How to Prepare for Infosys Interview 2026 — Complete Guide
Step-by-step preparation guide for Infosys interviews. Covers what to study, how long to prepare, top resources, and 14 real questions reported by engineers who cleared the Infosys process.
Step 1 — Understand what Infosys actually tests
Based on 14 questions reported by engineers, Infosys focuses on: Domain, System Design, Behavioral, Business Analysis / Use Cases, React / Hooks, React / Performance, Node.js / Middleware.
Step 2 — Study the right topics in order
- Domain — 8 questions. Start here — highest weight in technical rounds.
- System Design — 1 questions. Second priority after the first topic.
- Behavioral — 1 questions. Cover once the first two topics are solid.
- Business Analysis / Use Cases — 1 questions. Cover once the first two topics are solid.
- React / Hooks — 1 questions. Cover once the first two topics are solid.
- React / Performance — 1 questions. Cover once the first two topics are solid.
- Node.js / Middleware — 1 questions. Cover once the first two topics are solid.
Step 3 — Practice with real questions
These are the most upvoted questions engineers report being asked at Infosys:
What is the difference between String, StringBuilder, and StringBuffer in Java? When would you use each? Explain immutability, thread safety, performance implications, and give an example where using String in a loop causes excessive object creation.
Explain the Java Memory Model. What are heap and stack? How does garbage collection work? Describe generational GC (Young, Old, Metaspace), GC roots, mark-and-sweep, and how to diagnose memory leaks with tools like VisualVM or jmap.
Your Node.js app has a middleware that adds request logging. In production, every slow request shows the same log message appearing 3 times. Why might this happen?
How do you implement custom validation in Spring Boot? Explain the approach using @Constraint and ConstraintValidator, where to place the annotation, and how to return meaningful error messages through BindingResult.
What is the difference between a use case and a user story? When do you use each?
Step 4 — Analyse the job description
Paste the exact Infosys JD into Stepkai's AI tool. It will extract the competencies being tested, score your current readiness, and generate a personalised day-by-day plan targeting your specific gaps — not a generic checklist.
Step 5 — Mock interview
Practice answering Infosys questions with AI grading. Get instant feedback on depth, correctness, and communication before the real thing.
Start practising →