Phone screen with general questions about work history and career goals Technical screen with detailed questions about experience. Coding interview that's algorithmic instead of plain old selenium test 4-hr on site to evaluate behavior and experience

Phone screen with recruiter than 4+ hour long interviews with different teams and different people. 30 minutes of whiteboarding and 30 minutes of phone conversations. I was offered the position but then right before I signed the agreement the recruiter told me the gave the position to an internal hire? It was never discussed and extremely unprofessional. I still am confused by why they decided to stick to a poor experience instead of making it right.