San Francisco — The way Tina Huang tells it, the path to her resignation from Twitter was a Kafkaesque experience. She said she was denied a promotion, led to believe her coding skills were inferior, asked to take a leave of absence and scolded for taking that leave. Two years ago, she sued, contending that the company systematically thwarted the advancement of women engineers. Since then, she has been gathering data on gender and pay for her peers there and says she can prove Twitter stacks the deck. By January, she plans to ask a state judge for permission to represent 133 female engineers at Twitter, in what would be the first group case of its kind in Silicon Valley if certified. Huang said in an interview the time was ripe to do something that had never been done before: pry open entrenched, male-dominated barriers in the technology sector. One catalyst, she said, was a February blog post by former Uber Technologies engineer Susan Fowler, which detailed a predatory work environ...

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