Full Stack Engineer

Harnham; Greater London; Hybrid; GBP 51,000 - 85,000; Full time

Benefits offered by this job

Pension contribution

25 days holiday

Regular team socials

Clear progression opportunities

Job summary

Harnham is hiring a Full Stack Engineer (React/TypeScript/Java) in London with hybrid working. The role involves 65% frontend and 35% backend, delivering features for a WealthTech platform and shaping technical decisions in a modern cloud-native environment.

You will work in a cross-functional squad, focusing on frontend while contributing to backend services and APIs, with AI-assisted development tools integrated into daily workflows.

Qualifications

• Strong commercial experience with React and TypeScript.
• Backend development experience with Java and Spring/Spring Boot.
• Experience in developing and consuming APIs and understanding clean code practices.
• Familiarity with Agile methodologies and AI-assisted development tools.

Responsibilities

• Deliver new features and improve platform performance in a cross-functional squad.
• Contribute to frontend and backend services and APIs in a cloud-native environment.
• Incorporate AI tools into the daily coding and testing workflow.
• Support best practices, testing, and continuous delivery within an Agile setup.

Skills

React

TypeScript

Java

Spring / Spring Boot

APIs

AI-assisted development

Agile

APIs development

Tools

AWS

Docker

Kubernetes

Kafka

GraphQL

Job description

Full Stack Engineer (React / TypeScript / Java)

Up to £85,000 + Benefits

Hybrid Working | London | 2 Days per Week in Office

We're working with a fast-growing WealthTech business that is transforming the way individuals and families engage with their finances through innovative technology and exceptional user experiences.

They're looking for a Full Stack Engineer to join a highly collaborative engineering team building and enhancing a modern web platform. This role is approximately 65% Frontend and 35% Backend, making it ideal for engineers who enjoy creating outstanding user experiences while remaining hands-on across the full stack.

The Role

You’ll join a cross-functional squad responsible for delivering new features, improving platform performance, and helping shape technical decisions across the product.

The role has a strong frontend focus, but you’ll also contribute to backend services and APIs, working within a modern cloud-native environment.

A key aspect of the engineering culture is the use of AI-assisted development tools, so candidates must already be comfortable incorporating AI into their daily workflow for coding, testing, and productivity.

• Strong commercial experience with React
• Strong commercial experience with TypeScript
• Commercial backend development experience with Java
• Experience working with Spring / Spring Boot
• Hands-on experience using AI-assisted development tools as part of the software development lifecycle
• Experience developing and consuming APIs
• Understanding of software engineering best practices, testing, and clean code principles
• Experience working within Agile environments

Nice to Have

• AWS experience
• Docker and Kubernetes
• Event-driven systems (Kafka or similar)
• GraphQL

What You'll Get

• Salary up to £85,000
• Hybrid working (2 days per week in London)
• Pension contribution
• 25 days holiday
• Regular team socials
• Clear progression opportunities within a growing engineering organisation