I found the job posting on indeed.com and applied online at the company's website. I got an email about two days later to schedule a phone interview with an applications engineer. The phone interview went pretty ok. It was mostly technical stuff on computational fluid mechanics, turbulence modeling, finite element programing, open source software and my research work. I felt the interview went pretty ok and I was told to wait for their response in a couple of days. About half and hour later, I got a call from the hiring manager inviting me for an onsite interview at Comsol office in Burlington MA. The onsite interview lasted about 3 hours. I gave a presentation about my research. I got a number of technical questions during my presentation especially with regards to mathematical formulation of my research problem and the numerical implementation. I also got a lot of tech questions on fundamental numerics such as accuracy of Gudonov methods around a shock wave which to me was kinda odd considering how long ago I did all that stuff. At some point, I had to write out the steps for implementing the PISO algorithm on a white board...more like a thesis defense! I had other 1:1 interviews with different applications engineers, the hiring manager and more senior personnel and it was basically tech stuff particularly relating to my research background.