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Infosys Systems Engineer (SE)

Infosys Systems Engineer (SE) · Interview questions

Infosys Systems Engineer (SE) technical interview questions

20 questions that come up in the Infosys Systems Engineer (SE) technical interview, covering Project walk-through, OOP, DBMS, DSA. The first ones include a model answer; the full set of answers is in the interview pack.

Fact-checked 27 October 2026· Company profiles, fact-checked 27 Oct 2026

What the technical interview covers

  • Project walk-through
  • OOP
  • DBMS
  • DSA

20 questions to prepare

  1. 1.Walk me through your final-year project.

    What a good answer covers

    • The problem in one line
    • Your exact role (not the team’s)
    • Tech stack and why
    • One hard bug and how you fixed it
    • Result or what you would improve

    Sample answer

    My project is a library seat-booking app for our college. Students wasted time finding free seats, so we built a web app where they book a seat for a slot. I built the backend in Java with Spring Boot and MySQL, and the booking logic. The hardest part was two students booking the same seat at once; I fixed it with a unique constraint on seat and slot plus a transaction, so the second booking fails cleanly. About 300 students used it in the pilot. Next I would add a waitlist.

    Follow-up to expect: Why MySQL and not MongoDB? What would break first with 10,000 users?

  2. 2.Which programming language are you most comfortable with, and why?

    What a good answer covers

    • Name ONE language you can defend
    • What you have built in it
    • One feature you like and can explain

    Sample answer

    Java. I used it for my project and for DSA practice. I like that it is strongly typed, so many mistakes are caught at compile time, and its collections (ArrayList, HashMap) cover most problems I solve.

    Follow-up to expect: Expect deep questions in that language: keep the answer to a language you really know.

  3. 3.What are the four pillars of OOP? Give an example of each.

    What a good answer covers

    • Encapsulation, Abstraction, Inheritance, Polymorphism
    • One real example per pillar

    Sample answer

    Encapsulation: a BankAccount keeps balance private and changes it only through deposit() and withdraw(). Abstraction: a Vehicle interface exposes start() without showing engine details. Inheritance: Car extends Vehicle and reuses its code. Polymorphism: the same start() call runs Car’s or Bike’s version depending on the object.

    Follow-up to expect: Difference between abstraction and encapsulation?

  4. 4.What is the difference between method overloading and overriding?

    Model answer in the Infosys Systems Engineer (SE) interview pack

  5. 5.Abstract class vs interface: when would you use each?

    Model answer in the Infosys Systems Engineer (SE) interview pack

  6. 6.What is a constructor? Can it be private?

    Model answer in the Infosys Systems Engineer (SE) interview pack

  7. 7.What is the difference between a primary key and a foreign key?

    Model answer in the Infosys Systems Engineer (SE) interview pack

  8. 8.Explain normalization. What are 1NF, 2NF and 3NF?

    Model answer in the Infosys Systems Engineer (SE) interview pack

  9. 9.What are the types of SQL joins?

    Model answer in the Infosys Systems Engineer (SE) interview pack

  10. 10.Write a query to find the second highest salary.

    Model answer in the Infosys Systems Engineer (SE) interview pack

  11. 11.What is the difference between DELETE, TRUNCATE and DROP?

    Model answer in the Infosys Systems Engineer (SE) interview pack

  12. 12.What are ACID properties?

    Model answer in the Infosys Systems Engineer (SE) interview pack

  13. 13.Array vs linked list: when would you use each?

    Model answer in the Infosys Systems Engineer (SE) interview pack

  14. 14.Stack vs queue, with a real use of each.

    Model answer in the Infosys Systems Engineer (SE) interview pack

  15. 15.How would you reverse a string? What is its time complexity?

    Model answer in the Infosys Systems Engineer (SE) interview pack

  16. 16.What is the time complexity of binary search, and what does it need?

    Model answer in the Infosys Systems Engineer (SE) interview pack

  17. 17.Explain any one sorting algorithm and its complexity.

    Model answer in the Infosys Systems Engineer (SE) interview pack

  18. 18.What is the difference between a process and a thread?

    Model answer in the Infosys Systems Engineer (SE) interview pack

  19. 19.What happens when you type a URL in the browser?

    Model answer in the Infosys Systems Engineer (SE) interview pack

  20. 20.Do you know any cloud or AI basics? (Infosys values learning agility.)

    Model answer in the Infosys Systems Engineer (SE) interview pack

Unlock all 20 model answers

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Frequently asked questions

What is asked in the Infosys Systems Engineer (SE) technical interview?

Project walk-through, OOP, DBMS, DSA. A typical opener: "Walk me through your final-year project."

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