You will get React Code Review & Performance Audit
Top Rated
Top Rated
Project details
I'll review your React/Next.js codebase for performance issues, security risks, and maintainability problems - and give you a clear roadmap to fix them.
What you get:
• Full codebase audit (frontend only or full stack)
• Performance bottlenecks identified (rendering, bundle size, API calls)
• Security issues flagged (XSS, exposed keys, auth)
• Code quality assessment (structure, patterns, reusability)
• Prioritized fix list with time estimates
• 30-minute walkthrough call
What you get:
• Full codebase audit (frontend only or full stack)
• Performance bottlenecks identified (rendering, bundle size, API calls)
• Security issues flagged (XSS, exposed keys, auth)
• Code quality assessment (structure, patterns, reusability)
• Prioritized fix list with time estimates
• 30-minute walkthrough call
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$500
|
Standard
$750
|
Advanced
$1,000
|
|---|---|---|---|
| Delivery Time | 3 days | 4 days | 5 days |
Number of Revisions | 1 | 1 | 2 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
7 reviews
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Natallia N.
Jul 31, 2026
30 minute consultation
Really enjoyed the consultation with Evgenii. He's an experienced Mobile App Developer who helped me think through the architecture and MVP development before writing any code. The feedback was practical, honest, and saved me from making a few bad decisions early on. If you're looking for someone to review your idea, recommend the right Flutter architecture, and help plan your mobile app, I definitely recommend working with him.
ID
Ivans D.
Jul 20, 2026
30 minute consultation
Great consultation with an experienced Mobile App Developer. We discussed Mobile App Development, application architecture, backend options, scalability, and the pros and cons of Hybrid App Development vs Native App Development. The advice was practical, easy to understand, and helped me make the right technical decisions before starting development. I highly recommend them to anyone planning a mobile app project.
HW
Heinrich W.
Jun 29, 2026
30 minute consultation
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Natallia N.
Jun 18, 2026
30 minute consultation
Very knowledgeable, easy to communicate with, and provided valuable insights for our Flutter project. Answered all our questions and helped us make better technical decisions. Highly recommend!
ID
Ivans D.
May 26, 2026
Full Stack Consulting (React / Python / C#)
Evgenii came in, took one look at our mess of React, Python, and C#, and actually fixed it. The system stopped crashing, the API got faster, integrations started working. We'd hire him again!
About Evgenii
Full-Stack Developer, MVP | React Full-Stack Developer | Python, React
100%
Job Success
Astana, Kazakhstan - 8:11 am local time
Built mobile apps used by 15M+ users | Launched FinTech MVP in 3 months | Build iOS & Android apps that scale from MVP to millions
𝟏𝟎+ 𝘆𝗲𝗮𝗿𝘀 𝗯𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝘀. I focus on architecture first - so your MVP becomes a long-term foundation, not a rewrite.
I work across React, Next.js, TypeScript, Python, FastAPI, Kotlin, Swift, and .NET - owning everything from APIs to mobile apps to cloud deployment.
🔥 𝗛𝗲𝗿𝗲'𝘀 𝘄𝗵𝗮𝘁 𝗜 𝗱𝗲𝗹𝗶𝘃𝗲𝗿:
- Full Stack React Development - React, Next.js, TypeScript, Tailwind, Material UI
- Python Backend - FastAPI, Django, PostgreSQL, Redis, Docker, Kubernetes
- Mobile Apps - iOS & Android, Kotlin, Swift, KMP, Flutter, Tauri
- AI & Computer Vision - Python, PyTorch, YOLO, real-time video analytics
- Cloud & DevOps - AWS, Docker, Kubernetes, CI/CD, monitoring, logging
🔥 𝗥𝗲𝗰𝗲𝗻𝘁 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀:
- 𝗙𝗦𝗠 𝗦𝗮𝗮𝗦 - multi-tenant field service platform with React frontend, PostgreSQL backend, and cross-platform mobile app for field engineers. Full work-order lifecycle, offline sync, role-based access.
- 𝗟𝗮𝘂𝗻𝗱𝗿𝗼𝗺𝗮𝘁 𝗜𝗼𝗧 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺 - customer app + operator dashboard with IoT integration, online payments, real-time machine control. Next.js, FastAPI, PostgreSQL. 50+ locations.
- 𝗩𝗜𝗝𝗨 - industrial telemetry system with 24/7 monitoring, anomaly detection, real-time alerts, and live dashboards. React, Python, .NET Core, microservices.
- 𝗚𝗿𝗶𝗻𝗲𝗼 𝗙𝗶𝗻𝗧𝗲𝗰𝗵 𝗪𝗮𝗹𝗹𝗲t - launched secure MVP in 3 months (50% faster than industry average) with PassKey encryption, KYC, Visa card integration.
- 𝗙𝘅𝗣𝗿𝗼 𝗧𝗿𝗮𝗱𝗶𝗻𝗴 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺 - architected native mobile apps and high-load backend for 15M+ download trading platform. International award-winning.
- 𝗣𝗣𝗘 𝗗𝗲𝘁𝗲𝗰𝘁𝗶𝗼𝗻 𝗦𝘆𝘀𝘁𝗲𝗺 - real-time AI safety monitoring on construction sites using YOLO and PyTorch.
100% Job Success | Top Rated on Upwork
📩 𝗦𝗲𝗻𝗱 𝗺𝗲 𝗮 𝗺𝗲𝘀𝘀𝗮𝗴𝗲 𝘄𝗶𝘁𝗵 𝗮 𝗯𝗿𝗶𝗲𝗳 𝗱𝗲𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻 𝗼𝗳 𝘆𝗼𝘂𝗿 𝗽𝗿𝗼𝗷𝗲𝗰𝘁 𝗮𝗻𝗱 𝗜'𝗹𝗹 𝗿𝗲𝘀𝗽𝗼𝗻𝗱 𝘄𝗶𝘁𝗵𝗶𝗻 𝗮 𝗳𝗲𝘄 𝗵𝗼𝘂𝗿𝘀 𝘄𝗶𝘁𝗵 𝗮 𝗰𝗹𝗲𝗮𝗿 𝗻𝗲𝘅𝘁 𝘀𝘁𝗲𝗽!
Updated - August 18
Steps for completing your project
After purchasing the project, send requirements so Evgenii can start the project.
Delivery time starts when Evgenii receives requirements from you.
Evgenii works on your project following the steps below.
Revisions may occur after the delivery date.
Repository Access & Requirements
Client provides access to the code repository and shares any known issues, performance concerns, or specific areas they want me to focus on.
Codebase Review
I review the entire React/Next.js codebase - component structure, state management, API integration, routing, and overall architecture.