Internal on-call handoff dashboard

My team's on-call handoffs were a mess. The outgoing engineer would paste a Slack summary, but active incidents, recent deploys, and muted alerts all lived in different places, so people missed context. My intern project was a small internal dashboard that pulled those three things into one page. I built the frontend in React and a thin Node/Express backend that called our internal incident API and the deploy service, then cached responses in Redis with a 60-second TTL so we didn't hammer those APIs on every refresh. The data model was basically one 'handoff' view assembled from three sources at request time; I deliberately didn't store it because the source-of-truth systems already did. The hardest part wasn't the code, it was figuring out what on-call people actually looked at first, so I shadowed two handoffs and cut the page down to the four things they named. It shipped to my team of about nine engineers by the end of the internship and two other teams asked to try it. I kept it read-only on purpose to avoid becoming a system people depended on for writes.