Software EngineeringEngineeringPlatinum

Monitor and improve the performance of your web application's frontend.

Frontend Observability Engineer

Core Web Vitals, RUM, Sentry

1 activationsadvancedv5.0

Best for

▸Debugging Core Web Vitals failures with session replay analysis to identify specific user interactions causing poor LCP, INP, or CLS scores
▸Implementing error budget tracking for frontend releases with automated rollback when error rates exceed SLO thresholds
▸Setting up RUM monitoring pipeline to capture field performance data across different user segments and geographic regions
▸Configuring synthetic monitoring with Playwright to catch performance regressions before they reach production users

What you'll get

▸Detailed monitoring configuration with specific Core Web Vitals thresholds (LCP <2.5s for 75th percentile), error budget calculations (99.5% availability = 21.6 minutes downtime/month), and attribution setup for debugging poor scores
▸Step-by-step session replay analysis workflow identifying rage clicks, dead clicks, and performance bottlenecks with specific code-level recommendations for optimization
▸Comprehensive dashboard design mockup showing performance distribution across user segments, error trend analysis, and automated alerting rules tied to business impact metrics

Expects

Web application URLs, existing monitoring tool access, performance requirements (SLOs), and current tech stack details including frontend frameworks and deployment pipeline.

Returns

Actionable performance monitoring setup with specific metric thresholds, alerting configurations, dashboard designs, and debugging playbooks for common performance issues.

What's inside

“You are a Frontend Observability Engineer. You combine real user monitoring (RUM), synthetic testing, session replay, error tracking, and performance metrics to give engineering teams actionable visibility into how their frontend performs for real users. - **Translate raw telemetry into business imp...”

Covers

What You Do DifferentlyMethodologyWatch For

Not designed for ↓

×Backend API monitoring or database performance optimization
×Mobile app performance monitoring (native iOS/Android applications)
×Network infrastructure monitoring or CDN configuration
×Server-side error tracking or application security monitoring

SupaScore

89.53▼

Research Quality (15%)

8.85

Prompt Engineering (25%)

9.2

Practical Utility (15%)

8.65

Completeness (10%)

9.55

User Satisfaction (20%)

8.8

Decision Usefulness (15%)

8.75

Evidence Policy

Standard: no explicit evidence policy.

observabilitycore-web-vitalsrumsession-replayerror-budgetsperformancemonitoringsentry

Research Foundation: 6 sources (4 official docs, 1 books, 1 web)

This skill was developed through independent research and synthesis. SupaSkills is not affiliated with or endorsed by any cited author or organisation.

Version History

v5.03/25/2026

v5.5 distilled from v2 via Claude Sonnet

v2.02/22/2026

Pipeline v4: rebuilt with 3 helper skills

v1.0.02/15/2026

Initial version

Works well with

Commerce Vitals Tuning ExpertPlatinum Core Web Vitals OptimizerPlatinum Monitoring & Observability DesignerPlatinum Session Replay Diagnostics ExpertPlatinum SRE Incident Response ExpertPlatinum

Need more depth?

Specialist skills that go deeper in areas this skill touches.

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Common Workflows

Performance-Driven Release Pipeline

Monitor performance baselines, optimize Core Web Vitals, then implement performance-gated deployments with automated rollback on regression

frontend-observability-engineer→Core Web Vitals Optimizer→canary-release-governance