Senior Engineer

Up to £100,000 per annum D.O.E

Full‑time: Hybrid | London

As a Senior Engineer (IC3) at Lunio, you lead the design and delivery of complex, cross‑service features on our ad‑fraud prevention platform. You set a high bar for engineering quality by example. You make pragmatic architectural choices and help others navigate ambiguity. You operate the services you build, improve reliability and performance, and mentor teammates so the squad ships value predictably. You implement and deliver working solutions on an ongoing basis.

Key Responsibilities

• Lead complex delivery – shape scope and architecture for cross‑service features, break down ambiguity, coordinate across Product, Design and Data.
• Raise the quality bar – define practical standards for testing, security and observability; act as approver on critical PRs and model excellent reviews and pairing.
• Operate and improve production – own service performance targets, lead incident response, drive corrective actions to completion and reduce recurrence.
• Grow others – mentor and unblock teammates, transfer knowledge through pairing, docs and structured feedback.
• Shape team practices & roadmap – contribute to technical strategy and sequencing, surface trade‑offs and risks early, champion incremental delivery.
• Service ownership – own the full software development lifecycle for your changes and for all changes that affect a Service you have worked on, by monitoring PRs and success metrics for that service.

What makes a great Senior Engineer at Lunio?

• Software Design & Architecture: Designs evolvable systems with clear boundaries and data ownership, anticipates failure modes and keeps solutions simple.
• Technical Execution & Delivery: Leads execution across multiple stories/engineers, breaks down ambiguous problems, delivers predictably with sensible trade‑offs.
• Testing, Reliability & Observability: Bakes in testability, defines/uses service performance targets, alerts, logs and traces, advocates for reliability alongside features.
• Security & Privacy: Applies secure‑by‑default patterns, reviews dependencies/risks and addresses vulnerabilities within the team’s domain.
• Collaboration & Communication: Facilitates decisions, aligns stakeholders and records them via concise docs others can follow.

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