Role: Back-End Developer
College: Not Specified
Interview Date: Not Specified
Interview Type: Full-Time
Result: Not Specified
Difficulty: Hard
Rounds: Not Specified (Comprehensive Technical Interview)
Topics Asked: Personal Background, Python and Algorithms, Django Fundamentals, Database Design and Transactions, System Design and Data Modeling
Experience:
This experience outlines a comprehensive set of questions faced in a NxtWave interview for a Back-End Developer role, providing insights into the depth of technical knowledge expected.
Personal Background and Team Context:
- Tell me something about yourself.
- What is the application you are building in your current role? Describe the problem it solves and the users it serves.
- How are you integrating your team's workflow with Jira in day-to-day development?
Python and Algorithms:
- LeetCode: Two Sum. State the problem and discuss possible approaches at a high level. No solution code was required.
Django Fundamentals:
- Explain the Django request and response lifecycle end to end.
- Authentication versus Authorization in Django: define and contrast.
- What is token-based authentication in Django, and where would you use it?
- What is lazy loading in the database or ORM context, and when is it helpful or harmful?
- How do you model a many-to-many relationship between Django tables?
- How would you execute a heavy or long-running operation in a Django application?
- What is Celery, and what are its common use cases with Django?
- How do Django ORM joins work under the hood, and how do you write them cleanly?
Database Design and Transactions:
- What are ACID properties in databases?
- What is atomicity, and why does it matter in transactional systems?
- What is indexing in a database, and when should you add an index?
- How does indexing work internally at a high level?
- How is indexing different from GROUP BY, both in purpose and in execution plans?
System Design and Data Modeling:
- Design a table diagram for a minimal e-commerce application. Identify core entities, keys, and relationships.
- In that e-commerce design, what types of relationships are maintained between entities? One-to-one, one-to-many, many-to-many, and where.
- Explain the end-to-end deployment process for a production web application. Which machines and services do you need? Consider EC2, S3, databases, load balancers, networking, and observability.
- How would you improve API latency in a real service under load? Think end to end: network, app, database, caching, and deployment.
- How do you integrate Jira with your development and release pipeline?