- 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, 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.

Must-Have Skills :

- 3+ years of professional JavaScript/TypeScript development experience.

- Strong expertise in browser APIs and event-driven programming.

- Hands-on experience with performance measurement and optimization 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, WebSockets.

- Familiarity with Open Telemetry for frontend instrumentation.

- Understanding of privacy and compliance in telemetry (PII masking, GDPR considerations).

- Experience with session replay libraries and customization.

- Prior contributions to observability, analytics, or APM solutions.