Web & Backend · India

Hire Kotlin Backend Developers

Senior Kotlin backend engineers building coroutine-first APIs and microservices with Ktor, Spring Boot, or Quarkus on the JVM, with discipline on structured concurrency.

Hire a Kotlin Backend Developer See All 46 Roles

Skill Set

What our Kotlin Backend Developers know cold

Every engineer you hire from RG INSYS is benchmarked on these areas before they touch your codebase.

Kotlin Core

Kotlin 1.9+, coroutines, structured concurrency
Flow, channels, SharedFlow patterns
Multiplatform Kotlin where it fits
Type-safe builders and DSLs

Frameworks

Ktor 3 with WebSockets and gRPC
Spring Boot 3 with Kotlin idioms
Quarkus for native compilation
Arrow for functional error handling

Data Layer

Exposed, jOOQ, R2DBC, JPA
PostgreSQL, MySQL, MongoDB
Kafka with Reactor / coroutines
Redis caching and event streams

Operations

JVM tuning for low GC pause times
Docker and Kubernetes deployments
OpenTelemetry, Micrometer, Prometheus
Native image builds with GraalVM

What They Build

Real work delivered, not hypothetical

High-throughput coroutine APIs with Ktor and Spring Boot
Kotlin gRPC microservices on Kubernetes
Event-driven systems on Kafka with reactive streams
Migration from Java backends to Kotlin without rewrites
Multi-tenant SaaS APIs with row-level tenancy
GraalVM native image builds for sub-second cold start

Sample Engagements

Recent Kotlin Backend Developer work at RG INSYS

Built a Ktor + Kafka order-processing service for a UAE logistics operator handling 14K orders/min at P99 of 80ms.

Migrated a Java 8 Spring monolith to Kotlin + Spring Boot 3 modular monolith for a UK insurance broker, cutting build time from 12 to 3 minutes.

Shipped a coroutine-based pricing service for a US retail SaaS, replacing a Node.js service with 5× lower latency.

How hiring works

From brief to working Kotlin Backend Developer in five steps

You choose who joins your team. We handle sourcing, contracts and backup cover.

01
Share your requirements
Tell us the stack, seniority, timezone and start date. We sign an NDA before you share anything sensitive.
02
Get a shortlist in 48 hours
We send 2 to 3 Kotlin Backend Developer profiles matched to your brief within 48 hours of the signed NDA.
03
Interview and choose
Run your own technical interview or code exercise, then pick the engineer you want.
04
Start in 5 to 10 working days
Your engineer joins your Slack, Jira and GitHub with at least 4 hours of overlap with your team.
05
2 week free trial
Pay nothing for the trial if you do not continue. Not the right fit? We replace the engineer at no cost.

Scope growing? Add frontend, backend, DevOps or QA engineers under one tech lead with the Dedicated Team model, without re-explaining the project. Start with step 1.

Engagement Models

Three ways to hire your Kotlin Backend Developer

Switch models anytime. No long term lock in. 2 week free trial available.

Hourly

From $34/hr

For short tasks, code reviews, urgent fixes, or proofs of concept.

Minimum 20 hours/week
Weekly time tracking and reporting
Cancel anytime with 1 week notice

A Kotlin Backend Developer who works alongside AI from day one

Hiring a Kotlin Backend Developer from RG INSYS is different from a typical staffing engagement. Every engineer on our bench uses Claude Code, Cursor IDE, and GitHub Copilot daily. That is not a sales line, it is a hard requirement on day one of the contract.

For you that means three things. Faster shipping: the AI handles the boilerplate so the engineer focuses on architecture, edge cases, and your domain. Lower cost: you get senior India-based engineers at the rate of UK or US juniors. Higher quality: AI-generated tests run on every PR before human review.

If the engineer is not the right fit in the first 2 weeks you pay nothing for the trial period and we replace them at no cost. NDAs are signed before any disclosure and full IP is assigned to you, the code lives in your repos under your accounts.

FAQ

Common questions about hiring a Kotlin Backend Developer

How quickly can a Kotlin Backend Developer start?

For most Kotlin Backend Developer roles we send a 2 to 3 person shortlist within 48 hours of a signed NDA. The chosen engineer typically starts within 5 to 10 working days.

Can your engineers work on both Kotlin and Java codebases?

Yes. All our Kotlin Backend Developers are also fluent in modern Java (21 with records, sealed types, pattern matching). Mixed Kotlin/Java codebases are common in our work.

Do you work with Ktor or Spring Boot?

Both. Default for greenfield is Ktor for its lighter footprint; Spring Boot when the team or surrounding system demands it. Quarkus for native-image hot paths.

Can the Kotlin Backend Developer work in our timezone?

Yes. Engineers commit to a flexible 8 hour day with at least 4 hours overlap with your team. UK, EU, US East/West, UAE, and Australia are all supported.

Do you replace the engineer if it's not a fit?

Yes. The first 2 weeks are a free trial. If you decide not to continue, you pay nothing for the trial and we replace the engineer at no cost.

Who owns the IP and the code?

You do. Every engagement includes a full IP assignment clause and an NDA. The code lives in your repos, on your infrastructure, under your accounts. We do not retain copies after handover.

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Free shortlist within 48 hours

Ready to hire your
Kotlin Backend Developer?

Tell us the role, stack, and timezone. We'll send a 2 to 3 person shortlist with CVs, GitHub, and rates within 48 hours. Free 2 week trial available.

Hire a Kotlin Backend Developer

Typical response within 4 business hours · NDA on request before any disclosure