Answer core Python, CS, DB, and testing questions
Quick Overview
This multi-part prompt evaluates core software engineering competencies including Python fundamentals (OOP, object/model behavior, iterators/generators, decorators, serialization), data structures and algorithms (lists, trees, sorting and complexity), databases and web/OS concepts (indexes, B+ trees, ACID, joins, process vs thread, page-load flow), and testing/QA risk analysis for modules like data connections, user management and payment flows. It is commonly asked within the Software Engineering Fundamentals domain to measure both conceptual understanding and practical application, emphasizing trade-off reasoning, system-level thinking and testability awareness rather than implementation details.
Fundamentals (Python / CS / DB / OS / Web / Testing)
Answer the following interview prompts. Keep answers precise, with examples and tradeoffs.
A) Testing & QA
- In a project that includes data connection management , user management , and permission management , what are the main testing risk areas for each module?
- Scenario: WeChat scan-to-pay (QR code payment). How would you design test cases ?
B) Python fundamentals
- What are the three most basic characteristics of object-oriented programming ?
- What are shallow copy and deep copy ?
- Differences between list and tuple ?
- Key characteristics of a dict ?
- What is a decorator and why use it?
-
Difference between
__init__and__new__? - What is a generator ?
- What is an iterator used for?
-
What is
self? - What is serialization/deserialization ?
- Can Python have memory leaks ? How to avoid them?
C) Data structures & algorithms (conceptual)
- What is a linked list ?
- What sorting algorithms do you know? Which is “fast”?
- Why is quicksort’s average time complexity ?
- What are the characteristics of stack and queue ? When to use each?
- What is a binary tree ? What traversal orders exist?
- What is a red-black tree ?
D) Database & web/OS
- What is a database index ?
- Why can indexes speed up queries?
- What is a B+ tree (why used for indexes)?
- What is ACID in transactions?
- What types of JOIN exist?
- When a phone opens a webpage and content loads, what key technical steps happen?
- Concepts of process vs thread ; key differences?