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I will improve react and nextjs core web vitals and page speed
Rajender J
About this gig
Slow React and Next.js experiences lose users before the page becomes useful. I will profile your real application, identify the code and delivery bottlenecks behind poor Core Web Vitals, LCP, INP, CLS, slow JavaScript, images, fonts, caching, or hydration, and implement targeted fixes.
What you receive:
- a measured baseline and prioritized findings
- code-level React or Next.js performance improvements
- desktop and mobile validation
- a clear before-and-after report
- practical notes for keeping the gains
I focus on real causes rather than hiding content or chasing a cosmetic PageSpeed score. Depending on the agreed package, work may include rendering analysis, bundle reduction, lazy loading, image and font optimization, caching, third-party script control, and layout stability fixes.
Results depend on hosting, third-party scripts, data sources, and application architecture. Please message me before ordering a complex, authenticated, ecommerce, or high-traffic application so I can confirm scope and access requirements.
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know Rajender J
Rajender J
Engineering Manager
- FromIndia
- Member sinceJul 2026
Languages
English, Hindi
I am a hands-on engineering leader with over 9 years of experience building and scaling full-stack products and distributed systems. I currently lead 25–30 engineers across multiple pods, focusing on architecture, developer productivity, and cross-functional delivery for high-traffic consumer applications.
My Portfolio
FAQ
Do you guarantee a PageSpeed or Core Web Vitals score?
No. I guarantee a professional audit, scoped fixes, and transparent validation. Final scores also depend on hosting, content, third-party scripts, network conditions, and field traffic.
Will you work directly on my live website?
A staging environment is preferred. I can prepare a reviewed patch or work in your approved development and deployment workflow after access and rollback expectations are confirmed.
Do you support both React and Next.js applications?
Yes. I work with plain React and Next.js applications. The exact optimization approach depends on your framework version, rendering mode, deployment platform, and current architecture.
What access and information do you need to start?
I need the important URLs, repository or source access, framework and deployment details, known constraints, and preferably a safe staging environment. Please never send secrets in chat.
Will the optimization change my design or functionality?
I preserve the intended design and user flows. If a performance issue requires a visible tradeoff or third-party feature change, I will explain it and get approval before implementing it.
