Full Stack Engineer (AI Native)

Harnham - Data and Analytics Recruitment; Greater London; Hybrid; GBP 51,000 - 85,000; Full time

Benefits offered by this job

Benefits package

Job summary

Harnham - Data and Analytics Recruitment in London is seeking a Full Stack Engineer (AI-Native) to own customer-facing software within an AI-first fintech environment, delivering scalable features and robust interfaces.

You will work across front-end and back-end with React, Kotlin, Spring and AI tooling, in Agile squads, shipping reliable code in collaboration with product, engineering and operations teams.

Qualifications

• Experience with frontend and backend development using modern JS/TS frameworks.
• Strong back-end skills in Java/Kotlin and Spring stack.
• Experience with AI-assisted development and responsible tooling.
• Familiarity with CI/CD, testing, and API integrations.
• Knowledge of AWS, Docker and/or Kubernetes; Agile delivery.

Responsibilities

• Build and enhance customer-facing web applications.
• Develop scalable features using React, TypeScript and Kotlin.
• Contribute to backend services and APIs in a Spring stack.
• Apply AI tools and agentic workflows in daily engineering work.
• Work in Scrum teams to plan, test and release software.

Skills

React

Java

Kotlin

TypeScript

AI-assisted development

CI/CD

Agile

Tools

Spring

Jira

AWS

Docker

Kubernetes

Job description

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.