I worked at Tellabs full-time (More than a year)
I worked at the Santa Clara office. The upper management did not have a clue, but the local team was managed very well.
Upper management is based in Naperville and did not understand how to operate in the Silicon Valley
Advice to Management
Too late now, company has been sold to private equity. Could have done so much more. Some great products, great engineers.
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.