After initial screening application, which were coding questions, a phone interview was scheduled. Upon the completion of a successful phone interview, they flew me out to Chicago and paid for hotel expenses. The on-sight interview process took almost an entire day (10am - 4pm), and consisted of three parts: coding interview with two software engineers, a casual lunch with two other software engineers, and a high level design interview with two final software engineers.

Recreate addition and multiplication operators from scratch