Tower Research

Role: SDE 2 (C++ Developer)

College: Not Specified

Interview Date: November 2021 (Online Test), January 2022 (Interview rounds)

Interview Type: Full-Time

Result: Rejected

Difficulty: Medium-Hard

Rounds: Online Test + 2 Technical Rounds

Topics Asked: Data Structures, OOP, OS, Networking, C++ (code debugging, classes, virtual functions, virtual tables, deep understanding), Algorithms (Bellman-Ford, Trie-based question), Low-Level System Design (for a high-frequency trading company, concepts like callback and observers).

Experience:

This candidate interviewed for an SDE 2 (C++ Developer) role in Gurgaon in November 2021, receiving a rejection in January 2022. The process started with an Online Test.

The Online Test had three sections. The first section contained 7 MCQ questions mostly from Data Structures, OOP, OS, and Networking. The second section had two code debugging questions. The last section included two coding questions: one easy Bellman-Ford question and another LeetCode hard-level question. The online test was considered medium-hard.

Round 1, lasting 45 minutes, was taken by a senior team member. It involved discussions around network TCP and UDP protocols, a small C++ code snippet with errors to identify, and a Trie-based question not found on LeetCode, which required processing strings backward for optimal complexity.

Round 2 was also conducted by a senior in the team and focused heavily on C++. In-depth questions were asked about classes, virtual functions, and virtual tables, requiring a very granular understanding of C++ OOP. Following this, a Low-Level System Design question was posed: to design an LLD for a high-frequency trading company, focusing on concepts like callbacks and observers, and proper class implementation. The candidate felt this round did not go well, leading to no further interviews.