Demonstrate project impact and teach something

In a hiring-manager or behavioral interview:

1. Pick one recent project and explain:

• the problem and why it mattered,
• your role and scope,
• key design decisions and trade-offs,
• measurable impact (latency/cost/reliability/revenue), and
• what you would do differently.

1. Then, teach the interviewer one technical thing you learned recently (concept, tool, pattern). The explanation should be clear, structured, and adapted to the interviewer’s context.

How would you structure and deliver strong answers to both parts?