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Fiverr Pro
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$
USD
I will build a complete authentication system with otp firebase clerk or jwt
Anuj Singh
About this gig
A poorly built auth system is a security risk I build it right the first time. From email/password login to OTP, Firebase, Clerk, and full RBAC, I've shipped this in production, including auth for a real-time platform load-tested for 1,000 concurrent users.
WHAT I BUILD
- Email/password login with JWT, protected routes, refresh tokens (Basic+)
- OTP login, Firebase Auth, password reset, email verification (Standard+)
- Google OAuth, role-based access control, Clerk integration (Standard+)
- MFA, custom admin panel, session management, audit logs (Premium only)
TECH STACK
Next.js, React, TypeScript, Node.js, Express, NestJS, Clerk, Firebase, Passport.js, NextAuth, MongoDB, PostgreSQL, Twilio
SECURITY
Bcrypt password hashing, JWTs in httpOnly cookies (never localStorage), rate-limiting against brute-force attempts.
Message me before ordering with your stack and preferred auth method I'll confirm the right package and timeline.
Get to know Anuj Singh
Anuj Singh
Modern fullstack website and web app development
- FromIndia
- Member sinceJul 2025
- Avg. response time1 hour
- Last delivery3 weeks
Languages
Hindi, English
Hi, I’m Anuj, a full-stack web developer specializing in building modern, responsive, and user-friendly websites and web applications. I work with React.js, Next.js, TypeScript, Tailwind CSS, Node.js, MongoDB, and Firebase to deliver reliable and scalable solutions.
I handle both frontend and backend development, focusing on clean UI, smooth user experience, and well-structured code.
Some of my strengths are problem-solving, clean UI/UX design, real-time functionality using WebSockets, and API integration. I take pride in writing scalable, efficient code and bringing creative ideas to life.
My Portfolio
Other Software Development Services I Offer
FAQ
Which auth method should I use — Clerk, Firebase, or custom JWT?
Clerk is best for Next.js projects where you want a fully managed solution with a beautiful UI and minimal setup. Firebase Auth is great for projects already using Firebase. Custom JWT gives you full control and works with any backend — best for complex role systems or when you want zero vendor depe
Can you add authentication to my existing application?
Yes — this is one of the most common requests I get. Share your current tech stack and I will integrate the auth system cleanly without breaking your existing code. I write modular auth middleware that plugs into your routes without restructuring your whole project.
Is the authentication secure enough for a production app?
Yes. Every system I build follows current security best practices — bcrypt password hashing, httpOnly cookie JWT storage, rate limiting on sensitive endpoints, input validation, and CORS configuration. I have built auth for production SaaS products, not just demo projects.
How is the code delivered?
You receive a GitHub repository with a clean folder structure, env variable setup instructions, and full documentation of every auth flow. You own the code completely.
Do you offer OAuth or MFA? Which tier?
Google OAuth is included from Standard up; MFA and audit logs are Premium-only.
