CoderPad Interview: How the Pad Works and How to Prepare

CoderPad interview guide: how the pad, languages, Drawing Mode, playback and AI Assist work, and how to practice in the sandbox.

A CoderPad interview tends to worry candidates for a reason that has little to do with algorithms, which is that they have never seen the editor they will be judged in. The invitation is usually a single link, and it says nothing about whether the code will actually run, which languages are available or what the interviewer can see afterwards.

We wrote this for engineers who have a live coding round or a take-home test on CoderPad coming up and want to know the environment before the day. It covers what a live pad is, how the editor, languages and Drawing Mode work, what the take-home formats look like, what the interviewer can replay, how AI Assist fits in and how to practice in the sandbox. We make Verve AI, an interview copilot for live interviews, and what we say about CoderPad comes from its own documentation as it stood in October 2026.

The short version is that the pad is a shared editor that runs real code, and almost everything in it can be tried beforehand in CoderPad's sandbox.

What is a CoderPad interview?

CoderPad's live product, which it calls Interview, is a platform for technical phone screens and remote interviews in the browser. You and the interviewer work in the same pad at the same time, so each of you sees the other's typing as it happens.

Joining takes very little, and CoderPad's guide for candidates says you receive a link before the interview, open it at the scheduled time and enter your name. The interviewer has to make the pad public first, so opening the link early shows a waiting room. The conversation can happen inside the pad, through a Start Call button that opens a video or audio call powered by Zoom, or on whatever meeting tool the company already uses.

Each company writes its own questions, which CoderPad gives as the reason there are no practice questions on its site.

How does the pad work?

A pad is laid out like a simple development environment. You write code in the left pane, press Run, and read the output in the right pane, which for some languages also offers an interactive prompt for trying expressions. A Reset button clears the output and leaves your code alone.

Several features are worth knowing about before you need them.

• The Settings menu lets you change tab size, font size and color theme, switch on bracket auto-closing and use Vim or Emacs key bindings, and your choices do not affect the interviewer's view.
• Autocomplete is available for many languages and can be turned off from the same menu.
• Long instructions can be opened in a separate window.
• Focus Time gives you five minutes of quiet, unobserved work, during which the interviewer's screen is blurred and their audio and video are off.

CoderPad's own advice for the moment you get stuck is practical: run the code and use the output for debugging.

Which languages does CoderPad support?

CoderPad supports most mainstream programming languages, and its languages page also lists front-end frameworks such as React, Angular and Vue, back-end frameworks such as Django, Rails and Spring, and databases including MySQL and PostgreSQL. You add a language from the Languages button on the left of the pad, and hovering over a language shows its version and the packages available.

A question may arrive in a default language, and some questions let you switch to one you prefer. The documented exception is a question with its own data, because when the interviewer has attached a custom database to a question, changing language removes your access to that database, so stay in the language you were given.

What is Drawing Mode?

Drawing Mode is a shared whiteboard inside the pad, built on Excalidraw, which interviewers use for system design and architecture questions. Either participant can open or close it, and each person controls only their own window, while the drawing itself stays synced for everyone in the pad.

The whiteboard has shapes, text and a shape library, and pressing the question mark key lists its keyboard shortcuts. CoderPad advises interviewers to warn candidates when a drawing session is planned, so ask your recruiter whether the round includes system design.

What are CoderPad's take-home formats?

CoderPad has two formats that you complete alone. The first is a take-home project inside the same pad environment. The link shows the instructions and the time allowed, the clock starts when you enter, and your code is submitted automatically if time runs out before you press Submit.

The second is CoderPad Screen, a separate testing product. Its preparation guide explains that the invitation link opens a tutorial you can take as many times as you need, and that the invitation shows the number of questions and the maximum time. A Screen test can mix several kinds of question.

• Multiple choice and short text questions test language knowledge and allow only seconds per answer.
• Programming questions give you several minutes or more, with starter code to complete.
• Project questions provide a full VS Code environment for work on a realistic codebase.
• Audio and video questions ask you to record a spoken answer to a written prompt.

