Senior Java/React Full Stack Developer

Contract

Location: London (Hybrid – 1 day per month onsite)

Day Rate: Up to £600 per day, Outside IR35

Duration: 6 months with view to extend

Industry: Consultancy

SC Eligibility Required

About the Client

Our client is a specialist cloud and software engineering consultancy that helps organisations modernise how they build, deploy and operate software. Working across both public and private sectors, they partner closely with engineering teams to reduce technical debt, improve developer experience, and deliver resilient, scalable systems using modern engineering practices.

With a strong focus on cloud platforms, modern application delivery and long-term system evolution, this is an organisation known for its high engineering standards, collaborative culture, and meaningful work on complex, business-critical systems.

How you’ll spend your day

As a Senior Java / React Full Stack Developer contractor, you’ll work as a hands-on engineering consultant within a solutions engineering environment, supporting the modernisation of large, complex software systems.

You’ll collaborate closely with client engineering teams, platform engineers and testers to reduce technical debt, improve delivery speed, and introduce modern engineering practices. Reporting into a Principal Software Engineer, you’ll play a key role in influencing how software is designed, built and evolved.

Your day-to-day will include:

• Designing and delivering modern Java / React applications within complex, enterprise-scale systems
• Supporting the breakdown of monolithic architectures into well-defined microservices
• Applying Domain Driven Design (DDD) principles to improve system clarity and maintainability
• Improving development workflows, testing strategies and overall developer productivity
• Collaborating with platform and test engineers to deliver end-to-end solutions
• Supporting teams in adopting modern tooling and AI-assisted development approaches
• Acting as a senior consultant on delivery teams, guiding technical decisions and best practice

What you’ll bring to this role

This role suits an experienced, hands-on full stack engineer who enjoys working on complex systems and influencing delivery through both technical expertise and consultancy skills.

You’ll bring:

• Strong experience with React and modern front-end development
• Strong backend development experience using Java / Spring (MongoDB experience beneficial)
• A solid grounding in Domain Driven Design (DDD)
• Experience delivering microservice-based architectures
• Full-stack awareness and the ability to collaborate across engineering disciplines
• Confidence working directly with clients and influencing technical direction
• An interest in, or experience with, AI-assisted development to improve code quality and delivery speed

Core technologies include:

Java / Spring, React, HTML / CSS / XML, MongoDB, Playwright, Docker, Kubernetes, Maven, GitLab

(Nice to have: GovUK UI Framework)

What happens next?

One of our Recruitment Consultants will be in touch and inform you if you’ve been successful to the next stage of the process or not, which is a qualification call where we will tell you more about the role and the client, and understand more about you, your experience and career aspirations.

Should we both wish to proceed, we will submit your details to the client and be in touch regarding the outcome and any further steps.

The interview process for this client consists of:

• Stage 1 – Remote conversation with the client's internal talent team to learn more about the culture of the organisation.
• Stage 2 – Remote Panel Interview delving in to experience and technical discussion.

Equal Opportunities

We are committed to providing equal opportunities for all candidates and welcome applications from individuals regardless of age, disability, gender identity, marital status, race, religion or belief, sexual orientation, or any other characteristic protected by law. As an employment agency for permanent and contract hires, we are dedicated to promoting a diverse and inclusive workforce, and we encourage applications from underrepresented groups to drive innovation and equality within the workplace.

Should you require any reasonable adjustments please let us know so we can accommodate for any interactions with us at Biometric Talent, but also inform the client to ensure reasonable adjustments are made to allow for a fair and equitable process.