Full Stack Questions 18 total
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1What is the salary of a full stack developer in India 2025?
Full stack developer salaries in India (2025):
**By experience:**
- Fresher (0-1 year): ₹3.5 – ₹7 LPA
- Junior (1-3 years): ₹7 – ...
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2How do you handle authentication in a MERN stack app?
The standard approach uses JWT (JSON Web Tokens):
**Flow:**
1. User logs in → sends email + password to Express
2. Express validates cred...
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3What is the MERN stack and how does it work together?
MERN is a full-stack JavaScript framework combining 4 technologies:
**M — MongoDB:** NoSQL database (stores data as JSON documents)
**E �...
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4How does Docker networking work?
Docker networking allows containers to communicate with each other and the outside world.
**Default network types:**
1. **bridge** (defaul...
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5What is the difference between Git merge and Git rebase?
Both combine branches but in different ways:
**Git Merge:**
- Creates a new merge commit
- Preserves complete history with all branches vis...
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6What is Kubernetes and why is it used?
Kubernetes (K8s) is an open-source container orchestration platform that automates deployment, scaling, and management of containerised appl...
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7What is CI/CD and how does it work?
CI/CD stands for Continuous Integration and Continuous Delivery/Deployment.
**Continuous Integration (CI):**
- Developers push code frequen...
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8What is Spring Boot and why is it used for backend development?
Spring Boot is a framework that makes it easy to create production-ready Java applications with minimal configuration.
**Why Spring Boot ov...
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9What is the OWASP Top 10 and why does every developer need to know it?
OWASP Top 10 is the list of the 10 most critical web application security risks, updated every few years.
**2021 OWASP Top 10:**
1. Broken ...
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10What is SQL injection and how do you prevent it?
SQL injection is an attack where malicious SQL code is inserted into an input field to manipulate the database.
**Example attack:**
```
Use...
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11What is Azure DevOps and how is it used?
Azure DevOps is Microsoft's all-in-one DevOps platform covering the full software development lifecycle.
**5 main services:**
1. **Azure Bo...
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12Most common system design interview questions for software engineers
Top system design questions asked at product companies:
1. **Design a URL shortener** (Bit.ly)
2. **Design Twitter/Instagram** (social medi...
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13How many months does it take to learn full stack development?
Timeline to become job-ready in full stack:
**With dedicated learning (6-8 hours/day):**
- HTML/CSS/JS basics: 1 month
- React (frontend): ...
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14What is Docker and why do developers use it?
Docker is a containerisation platform that packages your application and all its dependencies into a portable container.
**Why use it:**
- ...
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15What is Node.js and why is it used?
Node.js is a JavaScript runtime built on Chrome's V8 engine that lets you run JavaScript on the server side.
**Why use it:**
- **Non-blocki...
