You will get Next.js Performance Optimization | Lighthouse Score & PageSpeed Audit
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Project details
A slow website costs you rankings, conversions, and users — Google uses Core Web Vitals as a direct ranking signal, and every second of load time reduces the chance someone stays on your page.
As a full stack developer I audit your Next.js site against Lighthouse and PageSpeed Insights and fix exactly what's dragging your score down — font loading strategy, image lazy loading and size optimization, Suspense boundaries and correct preloaders, color contrast issues, unused JavaScript, render-blocking resources, and proper caching configuration.
Today I took a client's Next.js platform from a Lighthouse score of 63 to 98 in a single working session. That kind of improvement directly affects how Google indexes your site, how fast it feels to real users, and how it ranks against competitors with similar content.
This is not a report. This is a full stack developer audit with fixes delivered — you receive an optimised, production-ready site with documented changes and the reasoning behind each one.
Stack: Next.js, Vercel, Lighthouse, PageSpeed Insights, Core Web Vitals.
As a full stack developer I audit your Next.js site against Lighthouse and PageSpeed Insights and fix exactly what's dragging your score down — font loading strategy, image lazy loading and size optimization, Suspense boundaries and correct preloaders, color contrast issues, unused JavaScript, render-blocking resources, and proper caching configuration.
Today I took a client's Next.js platform from a Lighthouse score of 63 to 98 in a single working session. That kind of improvement directly affects how Google indexes your site, how fast it feels to real users, and how it ranks against competitors with similar content.
This is not a report. This is a full stack developer audit with fixes delivered — you receive an optimised, production-ready site with documented changes and the reasoning behind each one.
Stack: Next.js, Vercel, Lighthouse, PageSpeed Insights, Core Web Vitals.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, DesignWhat's included
| Service Tiers |
Starter
$300
|
Standard
$600
|
Advanced
$1,000
|
|---|---|---|---|
| Delivery Time | 2 days | 5 days | 7 days |
Number of Revisions | 1 | 2 | 2 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | |
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$100 - $200
Additional Revision
+$50
Ongoing Performance Monitoring
+$150
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GP
Gerard P.
Jun 20, 2026
AWS Migration Review
Great work as usual!
MD
Matt D.
Jun 15, 2026
30 minute consultation
Working with Svitlana was a great experience. She has a real talent for breaking down complex topics and explaining them in simple, easy-to-understand terms. Beyond just answering my questions, she proactively came up with solutions to current problems and suggested smart alternatives that worked even better than what I'd originally planned. She helped me get a much clearer handle on my software and GHL account. I'd happily work with her again and highly recommend her.
CG
Carter G.
May 19, 2026
Lead Full-Stack Developer | Next.js, React, Node.js, PostgreSQL
Svitlana has been exceptional to work with. She is highly responsive, detail oriented, and consistently focused on solving problems rather than creating them. She took ownership of both CarCupid and K9Cupid quickly, communicated clearly throughout the process, and handled complex technical and UX challenges with professionalism and accountability.
What stood out most was her ability to think beyond simply completing tasks. She actively contributed ideas to improve the products, streamline workflows, and create a better user experience overall. Her work quality, reliability, and strategic mindset made her feel more like a true partner than just a developer. I would confidently recommend her to anyone building a serious long term project.
What stood out most was her ability to think beyond simply completing tasks. She actively contributed ideas to improve the products, streamline workflows, and create a better user experience overall. Her work quality, reliability, and strategic mindset made her feel more like a true partner than just a developer. I would confidently recommend her to anyone building a serious long term project.
HS
Hussain S.
May 9, 2026
Technical Handover Specialist
GP
Gerard P.
Apr 21, 2026
Roadmapping and Technical Analysis of Feature complexitity using Ai tools
Svitlana is a joy to work with. She will consistently exceed your expectations and surprise you with her speed. I plan to continue working with her because she's great.
About Svitlana
Full Stack Developer | SaaS Developer | Dashboard Developer
100%
Job Success
Bexhill-on-Sea, United Kingdom - 3:02 am local time
I am a full stack developer, SaaS developer, and dashboard developer in the UK — Top Rated Plus on Upwork, top 3% globally. I build systems that run businesses — working platforms with real users, real transactions, and business impact.
As a full stack developer I own the entire stack — PostgreSQL design, Node.js and Nest.js backend, React and Next.js frontend, REST API integrations, Stripe payments, and Vercel deployment. Need a full stack developer, SaaS developer, or dashboard developer who owns the technical side — architecture, payments, integrations, deployment, security? Let's talk.
