How to prevent over-engineering?

The best way to prevent over-engineering is to turn your engineers into true product engineers.

• Involve them in the day-to-day business, explaining the why after each initiative, and linking it with the metrics that matter for the organization and its vision. 
• Bring them closer to the users, inviting them to interviews and discovery sessions with them. You want your team to empathize intimately with your user’s problems, so they can quickly discard any engineering effort that won’t solve them as efficiently as possible.