Platform Engineer

Location: London

Salary: £140K - £175K

About the company Our client is an engineering-driven crypto technology company based in London, building and operating leading high-performance Ethereum infrastructure and expanding it to other chains. They are venture backed and have been profitable for several years. The role This role exists to increase the operating leverage of the engineering team.

You’ll own the production platform, developer experience, observability, deployment workflows, internal tooling and the feedback loops that let engineers ship quickly. Here, infrastructure directly affects market share and P&L. Strong production and platform engineers can have an outsized impact because the platform is still early: there’s room to set direction, establish the right operating model, choose the right abstractions and automations, and turn scattered workflows into reliable systems the whole team builds on.

What you’ll work on Production systems and reliability Own the infrastructure and operational workflows that keep production systems predictable. That means making deployments safe and repeatable, keeping rollback paths clear, improving host and service health, and making sure incidents are easy to understand when they happen.

Observability and alerting Build the feedback loops engineers rely on to understand production. Metrics, logs, dashboards, traces and alerts should make the state of the system obvious, especially when something is wrong. Cutting false alerts is a big part of this, and it depends on understanding the system well enough to know what should and shouldn’t trigger an alert.

Developer experience Given the pace of work and the size of the team, a lot of operational work can become manual unless someone owns it properly. You’ll improve the path from local development to production: faster CI, more reliable builds, better test environments, cleaner deployment tooling, simpler configuration and secrets workflows, and internal tools that remove repetitive manual work.

Small improvements here compound across the whole engineering team. Infrastructure performance The systems are latency-sensitive, and infrastructure details matter. You’ll work close to the boundary between application code and the machines it runs on: host-level tuning, networking behaviour, kernel settings, CPU isolation, resource contention, noisy neighbours and the practical details of running high-performance services in production.

AI and internal tooling The team wants to use AI where it genuinely increases engineering leverage. As the team moves quickly, useful context can become fragmented across scripts, docs, dashboards, incident notes, one-off fixes and individual workflows. You’ll help turn that into shared tooling that runs safely. Security Help maintain the security and integrity of systems from production infrastructure to developer workstations, including access controls, secrets management, endpoint and infrastructure hardening, vulnerability management and security monitoring, with a focus on making secure practices part of everyday engineering.

What they’re looking for High agency: A lot of the work will start as something vague. You’re comfortable finding problems yourself, deciding what matters and taking them from observation through to a real fix. High drive: There’s a lot to improve, and platform engineers can be huge levers on team output. You move quickly, raise the standard around you and keep important work moving without needing a queue of tickets.

Strong infrastructure fundamentals: Experience deploying, managing and automating cloud infrastructure. Infrastructure automation and CI/CD: Comfortable building processes with simple tooling or automation. Good judgement around observability and operations: Alerts should be specific, actionable and reserved for things that matter.

Monitoring should reflect how the system behaves today, not six months ago. If an alert becomes noisy, you notice and fix it before the rest of the team does.