You will get backend expert that will review your authentication flow
Top Rated
Project details
You will get a focused review of one authentication flow in your web app, SaaS product, MVP, marketplace, dashboard, or internal tool.
A backend expert from my team will review the materials you provide and prepare a short written report with the most important authentication risks, logic issues, and recommended next steps.
This is not a full security audit or development package. It is a quick expert review designed to help you understand whether your login, signup, password reset, session, token, role, or permission logic has obvious weak points before you continue development or launch.
The review can cover login flow, signup flow, password reset, JWT/session handling, role-based access, permission logic, API access risks, user data exposure, and maintainability.
This package is a good fit if your authentication already works but you want a fresh technical eye before launch, scaling, or adding more sensitive user data
A backend expert from my team will review the materials you provide and prepare a short written report with the most important authentication risks, logic issues, and recommended next steps.
This is not a full security audit or development package. It is a quick expert review designed to help you understand whether your login, signup, password reset, session, token, role, or permission logic has obvious weak points before you continue development or launch.
The review can cover login flow, signup flow, password reset, JWT/session handling, role-based access, permission logic, API access risks, user data exposure, and maintainability.
This package is a good fit if your authentication already works but you want a fresh technical eye before launch, scaling, or adding more sensitive user data
Programming Languages
HTML & CSS, JavaScript, TypeScriptWhat's included $15
These options are included with the project scope.
$15
- Delivery Time 1 day
- Number of Revisions 1
Frequently asked questions
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TN
Taras N.
Jun 27, 2026
Senior Full-Stack Developer - React, Node.js SaaS Performance Check
YA
Yulia A.
Jun 25, 2026
Website Performance Review
Koitechs team did a solid code review and really helped me stabilize the project. Quick turnaround, no unnecessary back-and-forth. Would definitely recommend and reach out again.
TL
Tamara L.
Jun 15, 2026
You will get review your Stripe payment flow and integration setup
Yuliia and her experts helped witg stripe-related fixes, and other full stack updates.
They picked up tasks quickly, met the agreed deadlines, and kept communication clear, friendly, and professional throughout the project.
They picked up tasks quickly, met the agreed deadlines, and kept communication clear, friendly, and professional throughout the project.
HV
Heorhii V.
Jun 12, 2026
Full Stack React Node js developer
great job again! realy accountable person!👍
ID
Ivan D.
Jun 12, 2026
You will get Mobile App Flow Review
Yulia and her team did great work on creating build and release process for our enterprise-level React Native mobile app. Yulia's team is focused on the result and delivers the highest quality.
About Yuliia
Front End Developer React | Full Stack Developer React Node | AM
94%
Job Success
Zaporizhzhia, Ukraine - 3:36 pm local time
I help companies hire in-house, CTO-approved engineers who join fast, take ownership, and deliver production-ready software.
✅ 9+ years in software development
✅ 155+ web and mobile projects delivered
✅ 20,500+ Upwork hours in React / Next.js / Node.js / React Native
✅ 75% repeat clients
✅ Engineer matching in 24 hours or less
✅ 2-week trial period
✅ 35+ in-house engineers
✅ 40+ MVPs released
✅ Products supported by our team include platforms with 5M+ daily users
🚀 React / Next.js / Full Stack
We build SaaS platforms, marketplaces, dashboards, admin panels, CRMs, AI products, and scalable web apps using React, Next.js, Node.js, TypeScript, Supabase, PostgreSQL, Firebase, MongoDB, REST API, GraphQL, Stripe, OAuth, WebSockets, AWS, Vercel, and Docker.
Our team is a strong fit if you need a react developer , web developer , full stack developer , nextjs developer, mern developer, or backend engineer.
We help with MVP development, legacy code takeover, architecture modernization, Core Web Vitals, API integrations, payments, auth, subscriptions, user roles, and production launch.
📱 React Native / Mobile
We build and support iOS and Android apps using React Native, Expo, Firebase, Supabase, Node.js, and API-driven architecture.
We can help if you need a react native developer , mobile app developer, iOS / Android support, app takeover, mobile maintenance, push notifications, App Store / Google Play releases, payments, or backend integrations.
We also support mixed mobile environments with flutter developer , android developer , backend developer, AI developer, or web developer.
🤖 AI SaaS / AI App Development
We build AI-powered products connected to real business workflows.
Experience: AI SaaS, AI MVPs, AI chatbot development, AI agent development, OpenAI API, Claude API, LLM prompt engineering, RAG, automation, web scraping, AI model integration, copilots, and AI workflow validation.
AI stack: OpenAI API, Claude API, LLMs, RAG, AI Agent Development, AI Chatbot, Generative AI, Python, FastAPI, Supabase, PostgreSQL, pgvector, automation, data analysis, web scraping.
🧩 Mixed-Stack Support
Our core focus is React, Next.js, Node.js, React Native, TypeScript, Supabase, and AI. We also support products involving wordpress , vue , angular , python developer , scala developer , flutter developer , android developer , mern , and other web/mobile technologies.
🏆 Industries
📦 Logistics - 5+ projects: tracking, shipment dashboards, carrier/shipper workflows, maps, route visibility.
🏥 HealthTech -4+ projects: medical booking, clinic platforms, patient flows, admin systems.
🛒 Marketplaces & E-commerce - 15+ projects: multi-vendor products, Stripe, subscriptions, bidding, complex search.
🏠 PropTech / Real Estate -5+ projects: listings, booking flows, agent dashboards, rental platforms.
🤖 AI Startups - 25+ AI products/features: AI SaaS, chatbots, agents, copilots, OpenAI / Claude integrations.
💰 FinTech - 3+ projects: Stripe Connect, billing, payment flows, invoicing.
🎮 Gaming - 5+ projects, including 2 major global gaming brands: dashboards, analytics, real-time interactions.
📚 EdTech - 5+ projects: student dashboards, progress tracking, content platforms.
📣 MarTech - 1 global market-leading project: dashboards, analytics, segmentation, workflows.
⚽ SportsTech - 10+ projects: live data, dashboards, events, rankings, stats, mobile apps.
📌 How We Work
1️⃣ Discovery & technical planning
2️⃣ Engineer matching within 24h
3️⃣ 2-week trial period
4️⃣ Weekly demos and reports
5️⃣ CTO-approved delivery with code review and QA
6️⃣ Long-term support after launch
🚀 Building a SaaS, MVP, marketplace, React app, Next.js platform, React Native app, AI product, or mixed-stack web/mobile platform?
Click “Invite” or “Hire” - I’ll help you clear the estimate or discovery phase within 24 hours or less.
Steps for completing your project
After purchasing the project, send requirements so Yuliia can start the project.
Delivery time starts when Yuliia receives requirements from you.
Yuliia works on your project following the steps below.
Revisions may occur after the delivery date.
expert reviews the selected authentication flow and related materials.
The flow is checked for login logic, sessions, tokens, permissions, roles, and common security risks.
receive a short report with findings, priority, and recommended next steps.