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# Senior Full Stack Developer (Kotlin, React) - Banking - London

- **Company:** Salt Search Ltd.
- **Location:** London, UK
- **Experience:** Expert
- **Contract:** Temporary contract
- **Skills:** Java (Programming Language), Artificial Intelligence, Software Quality, Continuous Integration, DevOps, Iterative and Incremental Development, Java Virtual Machine (JVM), Object-Oriented Software Development, Pair Programming, Software Engineering, TypeScript, Trunk-based Development, Test-Driven Development (TDD), GitHub Copilot, ReactJS, Kotlin, Extreme Programming, Front End Software Development, Functional Programming
- **Published:** September 17, 2026
- **Apply:** https://www.totaljobs.com/job/senior-full-stack-developer/salt-job107991163

## About the Role

* Kotlin development, or experience in Java/Scala and a desire to cross train

 * TypeScript and ReactJS with experience using a JVM language on the server side (10+ years of professional software development)

 * Strong grounding in Object-Oriented and/or Functional programming concepts

 * Proven use of XP/agile practices: TDD, acceptance testing, pair programming, continuous integration

 * Experience applying iterative development to deliver high-value outcomes in complex domains

 * Experience using AI development tools such as GitHub Copilot as part of an iterative, human-in-the-loop workflow. We value developers who use Copilot to accelerate small, frequent iterations, rather than delegating decisions to AI.

 * Familiarity with CI/CD, observability, and operating production systems

*Rates depend on experience and client requirements

## Description

We're looking for a hands-on engineer who thrives in a collaborative XP environment and enjoys working across the full stack. You'll partner closely with the business, ship frequent releases, and have a real influence on product and technical direction.

How we build

 * XP practices: Test-Driven Development, pair programming, continuous refactoring, trunk-based development, and frequent production releases.

 * Human-in-the-loop AI: We use GitHub Copilot to improve quality while keeping humans in control. We iterate in small steps, uphold code quality, and share learnings

 * DevOps mindset: Teams own their CI/CD pipelines and collaborate closely with SRE partners to run resilient services in production.

Your key responsibilities

 * Design, build, and maintain robust, well-tested software; keep solutions simple and evolvable

 * Work directly with the Business to shape product goals and iterate quickly on value

 * Willingness to work full stack, Back End and Front End Development.

 * Own build and deployment: evolve CI/CD pipelines; support, monitor, and continuously improve production services

 * Guide architecture: make pragmatic architectural decisions, improve system design, and reduce complexity over time

 * Champion engineering excellence: pair, review, refactor, and share knowledge to raise the bar for the whole team

 * Use AI well: apply GitHub Copilot to speed up small, safe iterations; keep humans in the loop; share prompts, patterns, and learnings with the team