Describe Over-Engineering and UX Wins

After a project deep dive, the interviewer asked two behavioral questions:

1. Describe a time when you designed or implemented something that became more complex than necessary. Why did it become over-engineered, how did you realize it, and what did you change afterward?
2. Describe something you built or improved that had a major positive impact on user experience. What user problem did you identify, what actions did you take, and how did you measure the improvement?

Use concrete examples, explain trade-offs, and include measurable outcomes where possible.