There was an HR screening, then after this a coding assessment in Python to complete on my own time (around 3-4 questions if I remember correctly), and then interview with the pipeline supervisors

Do not waste your time. I applied online. Then was contacted by a recruiter for a phone screen. After the phone screen I was sent a technical test. After the technical test I had two more interviews, one with two pipeline director followed by an interview with the Production Technology Department Manager. These interview were pretty standard. The worst part about this entire process is that I had to wait over a month for my rejection.