There are two interviews overall. The first one is usually with one person and the second one with two persons. Both of which are easy going interviews I'd say. They're more interested in the way you'll potentially be handling things in different hypothetical yet realistic situations within the organization.

2 rounds, with assessment, it was not the longest process and everything went pretty smoothly. Just watch out for the assessment test, do some practice online. There are multiple sources for practicing similar assessments.