Meta follow-up coding interview post onsite

A follow-up is requested when a candidate is borderline.

If you interviewed for E6, this is somewhat common (still rare overall but common relative to other levels). This is because E6 hires are very valuable and Meta doesn't want to let go of a potentially good E6 if there's a chance.

The most common case for follow-up E6 interviews is another DSA round. I literally presided over this exact case before and was the one who triggered the follow-up. It is very common for E6s to have rusty coding skills as many Staff+ engineers (especially outside of FAANG) are more of a traditional "architect" role that Meta is allergic too (making high-level decisions but not coding).

Luckily for you, I just released my new DSA course! If it is a DSA round and you follow all the advice from the course (you'll need it as the E6 bar is super high), you'll surely ace the interview: [Course] Master The Data Structures And Algorithms Interview

However, make extra sure what round it is first. It might be some form of system design (not likely if they said it was coding in particular, but I would check anyways).