What a pair programming interview is, what interviewers are really grading, and how to practice for one with a friend on a shared coding pad so collaboration feels natural on the day.
How to run mock coding interviews that actually help: setting up a realistic session, a repeatable structure to follow every time, what to practice beyond the code, and how to get feedback you can act on.
ViewHow to run a mock interview with a friend that actually works: pick a partner who pushes you, swap interviewer roles, time each round, and review the playback.
ViewHow Codex Interview's real-time collaboration works: the desktop app, the shared coding pad, and why room-scoped screen sharing and session playback exist.
ViewA pair programming interview asks you to build something with the interviewer rather than perform in front of them. You share a live editor, you write real code that runs, and the interviewer often plays a teammate — asking questions, suggesting directions, sometimes typing alongside you. It's less "solve this puzzle on a whiteboard" and more "show me what you're like to work with."
That shift catches people off guard. You can be great at solo algorithm problems and still stumble here, because the thing being tested is collaboration under mild pressure. The good news: it's very practiceable, and the best way to practice is with a friend on the same kind of shared pad you'll use in the real thing.
In a pair programming round you and the interviewer work in a shared coding environment on a problem that's usually closer to real work than a classic LeetCode puzzle — extend a small codebase, fix a bug, add a feature, or build up a solution in stages. Key differences from a whiteboard interview:
Companies increasingly favor this format because it looks like the job. Even Meta has moved part of its loop toward a collaborative, run-your-code round in a shared pad rather than pure write-it-blind whiteboarding.
Because you're "working together," it's easy to forget you're still being assessed. Interviewers in a pair round are watching for:
Notice how few of these are about raw algorithm speed. That's why grinding problems alone doesn't fully prepare you — the format rewards behaviors you can only rehearse with another person in the loop.
A few things move the needle most:
The most effective preparation for a collaborative interview is a collaborative practice session. Working through problems with a friend on a shared pad — following real interview time limits — makes the format feel routine long before the day. If you're new to running these, start with this playbook for a mock interview with a friend.
Here's a setup that mirrors the real thing:
This is precisely what Codex Interview is built for. You open a live coding pad in a desktop app, send an invite link, and a friend joins from any browser with no account needed. Every keystroke and message syncs instantly, you can run JavaScript, Python, Java, C++, or Go right in the pad, and session playback lets you replay the whole thing afterward to see where the collaboration broke down. It runs beside Zoom, Meet, or Teams, so a remote practice session looks just like a remote interview. If you want the details, here's how Codex Interview works.
Keep sessions honest by giving them the same shape as a real round:
Swap roles and repeat. Two focused rounds in an hour, with real debriefs, beats an afternoon of silent solo grinding for this format. It's the same loop covered in our guide to running a good mock coding interview — pairing just makes it collaborative from the start.
A pair programming interview rewards exactly the things a good engineer does every day: communicate, collaborate, write code someone else can read, and check that it works. Those are habits, and habits form through repetition with a partner — not through solo problem grinding.
Line up a friend or mentor, get on a real shared pad, run a few timed rounds with honest debriefs, and the collaborative format stops being a curveball. You'll walk into the interview already knowing what it feels like.
Ready to practice? Open your coding interview assistant, invite a teammate, and run your first pair session today.