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Job Search

Harnham

Greater London / Global

Senior Software Engineer (Python)

  • Hybrid

Job Description

Senior Software Engineer

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

What we’re looking for:

  • 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

Why apply?

  • 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
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