Modern tech-stack. Hybrid infrastructure. Reliability for 4,000+ users. Lead Site Reliability Engineer £64,000 - £74,000 (+ Benefits) Grade: P3MP Reports to: Senior Manager, Platform Engineering Contract: Permanent Hours: Full time 35 hours per week Location: Stratford, London. Office-based with high flexibility (1-2 days per week in the office) Visa sponsorship: Cancer Research UK can consider visa sponsorship for this vacancy. If this applies to you, please ensure that this is clearly marked on your application. Closing date: 16 February :55. This vacancy may close earlier if a high volume of applications is received or once a suitable candidate is found, therefore we strongly recommend that you apply early to avoid disappointment. If you require more time to apply as part of a reasonable adjustment, please contact as soon as possible. Recruitment process: Telephone interview followed by two competency-based interviews Interview date: From the week commencing 23 February 2026 How do I apply? We operate an anonymised shortlisting process in our commitment to equality, diversity, and inclusion. CVs are required for all applications; but we won''t be able to view them until we invite you for an interview. Instead, we ask you to fully complete the work history section of the online application form for us to be able to assess you quickly, fairly, and objectively. At Cancer Research UK, we exist to beat cancer. We are professionals with purpose, beating cancer every day. But w