Company: Directi(Titan) | Internship | Selected
Education: BTech from tier-2 college, final year CS
Date: January 2024
Rounds: 2

Round 1: Data Structures and Algorithms

• DSA Problem: The interview involved solving a single problem Codeforces (1661C), which I had previously encountered. I gave two solutions one using binary search and other using maths, then interviewer asked to code the binary search solution.

Round 2: CS Fundamentals and System Design

• CS Fundamentals:
  • HTTP vs HTTPS: The interviewer asked about the differences between HTTP and HTTPS. I explained the role of SSL/TLS in securing communication, the encryption of data, and the authentication of servers.
  • Database Isolation Levels: The interviewer asked me to explain isolation and it's types, I discussed different levels of isolation in databases—Read Uncommitted, Read Committed, Repeatable Read, and Serializable—and I discussed the trade-offs between consistency and performance.
  • Transactions in SQL: Told the theoratical definition but wasn't able to write sample SQL query implementing transactions.

.After CS fundamental questions interviewer said that he will raise the bar now since things are going too smooth.

• System Design:
  • Design PUBG Waiting Queue: I wasn't prepared for a system design question, so I initially approached it like a DSA problem. The interviewer provided several hints along the way, but I wasn’t confident in many of the suggestions I made during the discussion.

Verdict: Selected, Stipend 60k INR/month