Interview Questions Tech India 2026: Top 30

Aapne resume bheja, shortlist bhi ho gaye, ab interview call aa gaya. Par asli tension yahi se start hoti hai: “Bhai kya puchenge?” DSA? Project? HR round me salary kaise bolu? Gap year ka answer kya du?

Tech India 2026 me interviews thode change ho chuke hain. Companies sirf “tell me about yourself” nahi puch rahi, ab woh dekh rahi hain ki tum AI tools samajhte ho, real projects bana sakte ho, team me kaam kar sakte ho, aur pressure me clear soch sakte ho ya nahi.

TCS, Infosys, Wipro jaise service companies me fresher roles ₹3.5 LPA se ₹7 LPA tak ja sakte hain. Product companies jaise Razorpay, PhonePe, Swiggy, Zomato, Paytm me SDE roles ₹12 LPA se ₹35 LPA tak bhi touch kar sakte hain, depending on college, skills, internship, DSA, system design, aur project depth.

Is post me top 30 interview questions milenge jo 2026 me Indian tech interviews me actually useful hain. Saath me simple answer approach bhi milega, taaki tu ratta nahi, smart jawab de sake.

Interview Pattern Tech India 2026: Pehle Ye Samjho#

Most tech interviews India me ab 4 type ke rounds me divide hote hain:

1. Online assessment

   • Aptitude
   • Coding questions
   • MCQs on CS basics
   • SQL ya debugging

2. Technical interview 1

   • DSA
   • Programming language
   • Projects
   • OOPs, DBMS, OS, CN

3. Technical interview 2

   • System design for experienced candidates
   • Deep project discussion
   • API design
   • Scalability basics
   • Cloud, DevOps, AI tools awareness

4. HR or managerial round

   • Communication
   • Salary expectation
   • Notice period
   • Team fit
   • Career goals

Agar fresher ho, toh DSA + projects + CS fundamentals sabse important hain.

Agar 1-3 years experience hai, toh current work, ownership, debugging, production issues, API, database, and business impact matter karega.

Agar 4+ years experience hai, toh system design, team collaboration, mentoring, architecture decisions, trade-offs, cost, monitoring, security, sab aayega.

Top 30 Interview Questions Tech India 2026#

1. Tell me about yourself.

Ye sabse common question hai, par yahi pe log boring ho jaate hain.

Galat answer: “Sir my name is Rahul, I am from Kanpur, my father is businessman, my mother is homemaker…”

Better answer structure:

1. Current status
2. Core skills
3. Best project or experience
4. Role ke saath connection

Sample answer:

“Hi, I’m Rahul, a final year B.Tech CSE student. My main skills are Java, Spring Boot, SQL, and basic React. Recently I built a job tracking web app where users can save applications, status, and reminders. Is project me maine REST APIs, MySQL database, authentication, and deployment handle kiya. I’m looking for a backend developer role where I can work on real products and improve my system design skills.”

Short, clear, role-focused.

2. Why do you want to join our company?

Yaha “company ka naam suna hai” type jawab mat dena.

Agar TCS, Infosys, Wipro ho:

“Your company works with large global clients, and I want to learn how enterprise-level software is built, tested, and maintained. As a fresher, mujhe structured training, real projects, and client exposure ka good mix milega.”

Agar Razorpay, PhonePe, Paytm ho:

“I’m interested in fintech because payments require high reliability, security, and scale. Your products are used by millions of users, and I want to work on systems where performance and correctness really matter.”

Agar Swiggy, Zomato ho:

“I like consumer tech because user behavior, location, delivery, payments, and recommendations all connect together. I want to work on products that people use daily.”

3. Explain your best project.

Interviewer ko bas tech stack nahi chahiye, unhe tumhari thinking chahiye.

Answer me ye include karo:

• Problem kya tha?
• Tumne kya build kiya?
• Tech stack kya tha?
• Tumhara contribution kya tha?
• Challenge kya aaya?
• Result kya mila?

