You will get Full Stack Code Review & Audit
Top Rated
Top Rated
Project details
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 fully trust. I go through it, tell you what is wrong in plain terms, and fix what matters first.
I am a Top Rated Plus full stack developer with a 100% Job Success Score and 7+ years shipping trading platforms, payment flows and financial dashboards. I have debugged production React and Node systems, audited smart contracts down to the bytecode, and untangled real-time data that arrived out of order.
What I check:
• Frontend: React and Next.js render performance, re-render leaks, state and hook bugs, hydration errors, responsive breakpoints.
• Backend: Node.js and API errors, slow or unsafe database queries, race conditions, error-handling and logging gaps.
• Security: exposed keys, missing validation, auth and access-control holes, risky dependencies.
What you get:
• A written report listing every issue by priority, with the cost and risk of each.
• The fixes themselves, applied to your codebase, sized to the tier you pick.
I am a Top Rated Plus full stack developer with a 100% Job Success Score and 7+ years shipping trading platforms, payment flows and financial dashboards. I have debugged production React and Node systems, audited smart contracts down to the bytecode, and untangled real-time data that arrived out of order.
What I check:
• Frontend: React and Next.js render performance, re-render leaks, state and hook bugs, hydration errors, responsive breakpoints.
• Backend: Node.js and API errors, slow or unsafe database queries, race conditions, error-handling and logging gaps.
• Security: exposed keys, missing validation, auth and access-control holes, risky dependencies.
What you get:
• A written report listing every issue by priority, with the cost and risk of each.
• The fixes themselves, applied to your codebase, sized to the tier you pick.
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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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!
ME
Manikya Abhiram E.
May 8, 2026
Crypto wallet developer - with Reactjs/Nextjs/Nodejs - for Crypto webapp POC
Michael is a strong full stack developer and blockchain developer. He was result-oriented from day one, communicated clearly, and delivered great work on time. The final result was exactly what we needed. Highly recommended.
VB
Victor B.
Jun 17, 2025
Help with smart contracts and frontend development
Michael was outstanding — sharp, proactive, and fast. He improved our smart contracts, built a clean and intuitive frontend, and handled all Web3 integrations flawlessly. Communication was smooth, delivery was on time, and the code quality exceeded expectations. Would absolutely work with him again on future project
JA
Jk A.
Jun 10, 2025
Need dev with a good understanding of bytecode and opcode
Really good dev with good understanding on EVM.
DM
Dmitry M.
Jul 18, 2022
Ethereum/Smart Contract Consulting
Michael is knowledgeable Blockchain developer. Unlike other developers I've hired for this position he was much more responsive, which was a great deal.
About Michael
Full Stack Developer | FinTech Platforms & Payments | React & Node.js
100%
Job Success
Kyiv, Ukraine - 2:11 pm local time
✅ FinTech Full stack developer: trading platforms, payment APIs, neobank apps, financial data systems
✅ Real-time data, trading interfaces, and payment integrations | WebSockets, Stripe, REST APIs
✅ 7+ years | Full stack delivery from backend architecture to production UI
✅ 40+ full stack projects delivered | React, Node.js, TypeScript, PostgreSQL, AWS
⭐⭐⭐⭐⭐ "Michael is a strong full stack developer and blockchain developer. He was result-oriented from day one, communicated clearly, and delivered great work on time. The final result was exactly what we needed. Highly recommended." - Stockling
Whether you need a trading platform built from scratch, a payment flow integrated into an existing product, a neobank MVP, or a financial dashboard with real-time data, I own the full delivery.
Ready to start your project? Send me a message and I will respond same day.
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FinTech Development Services & Stack
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▸ Trading Platform Development: order book systems, real-time market data feeds, charting interfaces, position management, P&L dashboards
▸ Payment System Integration: Stripe, PayPal, crypto payment gateways, fiat on-ramp, KYC/KYB flow development, payment reconciliation
▸ Neobank and Banking App Development: account management, transaction history, card management, IBAN integration, open banking APIs
▸ Financial Data Dashboards: real-time data visualization, portfolio tracking, analytics dashboards, reporting systems
▸ DeFi and Web3 FinTech: DEX interfaces, yield farming platforms, staking systems, on-chain payment flows
▸ Frontend Engineering: React and Next.js component architecture, real-time data rendering, responsive production UI, Figma-to-React implementation
As a FinTech developer I build financial products that work correctly and stay fast under real usage. Trading platforms need low-latency data delivery and an interface that does not get in the way of decisions. Payment systems need error handling and reconciliation logic that prevents financial discrepancies. Neobank apps need onboarding flows that pass compliance review. I build for all three requirements at once.
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FinTech Development Tech Stack
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▸ Backend: Node.js, Python, TypeScript, REST API, WebSockets for real-time data, PostgreSQL, Redis
▸ Frontend: React, Next.js, TypeScript, Tailwind CSS, charting libraries, real-time data rendering
▸ Payments: Stripe, PayPal, crypto gateways, open banking APIs, payment reconciliation systems
▸ Real-time & Integrations: WebSocket data feeds, third-party API integration, webhooks, background jobs
▸ Infrastructure: AWS, Docker, GitHub Actions, Vercel, CI/CD pipelines
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Industries
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▸ FinTech and Payments: trading platforms, payment systems, neobanks, financial data products
▸ Web3 and DeFi: decentralized exchanges, on-chain payment flows, crypto FinTech products
▸ SaaS and B2B: financial SaaS platforms, admin dashboards, analytics and reporting tools
▸ Investment and Wealth: portfolio management UIs, investment platform development, financial analytics
I am a FinTech full stack developer specializing in trading platform development, payment system integration, neobank product builds, and financial data applications. My technical stack covers Node.js and Python backends, React and Next.js frontends, PostgreSQL and real-time data pipelines, and payment gateway integration across fiat and crypto. I work across the full stack, which means I take FinTech products from backend architecture through to a polished, production-ready interface in a single engagement.
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Let's Build
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If you need a FinTech full stack developer who owns the build end to end, from backend architecture to production UI, send me a message and let us get started.
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.