Java Developers (all levels)

Onyx-Conseil; Greater London; On-site; GBP 60,000 - 90,000; Full time

Benefits offered by this job

Pension plan

Private healthcare

Share scheme

Job summary

CGI is seeking a Java Developer to design and build scalable, secure back-end services for UK Government programmes. You’ll work in a hybrid setup, collaborating with skilled professionals who own their work and pursue continuous learning. A UK Security Clearance or eligibility is required to participate in sensitive projects.

Join an open, supportive community that values innovation and impact, with a competitive package including pension, private healthcare and a share scheme.

Qualifications

• Proficient in Java and back-end architectures.
• Experience delivering microservices with resilience and scalability.
• Knowledge of secure coding practices and testing.

Responsibilities

• Design and develop scalable Java back-end services.
• Collaborate with cross-functional teams to deliver platform components.
• Ensure security, reliability and performance across systems.

Skills

Java

Microservices

Back-end development

Tools

Spring Boot

JUnit

Job description

At CGI, we’re shaping the future of digital UK Government solutions, building secure, high-impact platforms that improve services for millions across the UK. As a Java Developer, you’ll play a pivotal role in designing and developing scalable, resilient back-end systems using the latest Java and microservices technologies. You’ll collaborate with skilled professionals who take ownership of their work, share ideas freely, and are empowered to create solutions that make a lasting difference. This is an opportunity to contribute to a variety of major national UK Government programmes where innovation, teamwork, and continuous learning come together to deliver meaningful results for our clients and improve the lives of UK citizens.

CGI was recognised in the Sunday Times Best Places to Work List 2025 and has been named a UK ‘Best Employer’ by the Financial Times. We offer a competitive salary, excellent pension, private healthcare, plus a share scheme (3.5% + 3.5% matching) which makes you a CGI Partner not just an employee. We are committed to inclusivity, building a genuinely diverse community of tech talent and inspiring everyone to pursue careers in our sector, including our Armed Forces, and are proud to hold a Gold Award in recognition of our support of the Armed Forces Corporate Covenant. Join us and you’ll be part of an open, friendly community of experts. We’ll train and support you in taking your career wherever you want it to go.

Due to the secure nature of our work programmes, you will need to hold UK Security Clearance or be eligible to go through this clearance. These roles will be predominately hybrid with some work based in UK CGI or client offices depending on the specific programme. Travel away from base office will be expensed.