Sample:

“I built an expense tracker app for students. Users can add income, expenses, categories, and monthly limits. I used React for frontend, Node.js and Express for backend, MongoDB for database, and JWT for login. Main challenge tha monthly summary fast banana, so I used aggregation queries instead of calculating everything on frontend. Isse dashboard load time around 2 seconds se under 700ms ho gaya.”

Numbers add karoge toh answer strong lagta hai.

4. What is the difference between array and linked list?

Simple language me bolo:

• Array continuous memory me store hota hai
• Linked list nodes me store hoti hai
• Array me index access fast hota hai, O(1)
• Linked list me access O(n)
• Insert/delete linked list me easier ho sakta hai if node known
• Array me resizing issue hota hai

Example:

“Agar mujhe frequently random access chahiye, like marks[5], array better hai. Agar mujhe middle me frequent insert/delete karna hai and size unknown hai, linked list useful ho sakti hai.”

5. What is time complexity?

Time complexity batata hai input size badhne par algorithm ka time kaise grow karega.

Example:

• O(1): constant time
• O(log n): binary search
• O(n): linear search
• O(n log n): merge sort
• O(n²): nested loops

Sample answer:

“If I search an element in unsorted array, worst case me poora array check karna padega, so O(n). But sorted array me binary search use kar sakte hain, so O(log n).”

6. Explain OOPs concepts.

4 pillars bolo:

1. Encapsulation Data and methods ko class ke andar bind karna. Example: private variables with getters/setters.

2. Inheritance Ek class dusri class ke properties reuse karti hai. Example: Car extends Vehicle.

3. Polymorphism Same method different behavior. Example: method overloading and overriding.

4. Abstraction Internal details hide karna, only important features show karna. Example: interface, abstract class.

Java interview me ye pakka aata hai, especially TCS, Infosys, Wipro, Cognizant type companies me.

7. What is difference between interface and abstract class?

Java ke liye good answer:

• Interface contract define karta hai
• Abstract class partial implementation de sakti hai
• Class multiple interfaces implement kar sakti hai
• Java me class ek hi abstract class extend kar sakti hai
• Interface me by default public abstract methods hote the, newer Java versions me default/static methods bhi possible hain

Simple line:

“Interface tells what to do, abstract class can also tell some part of how to do it.”

8. What is REST API?

REST API ek way hai jisse client and server HTTP ke through communicate karte hain.

Common methods:

• GET: data read
• POST: data create
• PUT/PATCH: data update
• DELETE: data delete

Example:

Job portal app me:

• GET /jobs, jobs list
• POST /applications, apply to job
• GET /users/123, user profile
• DELETE /applications/45, application remove

Interview me agar project me API use kiya hai, toh endpoints clearly explain karo.

9. Difference between SQL and NoSQL?

SQL databases structured tables me data store karte hain. Example: MySQL, PostgreSQL.

NoSQL flexible format me store karte hain. Example: MongoDB, Cassandra.

SQL use karo jab:

• Data relational hai
• Transactions important hain
• Joins chahiye
• Banking, orders, payments

NoSQL use karo jab:

• Schema flexible hai
• High scale document storage
• Logs, catalog, user activity
• Fast iteration

Fintech companies jaise Razorpay, Paytm, PhonePe me database consistency ka answer strong hona chahiye.

10. What are indexes in database?

Index database ka shortcut hota hai fast search ke liye.

Example:

Agar users table me 10 lakh rows hain aur email se search karna hai, email column pe index query ko fast bana sakta hai.

But index ka cost bhi hota hai:

• Extra storage
• Insert/update thoda slow ho sakta hai
• Har column pe index banana bad idea hai

Good answer:

“Indexes read queries fast karte hain, but write operations pe overhead add kar sakte hain. Isliye frequently searched columns pe index use karna chahiye.”

Coding And DSA Questions Jo 2026 Me Common Rahenge#

11. Reverse a string.

Simple question hai, but interviewer dekhta hai tum language basics jaante ho ya nahi.

