Senior Software Engineer

Onyx-Conseil; Greater London; On-site; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Private healthcare

Pension scheme

Share scheme

Job summary

CGI in the United Kingdom is seeking a Senior Software Engineer to own and improve critical digital services, collaborate with engineering, QA and client teams, and deliver resilient, high‑performance solutions. The role blends hands‑on development with service improvement in a hybrid working arrangement and may require UK security clearance.

We offer a competitive salary, pension, private healthcare and a share scheme; CGI values diversity and professional growth.

Qualifications

• Experience delivering secure, scalable software services.
• Ability to collaborate with cross-functional teams and stakeholders.

Responsibilities

• Take ownership of complex technical challenges and drive improvements in reliability, resilience and performance.
• Collaborate with engineering, platform, QA and client teams to deliver secure digital solutions.

Job description

Join CGI as a Senior Software Engineer and help shape, strengthen and evolve critical digital services that clients rely on every day. You’ll have the opportunity to take ownership of complex technical challenges, turn insight into lasting improvements and deliver enhancements that increase reliability, resilience and performance. Working alongside experienced engineering, platform, QA and client teams, you’ll have the freedom to bring forward new ideas while being supported by a collaborative community of experts. This is an opportunity to combine hands‑on engineering with meaningful service improvement, helping CGI deliver secure, high‑value digital solutions while developing your expertise across modern applications and cloud technologies.

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 the programme, you will need to hold UK Security Clearance or be eligible to go through this clearance. This is a hybrid position.