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USD
I will optimize next js or react app performance and fix bugs
Iryna H
About this gig
Is your React or Next.js app running slow, crashing, or failing Lighthouse audits?
Poor frontend performance directly leads to high user churn and lost revenue. As a Senior Frontend Engineer with 10+ years of experience, I specialize in diagnosing critical architectural bottlenecks, fixing complex state management conflicts, and boosting web performance to Lighthouse 90+.
What I can solve for you:
- Performance & Core Web Vitals: Eliminating unnecessary re-renders, optimizing heavy Canvas/SVG animations, fixing frame-rate drops.
- State Management Architecture: Resolving complex bugs in Redux (Saga/Thunk), MobX, Zustand, or Context API.
- Next.js & React Debugging: Fixing SSR/SSG hydration errors, routing issues, memory leaks, and broken API integrations.
- Codebase Stabilization: Refactoring legacy code according to SOLID and DRY principles without breaking production.
Why choose me?
- 10+ years of engineering experience delivering enterprise-grade web platforms.
- Proven track record of accelerating dashboard load times from 3.2s to 1.1s.
- Clean, maintainable code with zero technical debt.
Please message me with a short description of your issue before placing an order!
Get to know Iryna H
Iryna H
Senior React WooCommerce Developer
- FromGermany
- Member sinceSep 2025
Languages
German
🎯 Stop technical debt before it kills your product. With 10 years of engineering experience, I specialize in stabilizing complex React/Next.js systems and building scalable SaaS architectures that actually perform.
My background is rooted in established IT companies (MobiDev, AltexSoft, Softengi), where I’ve mastered the art of delivering production-ready code that stands the test of time.
📊 Proven Results
• Reduced dashboard load time from 3.2s → 1.1s (Lighthouse 68 → 95)
• Built custom WooCommerce plugins used in daily prod workflows
• Delivered stable modules for POS
My Portfolio
Other Software Development Services I Offer
FAQ
How do you guarantee a Lighthouse score of 90+ or significantly faster load times?
I perform a deep architectural audit of your application to identify real bottlenecks—such as main-thread blocking, unnecessary re-renders, unoptimized assets, or heavy hydration. I then rewrite critical code paths following SOLID principles to achieve measurable improvements on both mobile and desk
Will optimizing performance or refactoring state management break my existing app features?
No. As a Senior Engineer with 10+ years of experience, I write clean, surgical, and modular code. I focus on root-cause fixes rather than dirty hacks, ensuring full feature regression and component stability before any deployment.
Do I need to share full source code access or repository permissions with you?
Having access to your GitHub/GitLab repository or a staging environment allows me to profile performance in a realistic setting and deliver the best results. All code shared with me is kept 100% confidential and secure.
Can you resolve complex Next.js SSR hydration errors and memory leaks?
Yes! I specialize in resolving complex Next.js/React framework issues, including hydration mismatches, memory leaks, broken routing, and state synchronization conflicts across Redux, MobX, Zustand, or Context API.
What if I’m not sure which package (Basic, Standard, or Premium) is right for my application?
Just send me a direct message with a link to your live site, repository, or PageSpeed test! I will conduct a quick preliminary review and recommend the exact package or send a tailored Custom Offer.
