Full Stack Engineer – Kotlin, React / Typescript – Contract – London

Talent-Relay Limited; Greater London; On-site; 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

Full Stack Engineer – Kotlin, React / Typescript – Contract – London

Dan Dorrington

Category :

Contract

Posted On :

March 25, 2026

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Job Title: Full Stack Engineer – Kotlin, React / Typescript

Location: London, Victoria

Working setup: Hybrid – 3 days per week onsite / 2 days remote

Job Type: Contract – Long term / multi-year

Day Rate: £240 – £260 per day (inside IR35) Via an acredited Umbrella company

Industry Sector: Financial Services,

Candidates must have the right to work in the United Kingdom

Introduction:

Talent-Relay has partnered with a global player in the financial services sector to urgently on-board an experienced Full Stack Engineer with experience of Kotlin, React / Typescript into a project team, building secure, scalable customer‑facing services.

Successful candidate will join the team on an initial contract until the end of 2026, with extension highly likely.

The successful Full Stack Developer will work across Kotlin backend services and TypeScript/React frontends, contribute to CI/CD pipelines, and leverage agentic AI tooling. This role emphasises collaboration, learning, and clear communication with cross‑functional teams.

Key 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.

Required Qualifications, Skills and Experience:

• 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.

Nice to have:

• Experience with cloud platforms (AWS, GCP, or Azure).
• Familiar with containers and orchestration (Docker, Kubernetes).
• Understanding of secure coding and data privacy/anonymisation practices.
• Internship or project experience in fintech or insurance.