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# Site Reliability Engineer

- **Company:** Insight Global
- **Location:** Brentwood, TN, United States
- **Experience:** Experienced
- **Contract:** Permanent contract
- **Skills:** JavaScript (Programming Language), HTML5, Cascading Style Sheets (CSS), Hypertext Transfer Protocols (HTTP), Systems Development Life Cycle, Reliability Engineering, Next.js, TypeScript, Web Performance Optimization, Web Usability, Link Control Protocol, ReactJS, Caching, Front End Software Development, Dynatrace
- **Published:** October 23, 2026
- **Apply:** https://dejobs.org/x/x/4D84AFA6504C4C94A244C0488F96313F/job/

## About the Role

* 8+ years of frontend engineering experience with 3+ years in web performance optimization. * Expertise in React.js, Next.js, JavaScript/TypeScript, HTML5, and CSS3. * Strong understanding of browser rendering, Core Web Vitals, networking, caching, CDN optimization, and HTTP protocols. * Experience with Lighthouse, Chrome DevTools, WebPageTest, PageSpeed Insights, CrUX, RUM, mPulse, or Dynatrace. * Excellent analytical, troubleshooting, collaboration, and communication skills.

## Description

As part of the Site Reliability Engineering (SRE) team, the Page Performance Engineer is responsible for improving frontend performance across our eCommerce platform by optimizing Core Web Vitals, identifying performance bottlenecks, and driving performance best practices across engineering teams.

Key Responsibilities * Analyze and improve website performance using Core Web Vitals (LCP, INP, CLS). * Investigate rendering, JavaScript, network, caching, image, and browser performance issues. * Perform audits using Lighthouse, Chrome DevTools, WebPageTest, PageSpeed Insights, CrUX, and RUM tools. * Partner with React.js and Next.js teams to optimize rendering, bundle size, code splitting, caching, and asset delivery. * Benchmark performance against leading eCommerce websites and recommend industry best practices. * Define performance standards, monitor regressions, and establish performance governance. * Collaborate with SRE, Product, UX, SEO, Architecture, and Engineering teams to embed performance into the SDLC. * Present actionable recommendations and mentor teams on frontend performance best practices.