Lead Full-Stack Developer

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)

• 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

Our role is to help our employees develop their careers through planning, coaching and training. We recognise everyone's contribution to our success and reward achievement at every level. Along with generous commission and bonus schemes, we offer a variety of on-the-spot rewards - from bottles of fizz, team nights out, and extra days off; to thrill-seeking experience days, social events and money off vouchers.

Experis delivers talent with the powerful combination of the technical skills you're after multiplied by the soft skills that are harder than ever to find. Offering IT resourcing, project solutions and managed services, we enable organisations to cultivate individuals and teams prepared for the digital age. Experis is part of the ManpowerGroup family of brands. ManpowerGroup is the world leader in innovative workforce solutions, connecting human potential to the power of business, We're Experis - the professional resourcing arm of ManpowerGroup and the largest IT recruiter in Europe; placing more than 44,000 experts into IT every day. We're a different kind of talent company with a reputation as the global leader in professional talent and workforce solutions. That's why over 80% of the Fortune Global 500 turns to us for the professional talent that will set their business apart., Unlocking talent is what we do. Through a structured career ladder which incorporates extensive training, coaching and mentoring opportunities, we'll empower you with the tools you need to achieve your personal best. We'll work with you to build a development path that's aligned to your aspirations - whether you're at the very start of your career or a seasoned professional. We offer one-day training courses, digital learning, leadership programmes and many other development initiatives.