Java approach:

• Two pointer use karo
• Left and right swap karo
• Continue till left < right

Logic:

“String ko char array me convert karunga, left pointer start pe, right pointer end pe. Dono ko swap karte hue center tak jaunga.”

12. Find duplicate number in an array.

Possible approaches:

1. HashSet

   • Time O(n)
   • Space O(n)

2. Sorting

   • Time O(n log n)
   • Space depends

3. Floyd cycle detection

   • Special case when numbers 1 to n range me ho

Interview me pehle simple HashSet bolo, phir optimized discuss karo.

Sample:

“I’ll start with HashSet because it is clean and readable. If interviewer wants constant space and constraints allow, I can discuss Floyd cycle detection.”

13. Check if a string is palindrome.

Palindrome means same forward and backward. Example: madam, racecar.

Approach:

• Left pointer start
• Right pointer end
• Compare characters
• If mismatch, false
• Else true

Agar sentence ho like “A man a plan a canal Panama”, toh spaces and cases ignore karna padega.

14. Two sum problem.

Question: Given array and target, find two numbers whose sum equals target.

Best answer:

Use HashMap.

Steps:

1. Iterate array
2. For each number x, complement = target - x
3. Check if complement already exists in map
4. If yes, return pair
5. Else store x

Time O(n), space O(n).

Ye question product companies me basic screening me common hai.

15. Explain binary search.

Binary search sorted array pe kaam karta hai.

Steps:

1. low = 0, high = n-1
2. mid find karo
3. if arr[mid] == target, return
4. if arr[mid] < target, right half search
5. else left half search

Time O(log n).

Important: mid calculate karte time overflow avoid karo:

mid = low + (high - low) / 2

16. What is recursion?

Recursion means function khud ko call karta hai smaller problem ke liye.

Every recursion needs:

• Base case
• Recursive case

Example factorial:

• fact(0) = 1
• fact(n) = n * fact(n-1)

Interviewer pooch sakta hai recursion ka issue kya hai.

Answer:

“Deep recursion stack overflow cause kar sakta hai. Kabhi-kabhi iterative solution better hota hai.”

17. Difference between stack and queue.

Stack:

• LIFO, Last In First Out
• Example: browser back button, function calls

Queue:

• FIFO, First In First Out
• Example: ticket line, print queue, message queue

In backend interviews, queue ka real use batao:

“Order processing, email sending, notification service me queue use kar sakte hain so main request slow na ho.”

18. What is a hash map?

HashMap key-value store karta hai.

Example:

• email -> userId
• productId -> productDetails
• word -> frequency

Average time:

• insert O(1)
• search O(1)
• delete O(1)

But worst case collisions ke wajah se slow ho sakta hai.

19. Explain sorting algorithms you know.

At least 3 sorting algorithms ready rakho:

1. Bubble sort

   • O(n²)
   • Simple but inefficient

2. Merge sort

   • O(n log n)
   • Stable
   • Extra space needed

3. Quick sort

   • Average O(n log n)
   • Worst O(n²)
   • In-place possible

Good line:

“In real projects, I usually use built-in sort because it is optimized, but conceptually I understand merge sort and quick sort.”

20. How do you approach a coding problem in interview?

Yeh meta question bhi puch lete hain.

Best structure:

1. Problem repeat karo
2. Input/output clarify karo
3. Constraints pucho
4. Brute force bolo
5. Optimize karo
6. Complexity explain karo
7. Edge cases test karo

Example line:

“I don’t directly jump to code. Pehle constraints and edge cases clear karta hoon, then brute force se start karke optimized approach discuss karta hoon.”

Core CS Interview Questions#

21. What is process and thread?

Process independent program hota hai running state me. Thread process ke andar lightweight execution unit hota hai.

Example:

Chrome browser ek process ho sakta hai, multiple tabs ya tasks threads use kar sakte hain.

