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$
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I will build scalable python fastapi backend with postgresql mongodb docker
Qamar Ul Islam
About this gig
Need a truly async, high-throughput Python backend that won't freeze under heavy load?
Many developers use blocking DB drivers inside async FastAPI routes, locking the event loop. I build production-grade FastAPI apps engineered for non-blocking async performance, clean Pydantic v2 typing, and resilient databases.
50+ projects | 4.8 | SaaS MVPs, data pipelines & AI products.
️ The Modern FastAPI Stack:
FastAPI (Python 3.12) + Pydantic v2 validation
PostgreSQL with async SQLAlchemy 2.0 (asyncpg) + Alembic
MongoDB with Beanie ODM (typed async documents)
Redis caching & rate limiting
Celery / ARQ workers for emails, webhooks & queues
OAuth2 + JWT (Access & Refresh), bcrypt, RBAC
Stripe webhooks, REST APIs, OpenAI/Claude/Gemini
Multi-stage Dockerfile + docker-compose
Every Order Includes:
Clean, modular async Python codebase
Swagger UI + ReDoc docs
Zero-downtime Alembic migrations
Pytest + HTTPX test suite
Multi-container Docker for 1-click VPS deploy
Send me your specs and let's build your FastAPI backend right!
Get to know Qamar Ul Islam
Qamar Ul Islam
Senior Backend and AI Systems Engineer: Go, Python, Nextjs
- FromPakistan
- Member sinceMay 2023
- Avg. response time4 hours
- Last delivery9 months
Languages
Urdu, English
Hi, I'm Qamar! 👋
Senior Backend & Applied AI Engineer with 50+ completed orders & 4.8★ rating on Fiverr.
🚀 Core Expertise:
• AI & RAG Systems: Custom Pinecone/LangChain chatbots, MCP servers, and LLM integrations
• High-Performance Backends: Scalable Go (Golang), Python (FastAPI), and NestJS APIs
• Databases & Cloud: PostgreSQL, MongoDB, Redis, Docker, and multi-tenant architectures
• Full-Stack Web: Next.js, React, Stripe billing, and modern SaaS solutions
Clean code, fast delivery, and clear communication. Let's build your vision! 📩
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FAQ
How do you ensure the backend is truly asynchronous?
I use dedicated async drivers — asyncpg for PostgreSQL and Motor/Beanie for MongoDB. This guarantees zero event-loop blocking during I/O, so FastAPI handles thousands of concurrent requests smoothly.
How do you handle database migrations?
For PostgreSQL, I configure Alembic migration scripts so you can upgrade or downgrade your schema safely in production without data loss
Can you add background workers for long-running tasks?
Yes. In the Premium package I set up Celery or ARQ with Redis so emails, scrapers, exports, and AI calls run asynchronously without slowing API responses.
Can you integrate Stripe and third-party APIs?
Yes. I have extensive experience with Stripe (subscriptions, webhooks, payment intents) and secure OAuth 2.0 flows with third-party platforms.
Can you integrate AI / LLM models?
Yes. I integrate OpenAI, Anthropic Claude, and Google Gemini with streaming SSE responses for chatbots, vector embeddings, and RAG pipelines.