My recent full stack developer work includes a SaaS platform for trades businesses — a Next.js app with job management, client records, quoting, and role-based access. I also built a B2B admin dashboard across PostgreSQL, Node.js, and React — the tool a team of 20 depends on every day.
SaaS developer. Multi-tenant. Production-ready.
As a SaaS developer I delivered a multi-tenant SaaS starter on Next.js with Stripe subscriptions, PostgreSQL via Neon, role-based access, billing portal, and team invites — fully documented, repo transferred on handover. I led a full platform rebuild migrating a legacy PHP and WordPress stack to a modern Next.js and Nest.js architecture — 40% improvement in user engagement post-launch.
Backend developer. Nest.js. PostgreSQL.
As a backend developer I build production Nest.js and Node.js APIs on PostgreSQL with TypeScript end to end. My recent backend work includes a Nest.js and PostgreSQL backend for a raffle SaaS platform — secure JWT authentication, OAuth provider integration, password reset and recovery flows, and a clean REST API layer for a Next.js and React frontend. Backend work that has to be correct: every endpoint authenticated, every role enforced, every PostgreSQL query written with isolation in mind.
Security audit. Supabase RLS. Multi-tenant isolation.
As a full stack developer and technical consultant I run pre-launch security audits for SaaS founders — the review that must happen before real customer data goes live. My security audit work covers Supabase Row Level Security (RLS), multi-tenant isolation, PostgreSQL policy design, and authentication flows. I've audited a multi-tenant property maintenance SaaS on Supabase, reviewing RLS policies and tenant data separation. On another platform I found RLS policies that lived only in discarded migrations, never applied to the database — the silent multi-tenant data leak an audit catches before a breach. If you're a SaaS founder on Supabase, Next.js, or PostgreSQL and aren't certain your tenant data is isolated, that's the audit I do.
Dashboard developer. Data that changes decisions.
As a dashboard developer with a KendoReact commercial licence I build enterprise-grade interfaces standard React developers can't replicate — advanced data grids, real-time charts, and complex forms that perform under load. My dashboard developer portfolio includes a marketing analytics dashboard with AI insights that cut campaign review time by 60% for a British agency, and a SaaS analytics dashboard with Chart.js and PDF export that replaced a weekly manual reporting process.
Integrations. Authentication. Infrastructure.
OAuth integration and API authentication developer portal config — credential flows for Google, GitHub, and custom providers using NextAuth, Nest.js, and JWT. Google Tag Manager setup with GA4 and Meta Pixel across complex Next.js applications, with GTM as the management layer for non-technical teams. Transactional email wired to Resend and Brevo, plus Next.js blog and CMS setup with Sanity Studio.
Stripe. Payments. Automation.
Payment systems are a core part of my full stack developer work. I built a Stripe internal payment interface with role-based access on Next.js — PaymentIntent flow, full audit log, zero card data stored. I delivered Stripe payment integration with webhooks and subscription billing handling upgrades, downgrades, and failed payment recovery. I wire Stripe with Make, GoHighLevel, and Google Sheets so every transaction triggers the right email, CRM tag, and notification.
Technical consultant. Architecture. Audit.
I work as a technical consultant for non-technical founders. My tech stack and architecture audit with written report shows founders what they have, what's broken, and what to build next — vendor selection, architecture decisions, developer estimate review, security and multi-tenant isolation review, and a roadmap.
As a Next.js performance optimization specialist I audit and improve Lighthouse and PageSpeed results — render-blocking resources, Core Web Vitals, and measurable gains for user experience and search ranking.
Next.js · React · Node.js · Nest.js · PostgreSQL · Supabase · TypeScript · JavaScript · REST API · Stripe · Kendo UI · Sanity · Make · GoHighLevel · Vercel · NextAuth · JWT · OAuth · RLS · Chart.js · GA4 · Meta
Steps for completing your project
After purchasing the project, send requirements so Svitlana can start the project.
Delivery time starts when Svitlana receives requirements from you.
Svitlana works on your project following the steps below.
Revisions may occur after the delivery date.
Audit
I run a full Lighthouse and PageSpeed audit across your key pages — Performance, Accessibility, Best Practices, and SEO — and document every issue with priority ranking.
Fix Plan
I identify the highest-impact fixes — image optimization, font loading, lazy loading, Suspense boundaries, render-blocking resources, and colour contrast issues.