An early Twitter engineer, she established her technical excellence as an Android engineer over the years. She left Twitter to join the teams at Secret and Periscope, the latter which was acquired by Twitter in 2015. In addition to her work at Twitter, she is an angel investor of tech startups – making a commitment last year to only invest in women CEOs. Hear Sara Haider speak about the diversity gap on ReCode video here.. Follow her on Twitter @Pandemona.