Lead Full-Stack Developer

Experis; England; Hybrid; GBP 100,000 - 125,000; Full time

Job summary

A tech consulting firm is looking for a Lead Full Stack Developer to support a major UK government programme. You will be responsible for designing modern user interfaces and developing secure, scalable software solutions. The ideal candidate will have extensive experience with Java and at least one other back-end language, along with expertise in React. This is a hybrid role based in Milton Keynes that requires SC clearance. Competitive day rate of up to £650 is offered.

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.
• Strong API design and integration experience.

Responsibilities

• Design and build modern, responsive user interfaces.
• Develop using React, TypeScript, JavaScript, HTML, CSS.
• Design and develop APIs and services.
• Deploy and operate services in cloud environments (AWS, Azure or GCP).
• Lead and participate in code reviews.

Skills

React

Java

JavaScript

TypeScript

APIs

PostgreSQL

Docker

CI/CD

HTML

CSS

Tools

Spring Boot

GitHub Actions

Jenkins

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