I had a negative experience interviewing with Abnormal. I received an offer (compensation in a tool via Pave which is essentially a verbal offer). Unfortunately, during the negotiation process, my offer was rescinded because they decided to go with another candidate. Do not negotiate with this company unless you have a written offer!
The process itself was: Technical phone screen (coding), then hiring manager behavioral screen, then onsite - past project review, system design, frontend interview, and a code review interview.