Differences:

• Process has separate memory
• Threads share memory within same process
• Thread creation faster hota hai
• Thread bugs like race conditions possible hain

22. What is deadlock?

Deadlock tab hota hai jab processes ek dusre ke resources ka wait karte rehte hain and none can proceed.

Classic example:

• Process A holds Resource 1, waits for Resource 2
• Process B holds Resource 2, waits for Resource 1

Conditions:

1. Mutual exclusion
2. Hold and wait
3. No preemption
4. Circular wait

Agar OS padha hai toh ye question almost guaranteed hai.

23. What is normalization in DBMS?

Normalization database design ka method hai jisse data duplication reduce hota hai and consistency improve hoti hai.

Common forms:

• 1NF: atomic values
• 2NF: no partial dependency
• 3NF: no transitive dependency

Simple example:

Agar student table me course details repeatedly store kar rahe ho, toh course ko separate table me move kar sakte ho.

24. What is ACID property?

ACID database transactions ko reliable banata hai.

1. Atomicity Transaction fully complete ya fully fail.

2. Consistency Database valid state me rahe.

3. Isolation Multiple transactions ek dusre ko wrongly affect na karein.

4. Durability Commit ke baad data safe rahe.

Fintech interviews me, ACID ka real example do:

“Payment transfer me debit success and credit fail nahi hona chahiye. Either both happen or none happen.”

25. Difference between TCP and UDP.

TCP:

• Reliable
• Connection-oriented
• Ordered delivery
• Example: web browsing, file transfer

UDP:

• Faster
• Connectionless
• No delivery guarantee
• Example: video streaming, online gaming, voice calls

Good line:

“If reliability important hai toh TCP, speed and low latency important hai toh UDP.”

System Design And Practical Tech Questions#

26. Design a URL shortener like bit.ly.

Fresher ko full system design nahi chahiye, but basic clarity honi chahiye.

Requirements:

• Long URL ko short code me convert karna
• Short URL open karne par redirect
• Track clicks if needed
• Handle duplicate long URLs
• Expiry optional

Basic design:

1. User submits long URL
2. Backend generates unique short code
3. Store in DB: shortCode, longUrl, createdAt
4. User opens short URL
5. Backend finds long URL and redirects

Tech choices:

• Backend: Node.js, Java Spring Boot, Go
• DB: PostgreSQL or MySQL
• Cache: Redis for popular URLs
• Analytics: separate events table or queue

Scalability point:

“Popular short URLs ke liye Redis cache use karunga so DB pe load kam ho.”

27. How would you design a food delivery app feature?

Swiggy, Zomato type interviews me ye useful hai.

Feature: live order tracking.

Components:

• Customer app
• Delivery partner app
• Restaurant app
• Backend
• Location service
• Notification service

Flow:

1. Restaurant accepts order
2. Delivery partner assigned
3. Partner app sends location every few seconds
4. Backend stores latest location
5. Customer app receives updates through polling or WebSocket
6. Notifications sent for picked up, nearby, delivered

Important concerns:

• Battery usage
• Location accuracy
• Network failure
• Privacy
• High traffic during lunch/dinner

28. How do you debug a production issue?

Experienced candidates ke liye ye very important hai.

Strong answer:

1. First impact check karunga: kitne users affected?
2. Logs and metrics dekhunga
3. Recent deployments check karunga
4. Error pattern identify karunga
5. Rollback needed hai ya hotfix?
6. Root cause document karunga
7. Future prevention add karunga: tests, alerts, monitoring

Sample:

“If payment failures suddenly increase, I’ll check gateway response codes, recent release, DB errors, timeout metrics, and queue delays. Agar release related hai, rollback karunga, then root cause fix.”

29. How do you use AI tools in development?

2026 me ye question kaafi common hoga. Companies chahti hain ki tum AI use karo, but blindly copy paste na karo.

Good answer:

“I use AI tools for boilerplate code, test case ideas, debugging hints, and documentation drafts. But I verify logic, security, performance, and edge cases myself. Sensitive company code or secrets AI tool me paste nahi karta.”

