Attio is on a mission to redefine CRM for the AI era. We're building the first AI-native CRM – designed for the most ambitious go‑to‑market teams. We recently announced a $52M Series B led by GV (Google Ventures), with support from Redpoint, Balderton, Point Nine and 01 A. Our team thrives on solving complex technical challenges, delighting our users, and setting a new standard for the industry.
About the Role
We’re looking for a Web Infrastructure Engineer who lives and breathes the systems, runtimes, and tooling that enable engineers at Attio to ship fast and confidently. You’ll own performance across the stack – from the Node.js runtime and TypeScript pipelines to client‑side rendering, bundling, and real‑user metrics – and help shape the web infrastructure that powers Attio’s product.
Location: UK, Europe & Africa – UK: Leeds
What You’ll Do
* Lead initiatives to improve performance in both the frontend (React, web workers, bundling) and backend (Node.js runtime, TypeScript pipelines, and I/O efficiency).
* Use profiling and benchmarking techniques to identify and eliminate bottlenecks and memory leaks in our Node.js services and client‑side application code.
* Build and integrate metrics, tracing, and performance dashboards to make performance data accessible and actionable across teams.
* Reduce build and CI/CD overhead by optimising dependency management, incremental builds, caching strategies, and monorepo workflows.
* Define internal best practices, guidelines, and tooling for the web infrastructure that scale with the company.
* Represent Attio’s Product & Engineering values both internally and externally.
What You’ll Bring
* Deep expertise in JavaScript and TypeScript performance on both client and server, including event‑loop behaviour, garbage collection, async I/O, and memory management.
* Proven experience designing and optimising internal API and service‑layer architecture – especially frameworks that coordinate data fetching, caching, and state management across large React/TypeScript codebases.
* Strong familiarity with performance tooling such as Chrome DevTools, Node profiler/inspector, flamegraphs, Lighthouse, APM platforms, and runtime exploration tools.
* Strong understanding of frontend performance patterns (lazy loading, route‑level splitting, bundle analysis, caching strategies, web workers).
* Experience using Real‑User Metrics (RUM) to guide and prioritize performance improvements, and comfort working with tools such as Datadog, Sentry, Prometheus, Grafana, or OpenTelemetry.
* Systems‑level understanding of build and CI/CD pipelines (Yarn, pnpm, npm, esbuild, Vite, Turborepo, Rsbuild, incremental builds).
* Excellent communication skills and the ability to influence engineers across product teams to align on performance strategy.
Nice to Have
* Experience with React internals, reconciliation debugging, or custom performance instrumentation.
* Contributions to open‑source infrastructure projects, performance tooling, or JavaScript/TypeScript runtimes.
* Familiarity with TypeScript compiler internals, V8 engine behaviour, or WebAssembly tooling.
* Familiarity with Go, Rust and native profilers such as dtrace, xctrace and Linux perf.
* Experience optimizing large‑scale real‑time or collaborative web applications.
What We Offer
* Competitive salary of £95,000 to £125,000.
* Equity in an early‑stage tech company on an incredible trajectory.
* 25 days holiday plus local public holidays.
* Apple hardware.
* Private medical insurance through AXA.
* Pension contribution through Hargreaves Lansdown.
* Enhanced family leave.
* Team off‑site trips to fun places (Barcelona, Lisbon, Malta, Split).
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