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You will get React & Next.js Performance Audit – Speed, Core Web Vitals, Bundle Size
Project details
You’ll get a clear, actionable performance audit for your React or Next.js app – focused on real bottlenecks and fast wins. No generic reports. I’ll show you exactly what’s slowing your app down and what to fix first.
I’ve worked on large-scale web platforms and fast-moving startups, solving issues like slow loads, bad Core Web Vitals, heavy bundles, hydration delays, runtime freezes, and long builds.
Your audit includes CWV analysis, bundle/hydration breakdown, runtime profiling, backend/API checks, and a prioritized Top 5 fixes list – plus a Loom walkthrough and review call. If your app feels slow or unstable, I’ll pinpoint why.
I’ve worked on large-scale web platforms and fast-moving startups, solving issues like slow loads, bad Core Web Vitals, heavy bundles, hydration delays, runtime freezes, and long builds.
Your audit includes CWV analysis, bundle/hydration breakdown, runtime profiling, backend/API checks, and a prioritized Top 5 fixes list – plus a Loom walkthrough and review call. If your app feels slow or unstable, I’ll pinpoint why.
Programming Languages
JavaScript, TypeScriptWhat's included
| Service Tiers |
Starter
$600
|
Standard
$1,500
|
Advanced
$3,000
|
|---|---|---|---|
| Delivery Time | 3 days | 7 days | 12 days |
Number of Revisions | 0 | 1 | 1 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
Optional add-ons
You can add these on the next page.
Extra User Flow / Screen / Route Audit
(+ 2 Days)
+$500
Executive Summary Slide Deck
(+ 1 Day)
+$500
Extra 30-min Review Call
+$300Frequently asked questions
About Stepan
Senior Product Engineer | React/Next.js/TS + AI/LLM | Frontend-Heavy
Kyiv, Ukraine - 12:02 pm local time
I’m a senior product engineer (8+ years of professional experience), frontend-heavy by strength, with strong backend and architecture skills. I’m best when the product has complex UI/runtime behavior, messy edge cases, performance bottlenecks, or needs to move from “works in demos” to production-ready.
What I’m especially good at:
Complex frontend systems (React / Next.js / TypeScript)
- client-side business logic
- state/data flow architecture
- real-time UI behavior
- performance optimization
- reliability under edge cases
End-to-end product delivery
- Node.js / APIs / DB integration
- auth, permissions, multi-tenant concerns
- deployment + production hardening
AI-native product engineering
- LLM / agent integrations (code-first)
- tool calling / orchestration
- evals / tracing / observability
- AI product UX and reliability tradeoffs
Typical work I do
- Stabilize and harden an AI product MVP for production
- Build complex product features end-to-end (frontend-heavy)
- Fix performance / rendering / state / architecture problems
- Implement agentic workflows and production integrations
- Improve dev velocity and shipping quality in messy codebases
How I work
I use modern AI dev tools (Claude Code + Codex / agents / AI-assisted workflows) to move faster, but I’m not a “vibe coder.” You hire me for engineering judgment, architecture, and production-quality execution.
Good fit if you need someone who can:
- own a feature or workstream with minimal supervision
- handle frontend complexity without duct tape
- go end-to-end when needed
- communicate clearly and ship reliably
If you already have something working but it’s fragile / slow / hard to extend — that’s exactly the kind of work I’m strongest at.
Steps for completing your project
After purchasing the project, send requirements so Stepan can start the project.
Delivery time starts when Stepan receives requirements from you.
Stepan works on your project following the steps below.
Revisions may occur after the delivery date.
Initial Review
I review your app, key flows, and technical setup to understand where performance and stability issues are most likely to appear.
Profiling & Diagnostics
I run a structured analysis: Core Web Vitals, bundle and hydration breakdowns, runtime profiling, API latency checks, and build/CI diagnostics.