Engineering · Rapidly Growing
Python Developer: Skills, Projects & Interview Questions (2026)
Build backend services, automation, and data pipelines in Python that power web apps, APIs, and AI systems.
What a Python Developer actually does
Writing APIs and services, fixing bugs, adding tests, and reviewing pull requests with the team.
Top hiring companies: Google, Amazon, Swiggy, Razorpay, Zerodha, Flipkart.
Top industries: Tech / SaaS, Fintech, E-commerce, Data / AI, Startups.
Skills you need to become a Python Developer
| Skill | Importance | Learning hours | Interview weight |
|---|---|---|---|
| Python Core | 10/10 | ~60h | High |
| Data Structures & Algorithms | 9/10 | ~80h | High |
| FastAPI / Django / Flask | 9/10 | ~60h | High |
| SQL & Databases | 9/10 | ~40h | High |
| REST API Design | 8/10 | ~30h | High |
| Git & Version Control | 8/10 | ~20h | Medium |
| Testing (pytest) | 8/10 | ~30h | Medium |
| Async & Concurrency | 7/10 | ~30h | Medium |
| Docker & Deployment | 7/10 | ~30h | Medium |
| ORM (SQLAlchemy / Django ORM) | 7/10 | ~30h | Medium |
| Problem Solving | 8/10 | ~20h | High |
Core tools: VS Code / PyCharm, Git & GitHub, PostgreSQL, Docker, Postman, pytest, Redis.
Python Developer learning roadmap
Beginner · 2-3 months
Foundations & core tooling
Build: Build a CLI app and a public-API script covering core Python, files, and functions.
Intermediate · 3-4 months
Applied, real-world builds
Build: Build a REST API with FastAPI/Django, PostgreSQL, auth, and tests.
Advanced · 3-4 months
Production, scale & specialization
Build: Ship a Dockerized microservice with async workers, CI/CD, and monitoring.
9 Python Developer portfolio projects
CLI To-Do Manager
BeginnerBuild a command-line task manager with file persistence and argparse.
Skills: Python Core, File I/O, CLI
Weather CLI with Public API
BeginnerFetch and display weather using a public REST API and requests.
Skills: Python Core, REST API, requests
Web Scraper + CSV Export
BeginnerScrape a site with BeautifulSoup and export clean data to CSV.
Skills: Python Core, Web Scraping, Data Cleaning
REST API for a Blog (FastAPI)
IntermediateCRUD API with FastAPI, PostgreSQL, and JWT auth.
Skills: FastAPI, SQL, REST API Design
URL Shortener Service
IntermediateShorten URLs with a database, redirect, and click analytics.
Skills: FastAPI, SQL, Redis
Django E-commerce Backend
IntermediateProduct catalog, cart, and orders with Django ORM and admin.
Skills: Django, SQL, ORM
Async Job Queue Worker
IntermediateBackground task processor using Celery/RQ and Redis.
Skills: Async & Concurrency, Redis, Python Core
Dockerized Microservice + CI
AdvancedContainerize a service with tests and a GitHub Actions pipeline.
Skills: Docker, Testing, FastAPI
Real-time Chat with WebSockets
AdvancedMulti-room chat using FastAPI WebSockets and Redis pub/sub.
Skills: Async & Concurrency, FastAPI, Redis
Common Python Developer interview questions
What is the difference between a list and a tuple?Easy
What they're testing: Lists are mutable; tuples are immutable and hashable
Explain the Global Interpreter Lock (GIL).Medium
What they're testing: One thread runs Python bytecode at a time; use multiprocessing for CPU work
How do decorators work in Python?Medium
What they're testing: A function that wraps another to add behavior; returns a callable
Difference between deepcopy and shallow copy.Medium
What they're testing: Nested references copied vs shared
What are generators and why use them?Medium
What they're testing: Lazy iterators with yield; memory-efficient for large streams
How does exception handling work? try/except/finally.Easy
What they're testing: Catch specific exceptions; finally always runs
Explain *args and **kwargs.Easy
What they're testing: Positional and keyword variadic arguments
How do you optimize a slow API endpoint?Hard
What they're testing: Profile, add indexes, cache, reduce N+1 queries, async I/O
What is the difference between async and threading?Hard
What they're testing: Async is cooperative single-thread I/O; threads are OS-scheduled
How do you prevent SQL injection?Medium
What they're testing: Parameterized queries / ORM, never string-concatenate input
Reverse a linked list.Medium
What they're testing: Iterate swapping next pointers with prev tracking
Find duplicates in a list efficiently.Easy
What they're testing: Use a set for O(n) membership tracking
Certifications for Python Developers
- PCEP – Certified Entry-Level Python ProgrammerPython Institute · High value
- PCAP – Certified Associate in Python ProgrammingPython Institute · High value
- AWS Certified Developer – AssociateAmazon Web Services · Very High value
- Microsoft Certified: Azure Developer Associate (AZ-204)Microsoft · High value
Python Developer career path
Python Developer -> Senior Python Developer -> Backend / Tech Lead -> Engineering Manager / Architect
Common moves into this role / from here:
- → Data Engineer (6-9 months) — close: Spark/PySpark, ETL/ELT, data warehousing, Airflow, cloud data platforms
- → Machine Learning Engineer (6-12 months) — close: ML algorithms, NumPy/Pandas depth, model training, MLOps, deployment
- → Backend Developer (3-6 months) — close: System design, message queues, caching, microservices, observability
- → DevOps Engineer (6-9 months) — close: Kubernetes, Terraform, CI/CD pipelines, cloud infra, monitoring
Related roles: Backend Developer, Django Developer, Data Engineer, Machine Learning Engineer
Frequently asked questions
What skills do you need to become a Python Developer?
Core skills include Python Core, Data Structures & Algorithms, FastAPI / Django / Flask, SQL & Databases, REST API Design. Always work inside a virtual environment and write tests as you go, not after.
What projects should a Python Developer build for a portfolio?
Strong starter projects: CLI To-Do Manager; Weather CLI with Public API; Web Scraper + CSV Export; REST API for a Blog (FastAPI).
How long does it take to become job-ready as a Python Developer?
A focused plan runs roughly 2-3 months for fundamentals, then applied projects. Difficulty rating: 4/10.
What is the career path for a Python Developer?
Python Developer -> Senior Python Developer -> Backend / Tech Lead -> Engineering Manager / Architect
Ready to become a Python Developer?
PrepNPlaced turns this guide into action — a day-by-day roadmap, ATS-ready resume, and real interview practice.
Start free →