Senior Software Engineer Python

We'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 features
• Make pragmatic architecture and design decisions
• Own services end-to-end, including performance, reliability, and incident response
• Set standards for testing, observability, and security
• Mentor engineers and contribute to strong team practices
• Collaborate closely with Product, Design, and Data teams

• Strong experience as a Senior Software Engineer in modern product teams
• Proven ability to design and deliver scalable, reliable systems
• Experience operating production services
• Strong coding, code review, and technical leadership skills
• Comfortable working through ambiguity and influencing technical direction

• Salary up to £100,000
• Hybrid working - 2 days per week in the London office
• High ownership, high-impact role
• Strong engineering culture focused on quality and reliability