Infosys Specialist Programmer (SP) L1 – On-Campus Interview Experience

Interview Experience | On-Campus Placement

My Infosys Specialist Programmer L1 interview was focused on DSA, problem-solving, OOPs, RAG (Retrieval-Augmented Generation), and SQL.

1. DSA and Coding Round

The interview started with DSA questions. The interviewer asked me to open LeetCode and solve coding problems.

• Around 4 coding questions were given.
• The questions covered general DSA concepts.
• I was expected to explain my approach, logic, and time and space complexity.
• The interviewer focused on problem-solving ability and code optimization.

2. Wingspan / Coding Assessment

There was also a 30-minute coding segment involving a greedy-based problem.

• A greedy algorithm problem was asked.
• I had to identify the optimal approach and explain the reasoning.
• Time management and efficient implementation were important.

3. OOPs

After the coding discussion, the interviewer asked a few OOPs questions, covering fundamental object-oriented programming concepts.

Important topics to prepare:

• Four pillars of OOPs.
• Inheritance and polymorphism.
• Function overloading vs overriding.
• Abstraction vs encapsulation.
• Virtual functions and runtime polymorphism.

4. RAG (Retrieval-Augmented Generation)

The interviewer also asked about RAG, an important concept in Generative AI.

Topics to prepare:

• What is RAG?
• Why is RAG used?
• How does a RAG pipeline work?
• Embeddings and vector databases.
• Retrieval vs generation.
• RAG vs fine-tuning.

5. SQL

The interview also included SQL-related questions.

Important topics:

• Joins (INNER, LEFT, RIGHT).
• GROUP BY and HAVING.
• Aggregate functions.
• Subqueries.
• Primary key and foreign key.
• Second-highest salary query.
• DELETE vs TRUNCATE vs DROP.

Overall Experience

The interview covered multiple areas, with a strong emphasis on DSA and coding, followed by OOPs, RAG, and SQL.

My preparation advice: Focus on LeetCode problem-solving, greedy algorithms, core OOPs concepts, SQL queries, and basic Generative AI concepts, especially RAG.

_Note: This experience has been reconstructed from my recollection of the interview. The exact coding questions and individual OOPs/SQL questions are not specified._