Still reeling from charges of sexism and sexual harassment by a former software engineer, Uber Technologies Inc. now faces a lawsuit from three engineers who allege the ride-hailing firm systematically underpaid women and minorities.

The suit, filed in California Superior Court in San Francisco, adds to the litany of legal and public relations woes facing Uber and is yet another distraction for new Chief Executive Dara Khosrowshahi, who is barely two months into the job.

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