First, you'll have to take a paper-based test, mainly technical questions. You'll be asked to write in C/C++.
Then, based on your skill test result, there will be three or more 1:1 interviews.
Describe your last project and your role in it.
The following metrics were computed from 27 interview experiences for the Fortinet Software Developer role.
Fortinet's interview process for their Software Developer roles is extremely selective, failing the vast majority of engineers.
Candidates reported having mixed feelings for Fortinet's Software Developer interview process.