Ask HN: How to prepare for a follow up interview to a technical assignement?

Any advice or links to old discussion about how i can prepare for a follow up technical interview where i will be discussing my solution to a technical assignment ? the job is for a backend engineer.

what i have noted so far are:

    read the documentation of the used stack.
    take notes about what can be improved.
    try to improve the solution.
    try to anticipate solutions to some problems they may ask, for example what if we need to scale this to double or triple the users...
    prepare some questions about their stack.