Flask, created by Armin Ronacher in 2010, is a lightweight WSGI web application framework in Python. It is classified as a microframework because it does not require particular tools or libraries — no database abstraction layer, form validation, or other components where pre-existing third-party libraries provide common functions. Flask keeps the core simple but extensible, making it ideal for small to medium applications and microservices.
The Flask job market in India is strong, particularly in startups and data-centric companies. Per Glassdoor 2026, Flask Developers in Pune earn an average of ₹7 LPA, with the top 10% reaching ₹12 LPA. Per 6figr 2026, employees with Flask skills earn an average of ₹27.9 LPA (including senior data engineering roles). Per Naukri 2026, there are over 35,000 Python Flask job listings, with Accenture, TCS, and Infosys being top employers.
Flask's philosophy is 'start simple, scale up.' It provides routing, request handling, and templating out of the box, while extensions like Flask-SQLAlchemy, Flask-Login, and Flask-RESTful add functionality as needed. This makes Flask perfect for microservices, APIs, and prototypes. The framework is widely used in machine learning and data science projects to serve models as web APIs — bridging the gap between data science and web development.
For Pune learners, Flask is typically taught as a 1–2 month module within Python full-stack or backend courses. It is an excellent entry point into Python web development before progressing to Django. Flask skills are particularly valued in startups, AI/ML companies, and organizations building microservices architectures. Understanding how to build REST APIs with Flask and deploy them with Docker is essential for backend interviews.