Infosys Interview Questions

Q1. Tell me about yourself.

Cover your education, one or two relevant projects or skills, and why a software engineering role at Infosys fits your goals — in about 60–90 seconds, ending on enthusiasm.

Q2. What is pseudocode and why does Infosys test it?

Pseudocode expresses an algorithm in plain, language-independent steps. Infosys uses it to test whether you can reason about logic and trace code output regardless of syntax.

Q3. Explain the difference between == and .equals() in Java.

== compares references (whether two variables point to the same object) for objects, and values for primitives. .equals() compares content/value as defined by the class, e.g. String.equals compares characters.

Q4. What is a deadlock and how do you prevent it?

A deadlock is when two or more processes wait forever for resources the others hold. Prevent it by breaking one of the four Coffman conditions — e.g. acquire locks in a fixed global order, or use timeouts.

Q5. What is the difference between WHERE and HAVING in SQL?

WHERE filters rows before grouping and can't use aggregate functions; HAVING filters groups after GROUP BY and can use aggregates like COUNT or SUM.

Q6. Explain time complexity and give examples.

Time complexity describes how runtime grows with input size using Big-O. O(1) constant, O(log n) binary search, O(n) linear scan, O(n log n) good sorts, O(n²) nested loops.

Q7. What are the different types of inheritance?

Single, multilevel, hierarchical, multiple (via interfaces in Java), and hybrid. Java avoids multiple class inheritance to prevent the diamond problem, using interfaces instead.

Q8. What is a foreign key?

A foreign key is a column that references the primary key of another table, enforcing referential integrity so you can't insert an orphan row that points to a non-existent parent.

Q9. Reverse a string without using a built-in reverse.

Use two pointers, one at each end, swap characters and move inward until they meet; or build a new string iterating from the last index. Both are O(n).

Q10. What is the difference between process and thread?

A process is an independent program with its own memory space; a thread is a lightweight unit within a process that shares the process's memory. Threads are cheaper to create and switch between.

Q11. Why Infosys?

Cite Infosys's global reputation, strong fresher training (Mysore campus / Infosys Springboard), exposure to modern tech and digital projects, and structured growth — tied to your goal of a strong start.

Q12. Are you comfortable relocating and working in any shift?

Yes — express clear flexibility on location and shifts. Infosys deploys freshers across locations and client time zones.

Q13. What is a virtual function?

A virtual function (C++) is a base-class function you can override in a derived class, resolved at runtime (dynamic dispatch) via the vtable — enabling runtime polymorphism.

Q14. What are your strengths?

Pick one relevant strength (adaptability, problem-solving, quick learning) and prove it with a specific project or academic example.

Q15. Do you have questions for us?

Yes — ask about the training journey, technologies a fresher works on, or how Infosys supports certifications. It shows initiative.

InfyTQ is Infosys's certification and hiring platform for engineering students, used as an entry route into the SE/DSE roles alongside campus drives.

It's tricky if unprepared because it's language-agnostic and focuses on tracing logic. Regular output-prediction practice makes it very manageable.

DSE (Digital Specialist Engineer) is the higher-package role needing a strong coding round; SE (System Engineer) is the standard fresher role.