Received a call from a technical recruiter after applying for a SE role.

I was told that I did not have enough experience for that role, but I did for the QA role.

The process after that is as follows:

1. 15 min HR interview (questions about what I know and a brief description of the role)
2. Call back stating that I would be having a phone interview with members of the hiring team.
3. 30 min call with 3 team members (More in-depth questions about what I know and experience I have)
4. A 1hr Hackerrank exam to test my QA skills. (Very easy)
5. Call back from HR to set up in-person interview
6. In-person interview was with 5 team members with multiple levels of experience. The interview ended up lasting 1hr15min. Questions were based on what I know and describing my current work project along with my senior design project. The interview was stressful due to having to go in-depth on all aspects of what I know and having to prove it at times.
7. Call from HR a week later stating that I was accepted for the role.
8. Received the official offer letter a week later (Background check)
9. Instructed by HR to put 2 weeks' notice in once my offer letter was signed.

Explain current work project and how I designed and tested it.