You will get Code Review | React developer Node.js developer | Full Stack Developer
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Top Rated
Project details
❗𝐁𝐄𝐅𝐎𝐑𝐄 𝐁𝐔𝐘𝐈𝐍𝐆 𝐓𝐇𝐈𝐒 𝐏𝐑𝐎𝐉𝐄𝐂𝐓❗
Every Client has unique requirements - please let's talk in Upwork Chat before ordering.
About me:
8+ years and 40+ delivered products as a Full Stack Developer (React, Node) across SaaS platforms, AI powered apps, MVPs, and web application delivery.
$4M+ in client revenue impact and 60,000+ active users across the products I have built as a Full Stack Developer React Node.
20,000+ active users on a SaaS platform where Frontend React Developer work lifted engagement by 22%.
I review and fix React, Next.js and Node.js apps that run but do not feel solid. Production errors, slow renders, state that breaks on edge cases, an API that times out, or a codebase you inherited and do not trust. A code review from me tells you what is wrong in plain terms, then I fix what matters first.
Top Rated Plus full stack developer, 100% Job Success, 5.0 from 15 reviews, 8+ years across React and Node.
Every Client has unique requirements - please let's talk in Upwork Chat before ordering.
About me:
8+ years and 40+ delivered products as a Full Stack Developer (React, Node) across SaaS platforms, AI powered apps, MVPs, and web application delivery.
$4M+ in client revenue impact and 60,000+ active users across the products I have built as a Full Stack Developer React Node.
20,000+ active users on a SaaS platform where Frontend React Developer work lifted engagement by 22%.
I review and fix React, Next.js and Node.js apps that run but do not feel solid. Production errors, slow renders, state that breaks on edge cases, an API that times out, or a codebase you inherited and do not trust. A code review from me tells you what is wrong in plain terms, then I fix what matters first.
Top Rated Plus full stack developer, 100% Job Success, 5.0 from 15 reviews, 8+ years across React and Node.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Localization, Security, DesignWhat's included
| Service Tiers |
Starter
$150
|
Standard
$349
|
Advanced
$599
|
|---|---|---|---|
| Delivery Time | 2 days | 4 days | 7 days |
Number of Revisions | 1 | 2 | 2 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
Frequently asked questions
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IG
Iryna G.
Aug 14, 2026
Full Stack Developer Needed — FinTech App Code Review & Audit
Michael was great to work with - professional, reliable, and easy to communicate with. He delivered quality work and I’d be happy to work with him again!
ST
Sebastian T.
Jul 17, 2026
Full-Stack Next.js Developer for Subscription Analytics Dashboard — Ongoing
Another successful project completed with Michael and the Aegas agency. As an excellent full-stack developer, he quickly and efficiently handled the implementation of our activation mail system. Michael is reliable, highly skilled, and delivers clean, high-quality work every time. I look forward to our next collaboration!
ST
Sebastian T.
Jul 14, 2026
Support for OIDC Login
Michael is an absolute professional full-stack developer. He did an outstanding job setting up our Activation Mail and Onboarding system. His communication is top-notch, he grasps project requirements instantly, and his delivery is both fast and high-quality. I highly recommend him and look forward to working together on future milestones!
ST
Sebastian T.
Jul 11, 2026
Add craftnest.org to dashboards
Great experience working with Michael. As a skilled full-stack developer, he successfully added craftnest.org to our dashboards, demonstrating strong expertise in Tableau and analytics. Michael is solution-oriented, detail-oriented, and a clear communicator who delivers high-quality work. Highly recommended!
ST
Sebastian T.
Jun 9, 2026
Full-Stack Next.js Developer for Subscription Analytics Dashboard — Ongoing
Michael did an outstanding job! He fixed our existing dashboards extremely fast and expanded them with new features seamlessly. Communication was super easy and the result is top-notch. Highly recommended!
About Michael
Full Stack Developer | React Developer | Node.js Developer | FinTech
100%
Job Success
Kyiv, Ukraine - 1:13 pm local time
Top Rated Plus, top 3% of talent on Upwork. Full Stack, SaaS and AI Development.
Over 90% of the products I build ship to production, and most are still live and in daily use today.
