Full Stack Developer jobs in United Kingdom

Senior Backend Developer- Node.JS

Express new ideas, take initiative and save lives. Others talk about being brave, at CLEO Systems, we’re made that way.

By providing highly capable, innovative, and integrated software solutions within integrated urgent care – every role at CLEO Systems is made to be brave.

As a Senior Software Developer at Cleo Systems, you will play a key role in designing, building, and maintaining robust, high-performance backend services that power our healthcare applications. You’ll work with modern technologies including Node.js, Redis, RabbitMQ, Postgres, and Docker to deliver scalable and secure software that directly supports clinicians and patients.

You will take ownership of critical technical components, contribute to architecture decisions, and collaborate with cross-functional teams including DevOps, Product and QA to ensure high-quality delivery. Your experience in event-driven systems, microservices, and containerised environments will help shape our evolving platform.

The ideal candidate for this role would be an experienced engineer who enjoys solving complex problems, writing clean and efficient code, and mentoring others to uphold best practices in software engineering.

You will have experience with –

• Backend Development: Design, develop, and maintain backend services using Node.JS
• Messaging & Asynchronous Workflows: Build and manage reliable messaging patterns using queues such as RabbitMQ and Pub/Sub patterns.
• Database Design: Develop efficient and scalable queries and schemas using PostgreSQL.
• API Design: Develop clean, RESTful APIs and contribute to internal and external API documentation.
• Containerisation: Aid in building services in containerised environments using Docker.
• Code Quality: Write testable, maintainable code and contribute to peer reviews, testing, and CI/CD pipelines.

Who are we?

CLEO Systems is a wholly owned subsidiary of Integrated Care 24 (IC24), the leading not-for-profit Social Enterprise providing innovative, and patient focused primary care services. We are committed to delivering ‘Clinical Excellence Online’ (CLEO). Through this mission we contribute to the wider Group ambition to improve access to health and social care for patients and reduce the demand on secondary care services. IC24 provides services to over 6 million patients, including GP led out-of-hours services, NHS 111, primary care and secondary care support services.

Location Hybrid (occasional travel to Ashford Kent)

Hours 37.5 per week

What’s in It for You?

• Salary: £70,000 per annum, depending on experience
• Location: Hybrid – Remote & occasional travel to our office in Ashford, Kent
• Benefits: Access to the Nest Company Pension Scheme, free 24/7 independent counselling service, and a reward and discount platform.
• Benenden Health: company paid health support from private GP appointments to secondary care treatment.
• Learning and Development: Opportunities to advance your career through training and development.
• Community Engagement: We support volunteering and provide one paid day annually for community or charitable activities.

Due to the nature of this position, employment is subject to proof of eligibility to work in the UK, completion of a satisfactory basic DBS disclosure and two references.

Closing date: 27th August 2025

At CLEO Systems we celebrate brave ideas and brave people.

www.cleosystems.com

We are committed to providing equal opportunities for all people and we particularly encourage applications from ethnic minorities, applicants with a disability and those from other under-represented groups.

If you would like to discuss any reasonable adjustments before applying or would like an accessible version of any recruitment documents, please contact the recruitment team on careers@ic24.nhs.uk.