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You will get Fix My Slow React/Next.js App – Performance Troubleshooting & Diagnosis
Project details
You’ll get fast, expert-level troubleshooting for your slow React or Next.js application. Whether your issue is a slow load, hydration delay, UI freeze, memory spike, API bottleneck, or long build time – I’ll find the real root cause and guide you to a clear, actionable fix.
I’ve solved performance issues across large-scale platforms and fast-moving startups. I use proven profiling methods (runtime, bundle, API, build diagnostics) to locate bottlenecks that most developers miss.
Each troubleshooting session includes a clear explanation of the problem, recommended fixes, and a Loom walkthrough. Standard and Advanced tiers also include applied fixes and before/after improvements.
If something in your app feels slow, laggy, or unstable – I’ll pinpoint exactly why and help you get it resolved quickly.
I’ve solved performance issues across large-scale platforms and fast-moving startups. I use proven profiling methods (runtime, bundle, API, build diagnostics) to locate bottlenecks that most developers miss.
Each troubleshooting session includes a clear explanation of the problem, recommended fixes, and a Loom walkthrough. Standard and Advanced tiers also include applied fixes and before/after improvements.
If something in your app feels slow, laggy, or unstable – I’ll pinpoint exactly why and help you get it resolved quickly.
Programming Languages
JavaScript, TypeScriptWhat's included
| Service Tiers |
Starter
$500
|
Standard
$1,200
|
Advanced
$2,000
|
|---|---|---|---|
| Delivery Time | 2 days | 5 days | 7 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.
Executive summary (PDF)
+$200Frequently asked questions
About Stepan
Senior Product Engineer | React/Next.js/TS + AI/LLM | Frontend-Heavy
Kyiv, Ukraine - 2:40 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 environment, issue description, and technical setup.
Profiling & Diagnostics
I run targeted profiling to understand what's causing the slowdown.