Senior Full Stack Engineer

Insight Global; Greater London; On-site; GBP 90,000 - 120,000; Part time

Job summary

Insight Global in Central London is seeking a Senior Full Stack Engineer to join the Operational Tooling team on a rolling contract with conversion potential. The role blends frontend and backend work to build, monitor, and govern financial indices across the ecosystem.

This position is roughly 60% frontend (React) and 40% backend (Java/Spring Boot) with AWS hosting and AI-assisted development tools to accelerate delivery while upholding security and quality.

Qualifications

• Must have full stack development experience.
• Experience building React front-ends.
• Enterprise Angular experience preferred.
• Strong Java/Spring Boot backend experience.
• Experience building/consuming REST APIs.
• Familiarity with GraphQL.
• Proficient with SQL/NoSQL databases.
• Experience deploying to AWS environments.

Responsibilities

• Develop modern front-end applications using React, while maintaining and improving Angular components.
• Build and maintain Java Spring Boot services and APIs to support workflows.
• Collaborate with product, UX, QA and platform teams to deliver scalable solutions.
• Create dashboards, grids, and reporting tools for complex datasets.
• Leverage AI-assisted tooling to accelerate delivery with governance and security.

Skills

Full stack development

React

Angular

Java

Spring Boot

REST APIs

GraphQL

SQL

NoSQL

AWS

Job description

Senior Full Stack Engineer | Central London, 3 Days a Week Onsite | Rolling Contract with Conversion Possibility

Overview

A leading financial data and analytics organisation is seeking a Senior Full Stack Developer to join the Operational Tooling team, responsible for building and enhancing the strategic platform used to create, manage, monitor, and govern financial indices across the ecosystem.

This role is heavily focused on delivering modern, data-driven user interfaces and scalable backend services that support operational workflows, approvals, auditing, exception management, dashboarding, and integrations across multiple services. The position is approximately 60% front-end and 40% back-end, making it ideal for an engineer who enjoys building intuitive user experiences whilst remaining hands-on with Java backend development.

React is the strategic front-end technology moving forward, whilst Angular remains an important part of the existing ecosystem and will continue to be supported and modernised. On the backend, you will build and maintain Java Spring Boot services, APIs, integrations, and cloud-hosted applications within AWS.

This is also an AI-first engineering environment, where developers are encouraged to leverage AI tools responsibly to accelerate delivery whilst maintaining strong engineering judgement, accountability, security, and quality standards.

Day-to-Day Responsibilities

As a Senior Full Stack Developer, you will work on the next generation of Index Management Platform, building workflow-driven applications that enable users to create, maintain, monitor, and govern financial indices. Much of your time will be spent developing modern front-end applications using React whilst also supporting and enhancing existing Angular applications as the platform continues its transition towards React.

On the backend, you will build Java Spring Boot services, APIs, and integrations that support workflow management, approvals, auditing, notifications, and operational processes. You will work closely with Product Owners, Business Analysts, UX Designers, QA Engineers, Architects, and Platform teams to deliver scalable solutions from concept through to production.

The platform contains significant amounts of complex data, requiring developers who are comfortable visualising, managing, and interacting with large datasets through dashboards, grids, workflows, and reporting tools. You will build integrations using REST and GraphQL APIs, contribute to dashboard functionality, and support applications running within AWS environments. The role also involves leveraging AI-assisted development tools to support prototyping, development, testing, and documentation activities.

Must Haves

• Full Stack Software Development experience
• Experience developing applications with React
• Enterprise level experience maintaining or developing applications in Angular
• Enterprise level experience backend development experience with Java and Spring Boot
• Experience building and consuming REST APIs
• Understanding of GraphQL
• Strong experience working with SQL and/or NoSQL
• Experience developing and supporting cloud-hosted applications within AWS