From the perspective of a Product Manager, it's amazing how different PM interviews can be between organizations.
While there are a fair share of rigorous hiring processes, what catches my surprise is how many startups simply do too little to vet a PM. Those who are proud of their work would much prefer a way to display this than an easy offer.
Here's my 2 cents:
Let Them Speak
Most of the intangibles that come with being a PM are often revealed when a candidate speaks to their own accomplishments. When given the steering wheel, which aspects of their products do they speak to?
Having a PM describe their own successes will reveal what they perceive goes into making a successful product:
Speaking to the challenges that were presented and the features they proposed to fix them are indicative of strategic thinkers.
Detailing the struggles of a team or organization