most collaboration happens remotely, and we travel for kick-offs and key milestones.
- What kind of London businesses do you usually work with?
- Clients here are usually replacing an agency, and want senior people on the work at rates that are not Central London rates. Beyond that we work across Financial Services, Professional Services, Technology, Media, Hospitality and Retail.
- Do you cover the areas around London?
- Yes — we work throughout London, including Reading, Milton Keynes, Cambridge, Brighton. London is an urban area of roughly 9,000,000+, and we take on work across the wider Greater London region rather than the city boundary alone.
Talk to us about Hire Kotlin Developers in London
A 30-minute call with someone who would actually work on it. No sales script, no obligation.
- Projects typically launched within 4–8 weeks
- No long-term contracts required
- All team members UK-based
- Dedicated account manager and development team
- Transparent reporting with monthly performance metrics
- Scalable from startup to enterprise