Lead Full-Stack Developer

Experis; Milton Keynes; On-site; GBP 100,000 - 125,000; Full time

Job summary

A leading technology company is seeking a Lead Full Stack Developer for a hybrid role based in Milton Keynes. You will play a crucial role in developing an AI-enabled service for government projects. Responsibilities include creating responsive UIs and server-side logic, as well as managing databases and CI/CD pipelines. Essential skills include expertise in Java and React, API design, and experience with PostgreSQL. This position offers a competitive rate and is outside IR35.

Qualifications

• Strong experience delivering complex full-stack applications.
• Commercial expertise in Java plus at least one other back-end language (ideally Python).
• Solid experience with React and modern front-end tooling.

Responsibilities

• Design and build modern, responsive user interfaces.
• Develop using React, TypeScript, JavaScript, HTML, CSS.
• Design and develop APIs and services.
• Build server-side logic using Java (Spring Boot).
• Implement CI/CD pipelines (e.g. GitHub Actions, Jenkins).

Skills

Full stack application delivery

Java

React

API design

Relational databases

Linux and Windows environments

CI/CD pipelines

Docker

Tools

PostgreSQL

Jenkins

GitHub Actions

Job description

Lead Full Stack Developer

Rate: Up to £650/day (Outside IR35)

Duration: 6 months initially

Location: Hybrid - Milton Keynes / Remote

Clearance: SC Cleared

Overview

An exciting opportunity for a Lead Full Stack Developer to join a small, high‑performing tech company supporting a major UK government programme. You'll play a key role in the development and evolution of a cutting‑edge, AI‑enabled digital service used across multiple government departments. This role combines hands‑on development with technical leadership, working closely with architects, product stakeholders, and client teams to deliver secure, scalable software solutions.

Responsibilities

• Front End
  • Design and build modern, responsive user interfaces
  • Develop using React, TypeScript, JavaScript, HTML, CSS
  • Drive strong UX and cross-browser compatibility
• Back End
  • Design and develop APIs and services
  • Build server‑side logic using Java (Spring Boot)
  • Contribute to overall application architecture
• Data & DevOps
  • Design and maintain relational databases (PostgreSQL preferred)
  • Implement CI/CD pipelines (e.g. GitHub Actions, Jenkins)
  • Deploy and operate services in cloud environments (AWS, Azure or GCP)
  • Use containerisation tools such as Docker
• Quality & Collaboration
  • Lead and participate in code reviews
  • Write unit, integration and end‑to‑end tests (JUnit, Testcontainers, Vitest, Storybook)
  • Maintain clear technical documentation
  • Work closely with product, architecture and delivery teams
  • Embed security best practices (auth, access control, secure data handling)

Essential Skills & Experience

• Strong experience delivering complex full‑stack applications
• Commercial expertise in Java plus at least one other back‑end language (ideally Python)
• Solid experience with React and modern front‑end tooling
• Strong API design and integration experience
• Good working knowledge of Linux and Windows environments
• Proven problem‑solver with strong analytical skills
• Experience with relational databases, ideally PostgreSQL
• Comfortable working in small, fast‑moving delivery teams
• Able to commute to Milton Keynes as required