You will get FastAPI backend fixes, API refactoring, and third-party integrations
Project details
I will help you fix, improve, or integrate backend systems for SaaS, eCommerce, internal tools, automation platforms, and API-heavy applications.
This project is best if your backend has broken integrations, unreliable API flows, webhook issues, slow database queries, unclear architecture, environment problems, or production bugs that need careful investigation and a practical fix.
I can help with REST or GraphQL APIs, third-party API integrations, webhook debugging, backend refactoring, database query optimization, error handling, logging, deployment configuration, and production-readiness improvements.
My focus is safe, targeted backend work: understand the issue, identify the root cause, fix the right workflow, and avoid unnecessary rewrites.
This project is best if your backend has broken integrations, unreliable API flows, webhook issues, slow database queries, unclear architecture, environment problems, or production bugs that need careful investigation and a practical fix.
I can help with REST or GraphQL APIs, third-party API integrations, webhook debugging, backend refactoring, database query optimization, error handling, logging, deployment configuration, and production-readiness improvements.
My focus is safe, targeted backend work: understand the issue, identify the root cause, fix the right workflow, and avoid unnecessary rewrites.
Programming Languages
JavaScript, Python, TypeScriptWhat's included
| Service Tiers |
Starter
$250
|
Standard
$700
|
Advanced
$1,500
|
|---|---|---|---|
| Delivery Time | 2 days | 7 days | 14 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Fast delivery
(+ 1 Day)
+$200
Additional API workflow
(+ 3 Days)
+$300
Test coverage
(+ 2 Days)
+$250Frequently asked questions
About Nguyen Quang
Python Backend Engineer | FastAPI, AI/LLM APIs, Stripe, SaaS
Ho Chi Minh City, Vietnam - 5:12 am 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.
Review
Review the issue, codebase, logs, API documentation, and expected behavior.
Reproduce
Reproduce or trace the problem and identify the likely root cause.