Directi | Intern | Accepted

Round 1: Data Structures and Algorithms

Questions:

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

Round 2: CS Fundamentals and System Design

Questions:

• 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 its types. I discussed different levels of isolation in databases—Read Uncommitted, Read Committed, Repeatable Read, and Serializable—and the trade-offs between consistency and performance.
  • Transactions in SQL: I provided the theoretical definition but wasn't able to write a sample SQL query implementing transactions.

  After the CS fundamental questions, the interviewer mentioned that he would raise the bar since things were going too smoothly.

• 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.