You will get Next.js Performance Audit | React Web App Speed Optimization
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If your Next.js application suffering from slow load times, high latency, or poor SEO rankings, I can help.
I specialize in deep performance auditing and React optimization. I don’t just look at Lighthouse scores; I analyze your hydration patterns, bundle sizes, and server-side rendering logic to identify real-world bottlenecks.
I audit complex React components, hook dependencies, and data-fetching strategies. Whether you are battling excessive re-renders, slow API responses, or inefficient state management, I provide a clear, actionable plan to fix it. I help you implement advanced caching, optimize edge functions, and restructure your component tree for maximum speed. From auditing database query costs to refining your critical path rendering, I ensure your application feels instant under heavy traffic.
I solve technical bottlenecks in:
• Next.js SSR/SSG/ISR optimization strategies
• React re-render debugging & bundle size reduction
• Hydration issues & Core Web Vitals improvement
• Advanced caching, edge middleware & API latency
• Database query performance & caching layers
• Client-side vs. server-side boundary execution
I specialize in deep performance auditing and React optimization. I don’t just look at Lighthouse scores; I analyze your hydration patterns, bundle sizes, and server-side rendering logic to identify real-world bottlenecks.
I audit complex React components, hook dependencies, and data-fetching strategies. Whether you are battling excessive re-renders, slow API responses, or inefficient state management, I provide a clear, actionable plan to fix it. I help you implement advanced caching, optimize edge functions, and restructure your component tree for maximum speed. From auditing database query costs to refining your critical path rendering, I ensure your application feels instant under heavy traffic.
I solve technical bottlenecks in:
• Next.js SSR/SSG/ISR optimization strategies
• React re-render debugging & bundle size reduction
• Hydration issues & Core Web Vitals improvement
• Advanced caching, edge middleware & API latency
• Database query performance & caching layers
• Client-side vs. server-side boundary execution
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$300
|
Standard
$950
|
Advanced
$2,800
|
|---|---|---|---|
| Delivery Time | 2 days | 5 days | 8 days |
Number of Revisions | 0 | 0 | 0 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
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SD
Shelomo D.
Oct 25, 2024
Full Stack Developer
Working with Sergey has been a great experience. His commitment and professional attitude ensure that every project is done well and on time. Sergey consistently provides clear and organized ideas, which improve our teamwork and lead to excellent outcomes. His skill in aligning with our goals makes him an essential partner. I highly recommend Sergey and can't wait to collaborate with him again.
SD
Shelomo D.
Jan 11, 2023
Fullstack Developer
Sergey has shown excellent technical skills and a solid understanding of software development principles. Their coding is clean and well-organized, with a focus on maintainability and scalability. He works well in a team, and are able to effectively communicate and collaborate with other team members. He has also shown a strong ability to learn new technologies and adapt to changing requirements.
YB
Yonatan B.
May 31, 2021
Full Stack | React & Node.js
Sergey is an absolute asset. Dedicated, communicative and highly professional developer. It was a pleasure working with him for so long. We hope to extend our work in future projects. We highly recommend Sergey as a full stack developer.
YB
Yonatan B.
Nov 30, 2020
Full Stack Needed | React & Node.js
Sergey has proved himself to be one of the best developers we ever worked with. Communication is great, execution is stellar and the quality of work is amazing. Would highly recommend hiring him for complex projects. Looking forward to our next project!
RS
Ruslan S.
Nov 2, 2020
Senior JavaScript Developer
Sergey is a responsible and professional developer who moved us to the next level in terms of code quality and architecture, thank you!
About Serhii
Senior AI Full-StackDeveloper | Next.js, Node.js | SaaS, AI agents
100%
Job Success
Zaporizhzhya, Ukraine - 3:59 am local time
With 12+ years of engineering and 100+ delivered projects, I build robust Next.js and NestJS systems that don't break under heavy traffic.
Whether you need a rock-solid Next.js frontend, a NestJS modular backend, or secure Stripe subscription billing logic, I build systems that perform from day one. No fluff, no endless project management layers - just direct engineering execution.
What I build & scale:
Full Stack SaaS apps: React, Next.js, Node.js, and TypeScript architectures.
AI & RAG pipelines: custom AI agents, LangChain integrations, smart model routing, and vector databases.
Payment orchestration: Stripe subscriptions, multi-provider routing, idempotency, and webhook handling under load.
Backend performance: PostgreSQL, MySQL, AWS, and Redis caching layers with strict security boundaries.
📊 Proven track record:
AI-powered CRM & SaaS: Shipped a custom React app in 6 weeks, handling 500K+ enterprise documents inside an optimized pgvector/langChain pipeline while cutting infrastructure costs by 40%.
B2B E-commerce & FinTech: executed seamless payment migrations and built Stripe graduated pricing subscription architectures with 0% transaction failure rates.
100+ Successful Deliveries: backed by 12+ years of hands-on engineering experience and a 100% success mindset.
Let's build your scalable MVP or perform a thorough security and performance pass.
Send a message or hit Invite to schedule a quick introduction chat today.
Steps for completing your project
After purchasing the project, send requirements so Serhii can start the project.
Delivery time starts when Serhii receives requirements from you.
Serhii works on your project following the steps below.
Revisions may occur after the delivery date.
Strategic Execution & Performance Audit
Depending on your selected tier, I perform a performance audit or implement optimization fixes. I apply performance-first patterns, resolve latency bottlenecks, and tune your app for scale to match your specific requirements.