For programming questions in Screen, CoderPad says you may use resources such as Stack Overflow or Google, and may not have another person solve the question. A question that times out is submitted as it stands and can still earn points. Your recruiter decides whether to share your score with you.

What can the interviewer see and replay?

During a live interview the platform records every keystroke of every participant. Once the interviewer ends the session, the pad switches to Playback Mode, where the whole interview can be replayed with a separate track for each person showing their edits and code runs. Playback covers the code in the editor pane, and commands typed in the shell are not shown.

The drawing is kept too, as a tab showing its final state. Where the company uses CoderPad's AI Notetaker, each participant is asked to opt in, and CoderPad says only a transcript is stored and not the audio or video. Playback also marks pasted code and moments when you left the editor, which we cover in Can HackerRank, CodeSignal or CoderPad detect AI?.

What is AI Assist?

AI Assist is a tab in the pad that gives you and the interviewer access to large language models during the interview. The interviewer can switch it on or off for each pad. It has an Ask mode that answers questions without touching the code, an Edit mode that can change the code and file structure, and a Plan mode that outlines an approach step by step.

Two things about it matter to a candidate. CoderPad tells candidates to check with the interviewer what counts as acceptable use, because having the tab does not mean every use is welcome. Every prompt and every response is also saved for review in playback, so the way you use it becomes part of what is assessed.

How do you practice in the CoderPad sandbox?

The sandbox is a practice pad that opens in the browser, and CoderPad describes it as nearly identical to a real session without the multi-user functions, AI Assist and the ability to save. A short routine makes good use of it.

1. Open the sandbox, add the language you plan to use, and run a small program.
2. Set the editor up like your own, including key bindings, tab size and autocomplete.
3. Open the language information to check the version and which libraries are installed.
4. Solve one timed problem while talking through it aloud, as you will in the interview.

The sandbox has no interviewer, and conversation is half of a live round. Verve AI's mock interviews add that part, as a spoken interview with an AI interviewer followed by a report. The neighbouring platform is covered in our guide to the HackerRank interview and test.

How does Verve AI help with a live coding interview?

Interviewers in a shared editor rarely stop at the first working answer, and they go on to ask why you chose the approach and what its complexity is. Verve AI's Coding Copilot captures the problem from the screen with a hotkey and returns an approach, code and an explanation. That capture shares one conversation context with the live audio, so help with a spoken follow-up is about the same solution, offered as prompts for answers given in your own words.

When the round is held over Zoom, Microsoft Teams or Google Meet with the pad in a browser tab, Stealth Mode in the Verve AI desktop app runs outside the screen-share layer. It is guaranteed invisible when you share a window or tab on any meeting platform, and when you share your entire screen in the Zoom or Teams desktop apps. The coding interview copilot page shows the capture and the audio working together, and our article on what a meeting host can see on Zoom, Teams or Google Meet covers the video call itself.

Every employer sets its own rules on outside help, so read the instructions you are sent and ask the interviewer when unsure. You can start on Verve AI's free plan, which includes three live sessions and five mock interviews.

FAQ

Can you run code in a CoderPad interview?

Yes, code written in a CoderPad pad can be executed during the session. You write in the left pane, press Run, and see the output in the right pane, and CoderPad encourages candidates to run code and use the output for debugging.

What is the CoderPad sandbox?

The CoderPad sandbox is a practice pad that candidates can open in a browser before an interview. CoderPad describes it as nearly identical to a real session, without multi-user functions, AI Assist or saving, and says a tab is deleted after one hour of inactivity.

Can the interviewer replay your session on CoderPad?

CoderPad records every keystroke in a pad, and the interviewer can replay the whole session in Playback Mode after ending it. Playback shows a separate track for each participant with their edits and code runs, and it can be shared with other members of the hiring team.

Can you choose your own language on CoderPad?

CoderPad lets you add a language from the Languages button, and some questions allow you to switch from the default language. Questions with a custom database attached are the exception, because switching language removes access to that database.

Does CoderPad allow AI during an interview?

CoderPad includes AI Assist, which the interviewer can switch on or off for each pad. CoderPad tells candidates to ask the interviewer what use is acceptable, and all prompts and responses are saved for the interviewer to review in playback.