Senior Software Engineer (Python)Hybrid London (2 days/week)Up to £100,000 + BenefitsWe''re hiring a Senior Software Engineer to play a key role in building and scaling a high-impact ad-fraud prevention platform used globally. This is a senior IC role for engineers who enjoy ownership, solving complex problems, and setting a high bar for engineering quality.What you''ll do:Lead delivery of complex, cross-service featuresMake pragmatic architecture and design decisionsOwn services end-to-end, including performance, reliability, and incident responseSet standards for testing, observability, and securityMentor engineers and contribute to strong team practicesCollaborate closely with Product, Design, and Data teamsWhat we''re looking for:Strong experience as a Senior Software Engineer in modern product teamsProven ability to design and deliver scalable, reliable systemsExperience operating production servicesStrong coding, code review, and technical leadership skillsComfortable working through ambiguity and influencing technical directionWhy apply?Salary up to £100,000Hybrid working - 2 days per week in the London officeHigh ownership, high-impact roleStrong engineering culture focused on quality and reliability