What recruiters should know
Flask leads all Python web frameworks in raw downloads with approximately 40 million monthly downloads on PyPI (pynions 2026). It remains widely used for simple APIs, ML model serving, and microservices. FastAPI has surpassed Flask in developer satisfaction for new projects due to async support and auto-generated OpenAPI docs. However, Flask's simplicity and massive existing codebase ensure continued demand — especially in data science/ML contexts where a quick API wrapper around a model is required.
In plain terms
Lightweight Python web framework for building web applications and APIs
Industry demand
Overall level
high
Trend
stable
Top hiring sectors
- ML Model Serving
- Data Science APIs
- SaaS Microservices
- Research & Academia
- Internal Tools
Proficiency ladder
What each level looks like in the work — behavioural markers, not job titles.
At this level, a developer can…
- Routes
- Templates
- Forms
- Basic app structure