You will get I'll build you a REST API backend with NestJS + PostgreSQL
Project details
I build clean, production-ready REST API backends using NestJS and
PostgreSQL — the same stack powering enterprise SaaS systems at scale.
What you get is not just working code. It's modular architecture, proper
error handling, input validation, JWT authentication, and role-based access
control — built the way a senior engineer would build it, not hacked
together to pass tests.
I'm currently building a multi-tenant SaaS CRM on 22 NestJS microservices
with AI integrations and full observability. I bring that same level of
thinking to every project, no matter the size.
If you need a backend that works today AND scales tomorrow, let's talk.
PostgreSQL — the same stack powering enterprise SaaS systems at scale.
What you get is not just working code. It's modular architecture, proper
error handling, input validation, JWT authentication, and role-based access
control — built the way a senior engineer would build it, not hacked
together to pass tests.
I'm currently building a multi-tenant SaaS CRM on 22 NestJS microservices
with AI integrations and full observability. I bring that same level of
thinking to every project, no matter the size.
If you need a backend that works today AND scales tomorrow, let's talk.
Programming Languages
JavaScript, TypeScriptCoding Expertise
Performance Optimization, Security, DesignWhat's included
| Service Tiers |
Starter
$100
|
Standard
$200
|
Advanced
$350
|
|---|---|---|---|
| Delivery Time | 4 days | 6 days | 10 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Frequently asked questions
About Mohamed Aziz
Full Stack & Mobile Engineer | NestJS, React, Flutter, AI Integration
Sousse, Tunisia - 9:38 pm local time
Currently finishing a multi-tenant SaaS CRM built on ~22 NestJS microservices with two-layer AI email intelligence, strict RBAC, and observability via Langfuse + Sentry + PostHog. That's the level of system I design and ship.
What I can build for you:
✅ SaaS backends and REST APIs (NestJS, Node.js, PostgreSQL, Redis)
✅ React and Next.js web frontends — dashboards, admin panels, CRMs
✅ Cross-platform mobile apps with Flutter (iOS + Android from one codebase)
✅ AI integrations — LLM pipelines, email intelligence, RAG, OpenAI/Anthropic API
✅ Multi-tenant architecture with role-based access control
✅ Docker, CI/CD, Cloudflare, self-hosted infra setup
✅ MVP development for startups — from architecture to deployment
My stack:
Backend: NestJS · Node.js · MongoDB · PostgreSQL · Redis · Docker
Frontend: React · Next.js · TypeScript · Tailwind
Mobile: Flutter · Dart
AI: OpenAI API · Anthropic API · Langfuse · LangChain
DevOps: Docker · GitHub Actions · Cloudflare Tunnels · Linux
I write clean, documented, scalable code — not just code that works today. I communicate clearly, hit deadlines, and flag problems early instead of at the last minute.
New to Upwork, not new to building. My work is in production.
Let's talk about what you need — message me and I'll tell you in 24 hours if I'm the right fit and roughly what it'll take.
Steps for completing your project
After purchasing the project, send requirements so Mohamed Aziz can start the project.
Delivery time starts when Mohamed Aziz receives requirements from you.
Mohamed Aziz works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements & architecture
Review your requirements, define the data models, API endpoints, and project structure. Share a brief spec for your approval before coding starts.
Development
Build the API with all agreed endpoints, authentication, validation, and error handling. Share progress updates as each module is completed.