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 our $52M Series B, led by GV (Google Ventures), with support from Redpoint, Balderton, Point Nine, and 01A. Our team thrives on solving complex technical challenges, delighting our users, and setting a new standard for the industry.
About The Role
Our engineering team tackles the toughest challenges so our users never have to. Real-time infrastructure, AI-native architecture, and a frontend that feels effortless — all powered by a team that moves fast, thinks rigorously, and holds an exceptionally high bar for quality.
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.
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 — particularly 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 prioritise 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 in fun places! (We've been to Barcelona, Lisbon, Malta, and Split so far)