openai | Software Engineer | Interview Experience
Interview Date: Not specified
Result: Not specified
Difficulty: Not specified
Interview Process
The interview consisted of two main questions. The first was a system design question where the candidate was asked to design a Slack-like application. There was an initial confusion when the secondary interviewer was unexpectedly switched to the primary role, which delayed the start of the interview by ten minutes. The system design portion lasted 45 minutes, followed by 5 minutes for questions. The candidate designed a channel service to manage user and channel information and a message service to handle messages. They discussed how to generate message IDs and addressed the issue of loose ordering in message delivery, particularly how to handle messages that arrive at exactly the same time. The candidate proposed using webhooks to deliver messages to the Slack client but ran out of time to elaborate further.
The second question involved serializing a memory key-value store to a file and then deserializing it back. There were follow-up questions regarding what to do if the file size exceeded 1k, but the candidate felt they managed to answer satisfactorily, receiving positive feedback from the interviewer.
Technical Questions
- System Design: Design a Slack-like application
- Serialization: Serialize a memory key-value store to a file and deserialize it
Tips & Insights
The candidate felt unprepared for the first question and recognized the importance of thorough preparation for system design interviews. They noted the need to practice handling unexpected changes during the interview process.