You will get a production-ready FastAPI backend for your AI SaaS MVP
Project details
I will build a reliable backend foundation for your AI SaaS product using FastAPI, Node.js, or both. This project is best for startups that already have an idea, prototype, frontend, or product plan, but need a backend engineer to design APIs, connect AI providers, implement authentication, integrate payments, create database models, and prepare the system for real users.
I can help with OpenAI or Gemini integration, protected API routes, Stripe billing, webhooks, database schema design, deployment-ready structure, error handling, logging, and clean backend architecture.
This is a backend-first service. I can also support frontend integration when needed, especially for Next.js, React, and SaaS dashboard flows.
I can help with OpenAI or Gemini integration, protected API routes, Stripe billing, webhooks, database schema design, deployment-ready structure, error handling, logging, and clean backend architecture.
This is a backend-first service. I can also support frontend integration when needed, especially for Next.js, React, and SaaS dashboard flows.
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Localization, Performance Optimization, DesignWhat's included
| Service Tiers |
Starter
$500
|
Standard
$1,200
|
Advanced
$2,500
|
|---|---|---|---|
| Delivery Time | 5 days | 10 days | 21 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Frequently asked questions
About Nguyen Quang
Python Backend Engineer | FastAPI, AI/LLM APIs, Stripe, SaaS
Ho Chi Minh City, Vietnam - 5:56 pm local time
I specialize in backend-heavy SaaS work where reliability, billing correctness, authentication, API integration, and production behavior matter.
Core services:
• FastAPI backend development
• OpenAI / Gemini / LLM API integration
• Stripe Checkout, subscriptions, Customer Portal, and webhooks
• Firebase Auth, JWT, protected API routes, and tenant-scoped access
• Third-party API integrations and automation workflows
• PostgreSQL, SQLAlchemy, Docker, Google Cloud Run, CI/CD, logs, and error handling
Steps for completing your project
After purchasing the project, send requirements so Nguyen Quang can start the project.
Delivery time starts when Nguyen Quang receives requirements from you.
Nguyen Quang works on your project following the steps below.
Revisions may occur after the delivery date.
Create requirements
Review requirements, product workflow, existing codebase, and technical goals.
Design the structure
Design the backend structure, database models, API routes, and integration plan.