I worked at Tellabs (More than 10 years)
The CEO was also the founder of the company. Best upper management.
After Tellabs merged with Coriant, it was not the same.
Not hard. Average interview. Talkabout your resume mostly. So, brush up on your resume and you will be good hopefully. Be prepared to know what you are talking about. Also, any challenges you faced in your job and how you overcame them.