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Description supplied by the original job listing.
Responsibilities:
Design and develop JavaScript-based monitoring agents that capture performance metrics, errors, and user interactions in the browser.
Work with browser performance APIs (Navigation Timing, Paint Timing, Long Tasks, and Performance Observer) to track key metrics.
Implement support for Core Web Vitals (LCP, FID, CLS, INP) and other industry-standard KPIs.
Ensure that monitoring agents are lightweight, efficient, and non-intrusive.
Collaborate with backend/APM teams to correlate frontend traces with backend monitoring data.
Keep up with latest web performance standards and W3C specifications.
Requirements:
3+ years of professional JavaScript/TypeScript development experience.
Strong expertise in browser APIs and event-driven programming.
Hands-on experience with performance measurement and optimisation in web apps.
Solid understanding of Core Web Vitals and web performance monitoring.
Familiarity with cross-browser compatibility and web debugging tools.
Experience with one or more frontend frameworks (React, Angular, Vue).
Knowledge of compression techniques (gzip, brotli).
Exposure to RUM or frontend monitoring tools (New Relic, Datadog RUM, Dynatrace, Sentry, etc. ).
Nice-to-Have Skills:
Experience building or contributing to JavaScript SDKs/agents.
Knowledge of Web Workers, Service Workers, and WebSockets.
Familiarity with OpenTelemetry for frontend instrumentation.
Understanding of privacy and compliance in telemetry (PII masking, GDPR considerations).
Experience with session replay libraries and customisation.
Prior contributions to observability, analytics, or APM solutions.
Experience
3-7 yrs
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