Web Infrastructure Engineer

Attio Ltd; Greater London; Hybrid; GBP 95,000 - 125,000; Full time

Job summary

A cutting-edge technology company in London seeks a Web Infrastructure Engineer to enhance their AI-native CRM. You will lead efforts to optimize performance both frontend and backend, using tools like Node.js and TypeScript. The ideal candidate will have a strong background in service-layer architecture, performance tooling, and excellent communication skills. The role offers a competitive salary between £95,000 and £125,000, equity options, private medical insurance, and enhanced family leave.

Benefits

Competitive salary

Equity in startup

Private medical insurance

Pension contribution

Enhanced family leave

Team off-site events

Qualifications

• Proven experience designing and optimising internal API and service-layer architecture.
• Strong familiarity with performance tooling.
• Excellent communication skills to influence product teams.

Responsibilities

• Lead initiatives to improve performance in frontend and backend.
• Identify and eliminate bottlenecks in Node.js services.
• Build metrics and performance dashboards.

Skills

API and service-layer architecture design

Performance tooling

Frontend performance patterns

Real-User Metrics (RUM)

Communication skills

Tools

Chrome DevTools

Node profiler

Datadog

Sentry

Grafana

Job description

Help shape the web infrastructure that powers Attio’s product

Location

London, United Kingdom [Hybrid]

Engagement Type

Full-time

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

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

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

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)