Full Stack Developer jobs in United Kingdom

As a Senior Software Developer, you’ll play a key role in shaping the architecture and delivery of our backend systems. You’ll work with modern technologies, influence technical decisions, and collaborate with talented engineers who care deeply about quality and impact.

Essential responsibilities include:

• Designing, developing, and maintaining reliable backend services using Go (Golang)
• Contributing to architecture discussions and technical decision-making
• Building robust event-driven and asynchronous workflows using tools such as RabbitMQ
• Working with microservices-based architectures
• Ensuring high code quality through clean, well-tested, and maintainable code
• Supporting and improving system reliability, performance, and scalability

You’re an experienced backend engineer with a passion for clean code and scalable systems, and you enjoy taking ownership and initiative.

Essential skills and experience:

• Strong commercial experience with Go (Golang)
• Solid understanding of event-driven architecture and microservices
• Hands-on experience with:
• Redis
• RabbitMQ
• PostgreSQL
• Familiarity with Docker and containerised application development
• A proven track record of writing clean, tested, and maintainable code

• Previous experience working with healthcare systems

CLEO Systems is a wholly owned subsidiary of Integrated Care 24 (IC24) — the UK’s leading not-for-profit social enterprise delivering innovative, patient-focused primary care services.

Through our mission of Clinical Excellence Online (CLEO), we support the wider IC24 ambition to:

• Improve access to health and social care
• Reduce demand on secondary care services

IC24 supports over 6 million patients, delivering GP out-of-hours services, NHS 111, primary and secondary care support across the UK.

• Hybrid working – remote with occasional travel to Ashford, Kent
• 37.5 hours per week

• Salary: £70,000 per annum (dependent on experience)
• Hybrid working flexibility
• Nest Company Pension Scheme
• Free 24/7 independent counselling service
• Reward and discount platform
• Benenden Health – company-paid health support, from private GP appointments to secondary care treatment
• Learning & Development opportunities to support career progression
• Community engagement – one paid day per year for volunteering 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: 19th February 2026

At CLEO Systems, we celebrate brave ideas and brave people.

www.cleosystems.com

This advert may close sooner if sufficient applications are received.

We are committed to equal opportunities and particularly encourage applications from ethnic minorities, applicants with disabilities, and those from other under-represented groups.

If you would like to discuss reasonable adjustments or request accessible recruitment documents, please contact our recruitment team at careers@cleosystems.com.