Latest Questions 209 total
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121What are the most common coding interview mistakes and how can you avoid them?
I'm preparing for software developer interviews and want to know the common mistakes candidates make during coding rounds. Apart from writin...
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122What is underfitting in machine learning and how can you prevent it?
I'm learning machine learning and often come across the term underfitting when training models. I understand it happens when a model doesn't...
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123What are HTTP status codes every developer should know?
I'm learning web development and often see HTTP status codes like 200, 201, 301, 400, 401, 403, 404, and 500 when working with APIs and web ...
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124What is password hashing and why should developers use bcrypt?
I'm learning about user authentication and password security. Many tutorials recommend using bcrypt instead of storing plain-text passwords ...
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125What is MCP (Model Context Protocol) and why is it becoming important for AI applications?
I've been hearing about the Model Context Protocol (MCP) in discussions around AI agents and LLMs. How does MCP work, what problems does it ...
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126What is the difference between a product company and a service company for developers?
**Service Company (IT Services / Outsourcing):**
TCS, Infosys, Wipro, HCL, Cognizant
- You work on clients' projects
- Technology stack deci...
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127How to answer 'Tell me about yourself' in a tech interview?
This is always the first question — most candidates waste it. Here's the formula:
**Structure: Present → Past → Future**
*Present:* ...
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128What is the difference between OpenAI GPT-4o and GPT-4o-mini?
Both are OpenAI models but optimised for different use cases:
| Feature | GPT-4o | GPT-4o-mini |
|---|---|---|
| Intelligence | Highest | G...
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129What are LangChain agents and how do they differ from chains?
**LangChain Chains:**
- Fixed, predefined sequence of steps
- The flow is hardcoded by the developer
- Deterministic — same input → same...
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130What is a vector database and why is it used in AI applications?
A vector database stores data as high-dimensional vectors (embeddings) and enables fast similarity search.
**Why it's needed:**
LLMs unders...
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131How does garbage collection work in Python?
Python uses two mechanisms for memory management:
**1. Reference Counting (primary):**
Every object has a reference count. When it reaches ...
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132What are Python generators and when should you use them?
A generator is a function that yields values one at a time instead of returning them all at once — saving memory.
**Regular function vs G...
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133What is the difference between multiprocessing and multithreading in Python?
Due to Python's GIL (Global Interpreter Lock), threads can't run Python code in parallel — only one thread executes at a time.
**Multithr...
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134How to prepare for a Java developer interview?
Java interviews at product companies cover 4 areas. Here's exactly what to prepare:
**1. Core Java (always asked):**
- OOPs: inheritance, p...
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135What skills are needed to become a DevOps engineer in 2025?
DevOps engineer is one of the highest-paying roles in tech. Here's the complete skill map:
**Foundation (must-have):**
- Linux command line...
