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.
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
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
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
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)
