Senior Software Engineer (Python)

Harnham; Greater London; Hybrid; GBP 90,000 - 110,000; Full time

Benefits offered by this job

Salary up to £100,000

Hybrid working – 2 days per week in the London office

Strong engineering culture focused on quality and reliability

Job summary

A technology company in Greater London is looking for a Senior Software Engineer to build and scale a high-impact ad-fraud prevention platform. This senior individual contributor role emphasizes ownership and quality in engineering. Candidates should have extensive experience in modern product teams, proven skills in designing scalable systems, and technical leadership abilities. The position offers a salary up to £100,000 and a hybrid working arrangement with two days in the London office.

Qualifications

• Strong experience as a Senior Software Engineer in modern product teams.
• Proven ability to design and deliver scalable, reliable systems.
• Experience operating production services.

Responsibilities

• 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.

Skills

Strong coding skills

Code review

Technical leadership

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