⚡ FastAPI

Why FastAPI?

FastAPI has become my go-to framework for Python backends because it hits the sweet spot of performance, developer experience, and production readiness.

My FastAPI Architecture

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# Production FastAPI Structure
from fastapi import FastAPI, Depends, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from contextlib import asynccontextmanager

@asynccontextmanager
async def lifespan(app: FastAPI):
    # Startup: Initialize connections
    await database.connect()
    await redis.initialize()
    yield
    # Shutdown: Clean up
    await database.disconnect()
    await redis.close()

app = FastAPI(
    title="AI Backend Service",
    version="1.0.0",
    lifespan=lifespan
)

# Structured API with dependency injection
@app.post("/api/v1/generate", response_model=GenerationResponse)
async def generate(
    request: GenerationRequest,
    user: User = Depends(get_current_user),
    llm: LLMService = Depends(get_llm_service),
    db: AsyncSession = Depends(get_db)
):
    # Validate, process, and respond
    result = await llm.generate(request.prompt, user.context)
    await db.log_usage(user.id, result.tokens_used)
    return GenerationResponse(content=result.text, citations=result.sources)

Integrations I Build

• Databases: PostgreSQL (async), MongoDB, Redis
• Message Queues: Celery, RabbitMQ, Redis Streams
• AI/ML: LangChain, OpenAI, Anthropic, HuggingFace
• Cloud: AWS Lambda, GCP Cloud Run, Docker, Kubernetes
• Monitoring: Prometheus, Grafana, Sentry, OpenTelemetry

Frequently Asked Questions

How much does it cost to hire a FastAPI developer?

Hiring a FastAPI developer costs $100-180 per hour for senior expertise. For project-based work, simple APIs start at $8,000-15,000, while AI-integrated backends range from $30,000-100,000+. Rates vary by region: US developers charge $120-200/hour, European developers $80-150/hour. I offer competitive rates with senior-level expertise.

Where can I hire a FastAPI developer?

You can hire FastAPI developers through freelance platforms (Upwork, Toptal), agencies, or directly from independent consultants like myself. For production AI backends, I recommend hiring someone with proven LangChain/LLM experience, not just FastAPI syntax knowledge. Schedule a call at cal.com/nazmul.

FastAPI vs Django vs Flask: which should I use in 2025?

Choose FastAPI for: async APIs, AI/ML backends, high-performance microservices, automatic OpenAPI docs. Choose Django for: full-featured web apps, admin panels, rapid prototyping. Choose Flask for: simple services, maximum flexibility. FastAPI is the fastest-growing Python framework, especially for AI applications.

What is the hourly rate for FastAPI developers in the US?

FastAPI developer hourly rates in the US range from $100-200/hour depending on experience. Junior developers charge $50-80/hour, mid-level $80-120/hour, and senior developers with AI/ML expertise charge $120-200/hour. Effective rates start at $50/hour with prepaid packages. See pricing for details with 5+ years FastAPI production experience.

Is FastAPI good for production in 2025?

Yes. FastAPI is production-ready and powers major companies including Microsoft, Netflix, and Uber. It offers: native async for high concurrency, automatic validation with Pydantic, built-in OpenAPI documentation, and excellent performance benchmarks. I’ve deployed FastAPI backends serving millions of requests for companies like Anaqua and Flowrite.

Related

Experience:

• AI Backend Lead at Anaqua - Built AI backend with FastAPI
• Senior Engineer at Flowrite - LLM email assistant backend
• Founder at Sparrow Intelligence - Knowledge system APIs

Case Studies: Enterprise RAG System | LLM Orchestration

Pillar: Backend Engineering Services

Related Services: Python, LangChain, REST APIs, OpenAI Integration