This recruiter is highly disorganized and careless. She does not even check her email regularly, and God knows how many good candidates are not getting hired because of her incompetence.

She did an extremely poor job of communicating and coordinating. The team needs to seriously evaluate its recruitment staff. The recruiter's attitude is very similar to the attitude of Netflix HR (see Netflix reviews if you don't know what I am talking about).

The interview process itself is pretty standard:

• Phone call with the recruiter
• Technical phone interview
• Onsite interview (if the technical interview goes well)

The technical part was a good experience. The negative rating is for the sloppy recruiter.

Read up on data structures and algorithms.

Practice a lot on LeetCode.