One of the biggest mistakes students make is preparing the same way for every company.

Every company has a different hiring process and looks for different skills. Understanding what a company expects helps you prepare more effectively.

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Types of Companies

1. Service-Based Companies

Examples:

• TCS
• Infosys
• Wipro
• Accenture
• Cognizant
• Capgemini
• Tech Mahindra
• LTIMindtree

What They Usually Test

• Aptitude
• Logical Reasoning
• Verbal Ability
• Basic Programming
• Communication Skills
• HR Interview

DSA Level

Basic to Intermediate

Topics to focus on:

• Arrays
• Strings
• Linked Lists
• Sorting
• Searching
• Basic Hashing

Preparation Strategy

• Practice aptitude daily.
• Solve previous-year company questions.
• Revise programming fundamentals.
• Prepare common HR interview questions.
• Focus on speed and accuracy.

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2. Product-Based Companies

Examples:

• Google
• Microsoft
• Amazon
• Adobe
• Atlassian
• Oracle
• Salesforce
• Intuit

What They Usually Test

• Strong Data Structures & Algorithms
• Problem Solving
• Core Computer Science
• Projects
• Coding Interviews
• Behavioral Interviews

DSA Level

Intermediate to Advanced

Topics to focus on:

• Trees
• Graphs
• Dynamic Programming
• Greedy
• Backtracking
• Heaps
• Tries
• Binary Search

Preparation Strategy

• Practice DSA consistently.
• Complete a structured DSA sheet.
• Participate in coding contests.
• Learn to explain your approach clearly.
• Build strong projects that demonstrate real skills.

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3. Startups

Examples:

• Razorpay
• Zepto
• CRED
• BrowserStack
• Postman
• Meesho
• Swiggy
• Zomato

What They Usually Test

• Development Skills
• Projects
• Practical Problem Solving
• API Design
• Debugging
• System Design (sometimes)
• Ownership and Learning Ability

DSA Level

Basic to Intermediate

Preparation Strategy

• Build real-world projects.
• Deploy your applications.
• Keep your GitHub profile active.
• Learn one tech stack deeply.
• Be ready to explain every technical decision in your projects.

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How to Research a Company

Before applying or attending an interview, spend some time researching the company.

Find answers to questions like:

• What products or services does the company build?
• What technologies do they use?
• What does the interview process look like?
• What skills are commonly expected?
• What kind of projects do employees work on?
• What values does the company emphasize?

This helps you tailor your preparation and answer interview questions more confidently.

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What to Revise Before Any Interview

No matter which company you’re interviewing for, make sure you’ve revised:

• Data Structures & Algorithms
• Object-Oriented Programming
• Database Management Systems (DBMS)
• Operating Systems
• Computer Networks
• SQL Basics
• Your Resume
• Every Project Mentioned on Your Resume

If it’s on your resume, you should be able to explain it in detail.

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Common Mistakes

Avoid these common mistakes:

• Preparing the same way for every company.
• Ignoring aptitude for service-based companies.
• Neglecting projects when applying to startups.
• Focusing only on DSA while ignoring core subjects.
• Applying without researching the company.
• Memorizing interview answers instead of understanding concepts.

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Final Advice

There is no single preparation strategy that works for every company.

• Service-based companies value speed, aptitude, and communication.
• Product-based companies expect strong DSA and problem-solving skills.
• Startups care about your ability to build real software and learn quickly.

The better your preparation matches the company’s hiring process, the higher your chances of getting selected.