Lutron Electronics Project Applications Software Engineer interview questions

Picked up from career fair and then one hour video interview. 30 mins go over resume, 30 mins technical questions. Tech questions is easy leetcode level. You can ask questions about the company and it is overall a smooth process

Had a 1st round interview for 1 hour with simple coding questions. A week later heard back for next round for 3 hours. Had to create a UI+database design for an app and a 1.5 hour role playing which felt very much like a customer support job interview. I though this was the final round since the interview process was longer than other companies. I get an invite for another 3 hour long round with 3 interviews. Had brain teaser type problems that test my logic and 2 more behavioral rounds. I was able to connect well with my interviewers except the last one who didn't have my resume and seemed to be totally disinterested in what I was saying. Got a rejection 1 week later. Honestly, I wish they let me know sooner since spending 7 hours interviewing and not get any feedback on what I could improve on felt very discouraging.