X loses top engineer and techops lead – Breaking News & Latest Updates 2026
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X loses top engineer and techops lead.

Mark Kalman, X’s engineering lead of media, and his second-in-command, Melissa Merencillo, resigned today. They announced their departures in a company Slack channel on the day stocks vest at X; Merencillo told The Verge that the timing had no bearing on their decision.

This is a big loss for X, a source tells me. Kalman is the main source of knowledge for all things X media infrastructure, and more important than that, he’s good at “handling” Elon Musk.

Update: added comment from Merencillo.

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