Harnham
Full Stack Engineer (AI Native)
Full Stack Engineer (AI Native) at Harnham, based in City of London, London. This is a permanent role with hybrid working.
- Pay
- Not given by the employer
- Hours and contract
- Permanent · Hybrid
- Location
- City of London, London
- Closing date
- Sector
- Software Developer
Reference https://www.harnham.com/job/e1aeb1da-8723-4ba1-d23d-08d5948a7341-full-stack-engi
About the role
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FULL STACK ENGINEER (AI-NATIVE)Up to £85,000 + Benefits
London (Hybrid, 2 Days per Week)
This is a great opportunity to join a high-growth fintech scale-up where you can take ownership of customer-facing products whilst working in an AI-first engineering environment. You’ll help build technology that combines financial data, analytics, and behavioural insights to deliver meaningful outcomes for end users.
THE COMPANY:
This rapidly growing WealthTech business is transforming how individuals engage with their financial lives through innovative technology, sophisticated analytics, and exceptional user experience. Backed by leading investors and operating in a scale-up environment, the business is building a platform that provides users with a complete view of their financial world alongside personalised insights and recommendations.
The engineering function operates through cross-functional Agile squads and is heavily focused on leveraging AI to increase engineering productivity and innovation.
THE ROLE:
You will take ownership of software within one of the engineering squads, contributing across both front-end and back-end development while working alongside product, engineering, and technical operations teams.
Key responsibilities include:
- Building and enhancing customer-facing web applications.
- Developing scalable features using React, JavaScript and TypeScript.
- Contributing to backend services built with Kotlin and Spring.
- Leveraging AI tools and agentic development workflows as part of your day-to-day engineering process.
- Working within Agile Scrum teams to plan, develop, test and release software.
- Collaborating on APIs, microservices and event-driven architectures.
- Driving software quality, performance, security and scalability.
YOUR SKILLS AND EXPERIENCE:
You will bring strong capability in:
- Java and Kotlin backend development on the Spring stack.
- React, JavaScript and TypeScript.
- AI-assisted development, particularly using Claude and agentic engineering workflows.
- CI/CD pipelines, automated testing and API integrations.
- AWS, Docker and/or Kubernetes.
- Jira, Agile methodologies and collaborative software delivery.
THE BENEFITS:
You will receive a salary of up to £85,000 depending on experience, along with a comprehensive benefits package.
Please note: Sponsorship is not available for this position.
HOW TO APPLY:
Please register your interest by sending your CV to Molly Bird via the apply link on this page.
To Apply for this Job Click Here
Reference: https://www.harnham.com/job/e1aeb1da-8723-4ba1-d23d-08d5948a7341-full-stack-engi · Posted 3 hours ago · Closes 27 Nov 2026 · Listed via Harnham
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