We are looking for a Senior Web Performance Engineer to lead performance optimization for large-scale, web-based applications. This role focuses on end-to-end performance testing and tuning across front-end, middleware, and backend services. You will design and execute performance strategies to ensure fast, scalable, and reliable web experiences.

Responsibilities

* Define and implement performance testing strategies for web applications and APIs
* Develop and maintain performance test scripts using Java or Python for web workloads
* Conduct load, stress, and scalability testing for browser-based and API-driven traffic
* Analyze front-end performance metrics (Core Web Vitals, Lighthouse scores) and optimize rendering, caching, and resource delivery
* Profile and tune middleware components (API gateways, message brokers, application servers) for latency and throughput
* Identify bottlenecks across client-side, server-side, and network layers using APM and browser dev tools
* Collaborate with developers to optimize code, queries, and configurations for web performance
* Automate performance tests in CI/CD pipelines and integrate results into dashboards
* Establish KPIs for page load time, time-to-interactive, and API response times
* Document findings and provide actionable recommendations for improving user experience

Required Qualifications

* 5+ years in performance engineering for web-based applications
* Strong programming skills in Java or Python for scripting and automation
* Expertise in performance testing tools (JMeter, Gatling, Locust, k6) for web and API workloads
* Deep understanding of web performance principles: HTTP/HTTPS, CDN, caching, compression, image optimization
* Familiarity with browser performance tools (Chrome DevTools, Lighthouse) and Core Web Vitals
* Experience with APM tools (New Relic, Datadog, Dynatrace) and distributed tracing
* Knowledge of middleware tuning (Tomcat/Jetty, NGINX, API gateways)
* Understanding of network latency, TLS overhead, and resource prioritization