Twilio

Role: Summer Internship (Software Engineer Intern)

College: Not Specified

Interview Date: Prior to June 2021 (Internship in June-July 2021)

Interview Type: Internship

Result: Hired

Difficulty: Easy to Medium

Rounds: 3 rounds

Topics Asked: Strings, Data Structures (Queue, Graph), Algorithms, Behavioral (Twilio Magic)

Experience:

This experience details an internship interview process for Twilio.

Round 1: Coding Test
This round involved 2 coding questions to be completed in 60 minutes. The questions were described as "fairly simple" and were based on strings. One specific question was related to phone numbers, involving their validation and categorization by verifying substrings. The candidate submitted early and wrote clean code.

Round 2: Coding Interview
This was a real-time coding session with an interviewer. The main question was a graph problem involving flights from airports. Initially, it involved mapping one airport to one destination, then multiple flights from a single airport, requiring a switch from `map` to `map>`. The last part of the question involved cycles in the graph, which the candidate did not have time to complete. The interviewer wanted the code to run, and the candidate switched from C++ to Java due to import issues to get the code working.

Round 3: Hiring Manager Interview
The final round was with a hiring manager. It began with an introduction, where the candidate discussed programming languages they knew and their experience sharing knowledge. Behavioral questions included: "Have you had a conflict with a teammate?", and "Have you ever missed a deadline, what did you do in that situation?". A technical question was also asked: "How a queue can be implemented using 2 stacks". The interviewer assessed alignment with "Twilio Magic" values.

Overall Experience: The interviewers were friendly, and the process was smooth. The candidate received an offer for the summer internship the same night as the interviews.