Full Stack Engineer: Kotlin & React/TS, Hybrid Contract

Talent-Relay Limited; Greater London; Hybrid; GBP 44,000 - 48,000; Full time

Job summary

Talent-Relay Limited is recruiting a Full Stack Engineer for a London contract role, mixing Kotlin backend and TypeScript/React frontends. The role offers a long-term, multi-year contract with hybrid working and a competitive day rate. The position begins with an initial contract until the end of 2026, with extension likely.

The role supports a hybrid setup in London (Victoria), with 3 days onsite and 2 days remote, and a day rate of £240–£260 inside IR35 via an accredited umbrella company.

Qualifications

• Proficient in Kotlin (or another JVM language) and TypeScript.
• Hands-on experience building React applications.
• Familiar with CI/CD pipelines and tools (GitHub Actions, Jenkins, GitLab CI).
• Working knowledge of agentic AI concepts and internal tooling.
• Clear, confident communicator—able to explain technical ideas to any audience.
• Eager to learn and thrive in a security-focused, regulated environment.

Responsibilities

• Build and run scalable backend services using Kotlin and modern JVM frameworks.
• Create fast, polished web experiences with TypeScript and React.
• Drive CI/CD: automate builds, testing, deployments, and monitoring.
• Develop and test internal AI tooling (agent orchestration, safety patterns) for engineering teams.
• Collaborate through code reviews, pair programming, and sprint planning.
• Diagnose production issues quickly and ship reliable fixes.
• Communicate progress, priorities, and trade-offs clearly across teams.

Skills

Kotlin

TypeScript

React

CI/CD pipelines

Communicator

Willingness to learn

Tools

GitHub Actions

Jenkins

GitLab CI

Docker

Kubernetes

Job description

Talent-Relay Limited is recruiting a Full Stack Engineer for a London contract role, mixing Kotlin backend and TypeScript/React frontends. The role offers a long-term, multi-year contract with hybrid working and a competitive day rate. The position begins with an initial contract until the end of 2026, with extension likely.

The role supports a hybrid setup in London (Victoria), with 3 days onsite and 2 days remote, and a day rate of £240–£260 inside IR35 via an accredited umbrella company.