Infrastructure Engineer

Currie & Brown; Selby; On-site; GBP 95,000 - 125,000; Full time

Job summary

An innovative tech company based in the UK seeks a Web Infrastructure Engineer to enhance performance across their platform. You will lead initiatives on frontend and backend systems, utilizing expertise in JavaScript and TypeScript. Responsibilities include improving performance metrics and defining internal best practices that scale with the company. Offering a competitive salary, equity, comprehensive benefits, and opportunities for team off-site trips, this position is perfect for performance-driven engineers.

Benefits

Competitive salary

Equity in the company

25 days holiday

Private medical insurance

Pension contribution

Enhanced family leave

Team off-site trips

Qualifications

• Deep expertise in JavaScript and TypeScript performance on client and server.
• Proven experience in designing internal API and service-layer architecture.
• Strong familiarity with performance tooling like Lighthouse and APM platforms.

Responsibilities

• Lead initiatives to improve frontend and backend performance.
• Use profiling to identify bottlenecks and memory leaks.
• Build metrics and performance dashboards for team accessibility.

Skills

JavaScript performance

TypeScript performance

Node.js performance

Frontend performance patterns

API design

Communication skills

Tools

Chrome DevTools

Node profiler

Datadog

Sentry

Job description

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).