The tech round is 10 MS SQL questions - because that's what node engineers use, right?! These are Googlable, as they would like be in real life, so it's not too bad. The worst bit is the GraphQL questions. Codility is pretty painful. It has no obvious way to debug, and you don't get details of the unit tests that are not passing. Most of the issues were to do with validation - it was checking this by asserting 1 error came back. The API was giving 2 errors, so this failed. Without knowing what the errors were, it was pretty hard to debug.