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CJ Desai, formerly CEO of MongoDB, is joining Meta to head a new enterprise platform business aimed at making it easier for developers to use Meta's products. MongoDB's stock fell more than 20% following the announcement, reflecting investor concerns about leadership continuity and the company's strategic direction. The departure highlights ongoing executive mobility in the technology sector, particularly as major platforms compete for talent in building developer-facing infrastructure and enterprise offerings. The sharp stock decline underscores how CEO transitions can trigger market reassessment of company valuations and growth prospects.