AI tools ke smart use cases:

• Unit test generation
• Regex explanation
• SQL query optimization ideas
• Code review checklist
• API documentation
• Error message explanation

Bad answer:

“ChatGPT se pura code bana leta hoon.”

Better answer:

“AI speeds up routine tasks, but final responsibility developer ki hoti hai.”

30. What is your salary expectation?

Yaha panic mat karo. Range and market research important hai.

Fresher service company:

• TCS Ninja type roles: around ₹3.3 LPA to ₹4 LPA
• Infosys/Wipro freshers: around ₹3.5 LPA to ₹5 LPA
• Digital specialist roles: ₹6 LPA to ₹9 LPA

Product company fresher:

• Paytm, PhonePe, Razorpay, Swiggy, Zomato SDE: often ₹12 LPA to ₹30 LPA depending on role, college, internship, interview performance

Experienced:

• 1-2 years backend developer: ₹8 LPA to ₹18 LPA
• 3-5 years strong product experience: ₹18 LPA to ₹40 LPA
• Senior roles can go higher

Safe answer:

“Based on my skills, role expectations, and market range, I’m looking for something around ₹X LPA to ₹Y LPA. But I’m open to discussing based on overall compensation, learning, team, and growth.”

Agar current CTC hai:

“My current CTC is ₹8 LPA, and based on my experience and the role responsibilities, I’m expecting around ₹12 LPA to ₹14 LPA.”

Bonus HR Questions Jo Ignore Mat Karna#

Tech strong hai but HR me casual ho gaye toh offer atak sakta hai.

Why should we hire you?

Structure:

• Skills
• Proof
• Attitude
• Role fit

Sample:

“You should hire me because I have strong basics in Java, SQL, and backend development. I’ve built projects with authentication, REST APIs, and database design. I also learn fast and take feedback seriously. For this role, I can contribute as a junior developer and keep improving with the team.”

What are your strengths?

Avoid generic “hardworking” only.

Better:

“My strength is breaking problems into small parts. For example, in my project, login, dashboard, database, and API errors were all handled step by step instead of randomly coding everything.”

Other good strengths:

• Debugging patience
• Clear communication
• Ownership
• Consistent learning
• Writing clean code

What is your weakness?

Don’t say fake weakness like “I’m perfectionist.”

Better:

“Earlier I used to spend too much time trying to solve errors alone. Now I time-box debugging. Agar 45-60 minutes me stuck hoon, I document what I tried and ask for help clearly.”

This sounds mature.

Why do you have a career gap?

Be honest, but don’t over-explain.

Sample:

“I had a gap because I was preparing for exams and improving my technical skills. During this time, I completed Java, SQL, and backend projects. I’m now fully ready for a full-time role.”

If health/family reason:

“I had personal responsibilities during that period, but now the situation is stable. I used the recent months to revise core concepts and build projects.”

Are you willing to relocate?

If yes:

“Yes, I’m open to relocating for the right opportunity.”

If no:

“Currently I prefer roles in Bengaluru/Pune/Hyderabad or remote due to personal reasons, but I’m open to discussing hybrid options.”

How To Prepare For Tech Interviews In 30 Days#

Agar interview 1 month baad hai, toh random YouTube marathon mat karo. Plan follow karo.

Week 1: Resume and basics

Focus:

• Resume revise
• Projects explain karna practice
• OOPs
• DBMS
• SQL basics
• Git basics

Daily tasks:

• 2 SQL queries
• 1 project explanation practice
• 30 minutes OOPs/DBMS revision

Week 2: DSA basics

Focus:

• Arrays
• Strings
• HashMap
• Stack
• Queue
• Recursion
• Sorting
• Binary search

Daily tasks:

• 2 coding problems
• Complexity explain karo
• Edge cases likho

Week 3: Advanced practice

Focus:

• Linked list
• Trees basics
• Graph basics if product company target hai
• Dynamic programming basics
• API design
• Database indexing

Daily tasks:

