🎯 Infosys Specialist Programmer (SP) Interview Guide – 2025 Edition
If you’re preparing for the Infosys SP (Specialist Programmer) role, this guide will help you understand the interview process, topics to cover, and how to approach your preparation in 2025.
📌 Interview Pattern
You can expect a single technical interview, usually conducted offline. The format is fairly structured and includes the following:
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A short self-introduction
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One or two DSA questions, often followed by deeper discussion
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Questions on core CS fundamentals such as OOPs, DBMS, OS, and CN
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A detailed discussion around your projects and resume
💬 Interview Experience Highlight
Here’s a breakdown of what I was asked during my interview:
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The first question involved a basic array problem. Although it wasn’t from LeetCode, it was intuitive. I solved it in O(n²) time but couldn’t optimize further.
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I was also asked several project-related questions to gauge my hands-on experience.
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One question focused on ACID properties in databases.
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Concepts like method overloading and overriding were discussed, including real-life examples and limitations.
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The interviewer brought up dependency injection and asked about its purpose.
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I was asked, “Why doesn’t Java support multiple inheritance?” – A popular conceptual question.
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A Java code snippet involving inheritance and overriding was shown, and I had to determine the output.
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There were also technical questions on HashMap internals, followed by discussions on sorting algorithms like Merge Sort and Bubble Sort.
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Lastly, we touched on Java memory management and OOP concepts.
🟢 Overall, the interview was positive. Don’t let online reviews discourage you – each experience is different.
💻 DSA Preparation – LeetCode Focus
A curated LeetCode list can significantly help you cover relevant topics.
📂 Frequently Asked Areas:
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Two pointers, stacks, and linked lists
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Heaps, graphs, and dynamic programming
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Searching and sorting algorithms
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String manipulation and recursion
✅ Must-Solve Problems:
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Swap two numbers without using a third variable
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Find the next smallest palindrome
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Rotten Oranges (BFS problem)
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Longest Common Subsequence (LCS)
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Detect a cycle in a directed graph
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Lexicographically smallest equivalent string
To build confidence, explore Striver’s DSA Sheet or NeetCode 150.
🧠 CS Fundamentals Checklist
Covering the following topics will give you an edge:
🔹 DBMS
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ACID properties and SQL joins
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Truncate vs Delete commands
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Indexing, views, and triggers
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Normal forms (3NF, BCNF)
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DDL vs DML operations
🔹 Operating Systems
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CPU scheduling types
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Deadlock and its prevention
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Process lifecycle and virtual memory
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Semaphores and multithreading
🔹 Computer Networks
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TCP vs UDP
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Sessions vs sockets
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OSI and TCP/IP models
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IP address vs MAC address
🔹 OOPs in Java
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Four pillars: Encapsulation, Abstraction, Inheritance, Polymorphism
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Method overloading vs overriding
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Interface vs abstract class
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Constructors, access specifiers
🔹 Software Development Life Cycle (SDLC)
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Waterfall and Agile methodologies
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Common design patterns used in projects
🧾 Resume & Project Tips
Here are some things to keep in mind while preparing your resume discussion:
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Be ready to explain how your project works, from architecture to implementation.
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Talk about your exact role, the challenges you faced, and how you overcame them.
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If a technology or tool is on your resume, know it well – interviewers may dive deep.
🔗 Recommended Resources
✅ Pro Tip for Final Prep
To succeed, focus on mastering the basics. Regular practice, clear understanding of core subjects, and a calm mind can help you crack the SP interview. Even if the problem looks new, breaking it down and applying fundamentals will take you far.
