Next level is project engineer L2. Heavy focus on experience for senior technical staff
Not sure, just that I know rotations into different disciplines is achievable due to limited resourcing across the different departments.
I believe as you work hard and show that you are capable of handling responsibility and a large workload you can progress through to roles that compliment your strengths.
I am not 100% sure how easy/difficult this is as I have not gotten up to this stage of my career.
You need to perform well and work hard. When you reach a certain level you become a shareholder in the company.