[bayarearefugee]

My hotter take: All 3 of the engineer, PM and designer will all assume the other 2 are optional, in reality all 3 and the entire company they work for will be optional in most cases.

[operatingthetan]

You just need one of them. It's probably the engineer.

[badgersnake]

Good PMs are not optional. Most PMs are.

[lelanthran]

How are you defining optional?

Companies without any product managers, much less good ones, are putting out profitable products all the time.