Tech Moves: Microsoft hires activist fired by Amazon; ex-Sprint CEO leaves F5 Networks board April 2, 2021 at 11:09 am Underwritten by Tech Moves covers notable hires, promotions and personnel changes in the Pacific NW tech community. Submissions: tips@geekwire.com Maren Costa. (Elizabeth Munsson Photo) — Maren Costa, one of two former leaders of the Amazon Employees for Climate Justice group who was fired by Amazon last April, is now a principal lead designer at Microsoft. Costa first joined Amazon in 2002 and was an employee for more than 15 years, working as a UX designer on the retail website, Amazon Go, and Alexa Shopping.