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$
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I will architect a secure nestjs backend with rbac and sso authentication
Saad Ur Rehman
About this gig
Enterprise-Grade NestJS & Node.js Backend Development
I don't just write CRUD endpoints I architect backend systems the way enterprise platforms need to be built: secure, scalable, and maintainable from day one.
I recently built the complete backend for an enterprise collaboration platform combining social networking, document management, scheduling, and internal operations. That required real RBAC authorization, SSO authentication, live real-time features, and integrations with half a dozen third-party services not just basic REST endpoints.
Why work with me
Most "backend developers" here can build a CRUD API. Very few can design a system that stays clean, secure, and fast once it has real users, real data, and real permission rules. I specialize in that gap.
What I bring
- NestJS, Node.js, TypeScript, PostgreSQL
- RBAC & fine-grained permissions
- SSO / OAuth2 (Google, Outlook, custom)
- JWT auth with refresh tokens
- Real-time via Socket.IO
- Elasticsearch search
- AWS (S3, SNS, CloudFront)
- Firebase push notifications
- Calendar sync (Google/Outlook)
- Swagger/API documentation
Have a complex or custom project? Message me first so I can scope it accurately.
Get to know Saad Ur Rehman
Saad Ur Rehman
AI Solutions, Node js Backend Engineer
- FromPakistan
- Member sinceNov 2022
- Avg. response time1 hour
Languages
Urdu, English, Dutch
I build AI-powered automation systems and scalable backend solutions that help businesses operate 24/7. I'm Saad, an AI Engineer & Enterprise Backend Developer with 2+ years of experience in n8n, Make, NestJS, Node.js, Python, PostgreSQL, MCP, GPT-4o, Gemini, Whisper, and Groq/Llama. I develop AI agents, backend APIs, workflow automation, RAG applications, lead generation systems, customer support, appointment booking, and enterprise software with secure, production-ready architecture.
My Portfolio
FAQ
Do I get the full source code?
Yes. Every package includes complete, unrestricted access to the source code and repository. There are no hidden or withheld files.
Can you work with my existing codebase instead of starting from scratch?
Yes. I regularly audit, extend, and refactor existing NestJS/Node.js projects. Please share your repo or a description of the current setup before ordering so I can scope it accurately.
Do you handle deployment and hosting setup?
I can set up CI/CD pipelines and provide deployment guidance for platforms like AWS, Railway, Render, or DigitalOcean. Hosting and infrastructure costs are the client's responsibility.
What database do you work with?
PostgreSQL is my primary database, but I also work with MySQL and MongoDB depending on project needs. Let me know your preference before ordering.
Will you provide API documentation?
Yes. All packages include Swagger documentation. Standard and Premium also include detailed code comments throughout the codebase.
My project doesn't fit any of the listed packages, what should I do?
Message me first with your requirements. I'll scope a custom offer so you're only paying for what you actually need.
Do you sign an NDA?
Yes, I'm happy to sign an NDA before we discuss any project details.
How do revisions work?
Each package includes a set number of revisions covering bugs or adjustments within the original scope. Changes outside the original scope are treated as additional work and quoted separately.
Can you integrate authentication with our existing user system (Auth0, Firebase Auth, Cognito, etc.)?
Yes. I can integrate with an existing auth provider or build authentication from scratch, whichever fits your architectu
Do you write tests?
Unit and integration tests are available on request and included by default in the Premium package. Let me know if you need test coverage for Basic or Standard.
