Fortinet

Large Enterprises

Fortinet is a global cybersecurity company that develops and sells security solutions including firewalls, endpoint protection, and secure networking products. It is best known for its FortiGate line of next-generation firewalls and its integrated Security Fabric platform.There was a formatting placeholder here; the correct category is Large Enterprises.

3 interview notes · updated Jul 2026

Fortinet·Software Engineer·Technical Phone Screen

May 2026

Fortinet software engineer interview, got hit with a linked list reversal problem and had to do both iterative and recursive versions. Pretty standard stuff but the dual-implementation requirement tripped me up a bit under pressure.

Reverse a singly linked list and return the new head. Implement both an iterative solution using O(1) extra space and a recursive solution.

“The iterative part was fine, three pointers, done.”

View Post

Fortinet·Software Engineer·Technical Phone Screen

May 2026

Had a technical phone screen for a software engineer role at Fortinet. One algorithm question, pretty focused, no fluff.

Given a sorted array that has been rotated at some unknown pivot point, find the minimum element in O(log n) time.

“Classic binary search variant.”

View Post

Fortinet·Software Engineer·Technical Phone Screen

Apr 2026

Interviewed for a software engineering role at Fortinet and got a pretty standard linked list traversal problem. Nothing too wild, but it's the kind of question where you can overthink it if you're not careful.

Given the head of a singly linked list of integers, traverse the list and return the minimum value. The solution must run in O(n) time and use O(1) extra space.

“Pretty straightforward once you just start writing.”

View Post