ABOUT ME
✅ 8+ years and 40+ delivered products as a Full Stack Developer in React and Node, across SaaS platforms, AI apps, MVPs, and web application delivery
✅ $4M+ in client revenue impact and 60,000+ active users across the products I have built
✅ 20,000+ active users on a SaaS platform, where my React Developer work lifted engagement by 22%
✅ 10,000+ users on a healthcare web application, where React Developer ownership cut admin workload by 40%
✅ 15,000+ daily AI prompts processed on an AI platform I built, cutting manual resolution time by 40%
✅ 2,400+ completed orders and 480+ registered customers on an ecommerce and CRM MVP
✅ 90% faster order processing and 80% lower manager workload through workflow automation
✅ Top Rated Plus with a 100% Job Success Score on every contract, backend architecture through to production UI
WHERE I DELIVER
As a Frontend React Developer, 20+ systems with UI development, dashboards, and responsive builds across SaaS platforms, booking platforms, and ecommerce websites.
As a React and Next.js Developer, 15+ launches with 30% faster iteration through design to code and component development.
As a Full Stack Developer React Node, 25+ end to end builds with backend APIs, data architecture, and secure scalable systems from early stage MVP to live SaaS platform.
As a Full Stack Developer React Node, AI powered product builds: chatbots, RAG assistants, and automation with OpenAI, Claude API, FastAPI, and vector databases.
As a Full Stack Developer, 12+ backend heavy products with 28% lower delivery risk on Node.js and Python.
As a Full Stack Developer React Node, 6 to 18 month engagements as a long term development partner: scale existing platforms, professionalize, review, improve, and launch.
INDUSTRY IMPACT
SaaS Platform, B2B, Two Sided Marketplace: 50,000+ active listings, 35% higher conversion, and $2M+ in monthly transaction volume as a Full Stack Developer React Node.
Healthcare, Clinic Management SaaS, Telehealth: 10,000+ active users, 500+ daily appointments processed, and 15% fewer patient no shows as a Frontend React Developer maintaining 99.9% uptime.
AI Powered: 5+ products deployed with custom AI agents, chatbots, and RAG systems on OpenAI, Claude API, and FastAPI, processing 15,000+ daily prompts and cutting manual resolution time by 40%.
Logistics, ERP, Internal Workflow: up to 12 hours saved per order cycle, 30% faster reporting, and 40% fewer data entry errors across 5+ regional hubs as a Full Stack Developer React Node.
Fintech, LegalTech, PropTech MVP: 40% higher retention over 6 months and role based access for 5,000+ users through Frontend React Developer work.
Clients typically work with me when they need:
- a Full Stack Developer who can own frontend and backend
- a SaaS Developer who understands long-term scalability constraints
- a Backend Developer experienced with real production systems
- mobile app developer and React developer experience as a software developer
- backend services built with Node.js or Python by an experienced Python developer
- web applications with complex workflows and business rules from a senior web developer
- API-driven architectures and third-party integrations
- SaaS platforms designed to support growth, analytics and SaaS marketing data needs
- MVPs that can realistically evolve into long-term SaaS products
HOW I BUILD
Frontend as a React Developer: React, Next.js, TypeScript, JavaScript, Tailwind CSS, Redux, HTML5, CSS3, responsive design, real time UI.
Full stack and backend as a Full Stack Developer React Node: Node.js, Python, ASP.NET, PostgreSQL, MySQL, MongoDB, Redis, REST API, WebSockets, Stripe, payment, auth, and third party API integrations.
AI as a Full Stack Developer: OpenAI, Claude API, FastAPI, RAG, vector databases, LangChain, AI agents, chatbots, and workflow automation.
Also across the stack: Vue, Supabase, Firebase, Docker, AWS, Vercel, CI/CD, software architecture, and end to end delivery from MVP to live platform.
Steps for completing your project
After purchasing the project, send requirements so Michael can start the project.
Delivery time starts when Michael receives requirements from you.
Michael works on your project following the steps below.
Revisions may occur after the delivery date.
Scope and repo access
I confirm the tier, get repo access, and run your app locally to reproduce the issues.
Code audit
I review architecture, API design, database queries, TypeScript usage, performance, and security, logging every issue.