Django / Flask / FastAPI

Python web frameworks: build APIs, web apps, admin panels

⬢ স্তর 2প্রযুক্তিগত

উচ্চ

বেতনের প্রভাব

5 মাস

শেখার সময়

মাঝারি

কঠিনতা

ক্যারিয়ার

এক নজরে

Django (60k+ active projects), Flask (minimal, 100k+ repos), and FastAPI (rising async standard, 2024+) are Python's three dominant web frameworks. Django dominates traditional web apps (admin panels, ORM, auth built-in, $110-165k); Flask powers microservices and light APIs ($100-145k); FastAPI is the 2026 default for new REST APIs and data services, native async/await, auto OpenAPI docs ($105-155k). Learning path: Flask basics (2mo) → Django or FastAPI (2-4mo) → async patterns & deployment. Salary span: +$25-55k over base Python. Jobs: Backend Engineer L2+, DevOps, Data API teams.

Django / Flask / FastAPI কী

Django, Flask, and FastAPI are Python's three dominant web frameworks, each serving a distinct niche. Django is the batteries-included monolith: ORM, admin panel, auth, and migrations built-in, best for traditional web apps and content sites. Flask is the minimalist framework: route decorators, no ORM by default, perfect for microservices and lightweight APIs. FastAPI is the modern async standard: native async/await, automatic OpenAPI documentation, Pydantic validation, and the framework of choice for new REST APIs and data services. All three run on WSGI (Django/Flask) or ASGI (FastAPI), deploy via Gunicorn/Uvicorn/Hypercorn, and integrate with SQLAlchemy, PostgreSQL, and Redis. In 2026, FastAPI is ascendant for greenfield projects; Django retains strongholds in traditional web development and enterprise; Flask powers thousands of microservices started in the 2010s and still running.

🔧 সরঞ্জাম এবং ইকোসিস্টেম

DjangoFlaskFastAPIPyramidStarletteDjango REST FrameworkTortoise ORMSQLAlchemyAlembicPydanticUvicornGunicornHypercornCelery

📋 শুরু করার আগে

Python Backend Development

💰 অঞ্চল অনুযায়ী বেতন

অঞ্চল	জুনিয়র	মধ্য	সিনিয়র
USA	$105k	$140k	$185k
UK	£60k	£80k	£115k
EU	€65k	€85k	€125k
CANADA	C$110k	C$145k	C$190k

🎓 সার্টিফিকেশন

Django for Professionals (William Vincent)Real Python Courses: Django & FastAPI TestDriven.io FastAPI Course Django Software Foundation Training

🎯 Django / Flask / FastAPI ব্যবহার করে এমন ক্যারিয়ার

Machine Learning Engineer

⚖ এর সাথে তুলনা করুন

Backend Development Apis Rest Design

❓ প্রায়শই জিজ্ঞাসিত প্রশ্ন

FastAPI vs Django in 2026, which should I pick for my startup?

New API projects: FastAPI. Greenfield full-stack (templates+auth+admin): Django. Microservices: Flask or Starlette. FastAPI wins on speed (async by default, auto OpenAPI), developer experience (Pydantic validation), and hiring ease (cleaner syntax). Django wins on ecosystem maturity (ORM, admin, migrations battle-tested), team familiarity (larger job market), and all-in-one deployment. If async is your main concern: FastAPI. If you need admin panel + migrations: Django. Mixed: FastAPI for APIs, Django for backend-of-backends.

ORM choice: Django ORM vs SQLAlchemy vs Tortoise ORM, which is best?

Django ORM: coupled to Django, excellent for query optimization and admin integration, weak on complex joins. SQLAlchemy: decoupled, most powerful, steep learning curve, industry standard for non-web Python. Tortoise ORM: async-native, lightweight, smaller ecosystem, ideal for FastAPI apps. For FastAPI: Tortoise + Pydantic. For Django: stick with Django ORM. For microservices: SQLAlchemy Core. In interviews: knowing SQLAlchemy = portable across frameworks.

Async vs sync in 2026: when do I actually need async?

Sync (Django, Flask): fine for <1000 concurrent users, I/O-heavy (DB, APIs), simple request→response. Async (FastAPI/Starlette): required for 10k+ WebSocket connections, real-time data feeds, high-concurrency APIs, ML inference endpoints. Don't use async for CPU-bound work (use processes/Celery). Most startups start sync, scale to async only when profiling shows I/O bottleneck. FastAPI's advantage: async ready from day one, no refactor later.

Deploying Python web apps in 2026: Docker vs Vercel vs Railway vs self-hosted?

Docker is standard (Gunicorn/Uvicorn + nginx). Vercel: Next.js only. Railway/Render: easy deploys, pay-per-second, good for side projects ($5-30/mo typical). AWS (Fargate/Lambda): enterprise, complex setup, cheapest at scale. Digital Ocean/Heroku: middle ground. Django: Gunicorn + systemd on cheap VPS or managed platforms (PythonAnywhere). FastAPI: Uvicorn on Railway/Render fastest to ship. Most 2026 startups: Railway or self-hosted VPS ($5-15/mo) with Docker.

FastAPI interview prep: what do they always ask?

1. Async/await and when you'd use `await`. 2. Dependency injection (Depends() pattern). 3. Middleware order (executes top-down, response bottom-up). 4. Pydantic validation and custom validators. 5. JWT vs session auth (FastAPI has no built-in sessions). 6. Testing with TestClient. 7. Background tasks vs Celery. 8. Performance: FastAPI is fast because of Pydantic + Starlette, not magical. Prepare examples: write a CRUD endpoint with Pydantic models, describe async benefits, justify auth choice.

Django vs Mojo (Python's 'replacement'): should I worry in 2026?

Mojo is 1% of the market in 2026. Django runs on CPython, not Mojo. Learning Django/FastAPI today is zero risk, both will be job-relevant for 5+ years. Mojo's killer feature (100x speedups) only kicks in for compute-heavy code, not web. If worried: Rust + Pyo3 for CPU-bound parts, Python for everything else. Django and FastAPI are here to stay.