• 2-3 DSA problems
• 1 mock interview
• 1 system design basic topic

Week 4: Mock interviews and HR

Focus:

• 5 mock interviews
• Salary answer
• Company research
• Behavioral questions
• Communication practice

Daily tasks:

• Record yourself answering “Tell me about yourself”
• Revise 2 projects deeply
• Read company tech blogs if available
• Prepare 3 questions to ask interviewer

Mistakes Jo Indian Tech Candidates Bahut Karte Hain#

1. Resume me fake skills daalna

Agar resume me Docker likha hai, interviewer puch sakta hai:

• Dockerfile kya hota hai?
• Image and container difference?
• Docker compose kyun use hota hai?

Nahi aata toh trust down.

2. Project explain nahi kar paana

GitHub pe project hai but tumhe khud flow nahi pata, red flag.

Har project ke liye ready rakho:

• Architecture
• Database schema
• APIs
• Authentication
• Error handling
• Deployment
• Future improvements

3. Sirf syntax yaad karna

Interviewer ko language syntax se zyada logic chahiye.

Agar Java me code nahi yaad aa raha, pseudocode bolo. Clear thinking dikhao.

4. “I don’t know” bolne se darna

Agar nahi pata, confidently bolo:

“I’m not fully sure about this, but my understanding is…”

Ya:

“I haven’t worked on this directly, but I can try to reason it out.”

Fake answer se better honest attempt hai.

5. Company research skip karna

Agar Razorpay interview hai aur tum payments basics nahi jaante, weak impression.

Agar Swiggy/Zomato hai, logistics, location, recommendation, order flow basics socho.

Agar Infosys/TCS/Wipro hai, client work, training, enterprise projects, support and development mix ke liye ready raho.

Questions You Should Ask Interviewer#

Interview ke end me jab woh bole “Do you have any questions?”, kabhi mat bolo “No sir.”

Ask smart questions:

1. “This role me first 3 months me main responsibilities kya hongi?”
2. “Team ka tech stack kya hai?”
3. “Is role me development, testing, support ka mix kaisa hai?”
4. “Code reviews and deployments ka process kaisa hai?”
5. “Freshers ke liye training or mentorship structure hai?”
6. “Success in this role ko kaise measure karte hain?”

Ye dikhata hai ki tum serious ho.

Final Checklist Before Interview#

Interview se ek din pehle ye kar:

• Resume PDF open karke har line explain kar
• 2 best projects revise kar
• 10 common DSA patterns dekh
• OOPs, DBMS, OS short notes revise kar
• Company ka product/service samajh
• Salary range decide kar
• Laptop, internet, camera, mic test kar
• 2 formal shirts ready rakh, online ho tab bhi
• Sleep properly, all-nighter mat kar

Interview ke 30 minutes pehle:

• Phone silent
• Water bottle side me
• Resume open
• Notepad ready
• Calm breathing
• “I can think out loud” mindset

Final Words: Interview Ratta Nahi, Conversation Hai#

Tech India 2026 me competition high hai, agreed. Ek fresher role ke liye 1000+ applicants aa sakte hain. Product company SDE role me DSA strong candidates bhi reject hote hain.

Par good news ye hai: most candidates preparation scattered rakhte hain. Agar tum 30 questions properly prepare kar lo, projects deeply samajh lo, DSA basics strong kar lo, and HR answers natural rakh lo, tum already top crowd me aa jaoge.

Interview me perfect hona zaroori nahi. Clear hona zaroori hai.

Agar answer nahi pata, socho. Agar stuck ho, interviewer se hint lo. Agar project me mistake thi, accept karo and batao kya improve karoge. Ye maturity companies ko pasand aati hai.

Aur haan, interview call tabhi aayega jab resume ATS aur recruiter dono ko pass karega. Isliye apply karne se pehle apna resume check karna mandatory hai.

Apna resume free me scan karo, ATS score dekho, missing keywords pakdo, aur improve karo: JobRise Free ATS Checker