Give examples of projects you have worked on, not just ones you tried once.

Situation: I was part of a data analytics team at a retail company. Task: Build a real‑time sales dashboard. Action: I designed a Spark streaming pipeline that ingested clickstream data, performed windowed aggregations, and stored results in a Cassandra cluster. I also wrote unit tests and set up CI/CD with Jenkins. Result: The dashboard reduced reporting latency from 30 minutes to 5 minutes, and the team could identify inventory shortages within hours, improving stock turnover by 12%.