To become a Product Manager at MongoDB, one must first understand that it's not just about telling engineers what to work on, but rather helping the team make informed decisions to solve customer problems while minimizing resources. The role involves analyzing customer pain points, prioritizing them, and facilitating brainstorming sessions with the engineering team to come up with solutions. Once a solution is built, the Product Manager must think about how to commercialize it and drive users to engage with it. Ultimately, the goal is to maximize impact with limited resources while minimizing barriers to efficiency. The day-to-day involves making joint decisions with the team, analyzing data, and facilitating discussions to gain consensus on customer problems and solutions.