Cloud Network Engineer focusing on Azure network architecture and Zscaler solutions at Packsize. Collaborating with IT and DevOps to enhance network security and performance.
About the role
- Web Infrastructure Engineer optimizing Node.js runtime and frontend architecture for Attio's AI-native CRM. Leading performance initiatives while collaborating with engineering teams.
Responsibilities
- 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
Requirements
- 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
Benefits
- 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)
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