This is a straight-to-the-point, distilled list of technical interview Do's and Don'ts **for interviewers**, mainly for algorithmic interviews. Some of these may apply to only phone screens or whiteboard interviews, but most will apply to both. I revise this list before each of my interviews as an interviewer to remind myself of them and eventually internalized all of them to the point I do not have to rely on it anymore.
**If you are a candidate you probably do not need to know this section well. You may read this to get a better sense of what an interviewer is supposed to do during an interview.**
#### Legend
- ✅ = Do
- ❌ = Don't
- ⚠️ = Situational
### Before interview
| | Things |
| --- | --- |
| ✅ | Make sure your surroundings are well-lit. |
| ✅ | Find a quiet environment with good Internet connection. |
| ✅ | Ensure webcam and audio are working. Test that your VC app is working well. |
| ✅ | Prepare two to three questions and be familiar with the different approaches for solving the questions. |
| ✅ | Familiarize yourself with the coding environment (CoderPad/CodePen). Set up the coding shortcuts, turn on autocompletion, tab spacing, etc. |
### Introduction
| | Things |
| --- | --- |
| ✅ | Check if candidate wants to use the restroom or take a break. |
| ✅ | Give an overview of the interview format (introduction, duration, programming languages available, 5 min at the end for Q&A). |
| ✅ | Do a self-introduction and get the candidate to introduce themselves. |
| ✅ | Explain to candidate that they do not have to finish all questions and you might interrupt them abruptly. |
| ❌ | Allow the candidate to spend too long introducing themselves. |
### Upon delivering the question
| | Things |
| --- | --- |
| ✅ | Ask if the candidate has seen the question before. |
| ✅ | Give a small example for the question and the desired output. |
| ✅ | Get the candidate to talk through the solution first before diving into coding. |
| ✅ | Provide hints where appropriate. |
| ✅ | If candidate is still stuck after providing hints, provide the solution and move to coding so that you can get coding signals. |
### During coding
| | Things |
| --- | --- |
| ✅ | If whiteboard interview, stand alongside candidate but also giving them space, instead of being distant, e.g seated down. |
| ✅ | Take note of all the positive and negative signals. |
| ❌ | Check the time in an overly-obvious manner. |
### After coding
| | Things |
| --- | --- |
| ✅ | Ask for candidate to provide test cases and run through the code with them. |
| ✅ | Point out edge cases candidate missed and ask the candidate to address them. |
