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Alex Roetter

Alex Roetter

Engineer, investor, aviator, and climate tech founder

San Francisco, California
vcsheet
Joined January 2025
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Network

16.3K connections
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AI/ML Founders
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Summary

Alex Roetter is a seasoned engineering leader with a foundational background at Google, where he was an early engineer for syndicated ads and a member of the founding team for AdSense. He later brought this expertise to Twitter, where he served as SVP of Engineering, significantly scaling the company's revenue from near zero to $2.5 billion annually and developing key advertising platforms like APEX. moxxie+3
Transitioning from executive roles in major tech companies, Alex has become a prominent investor and founder in the venture capital and climate technology sectors. As Managing Director & General Partner at Moxxie Ventures, he invests in and advises early to late-stage companies. Concurrently, he founded Terraset, a nonprofit leveraging philanthropic capital to accelerate high-quality carbon removal solutions, demonstrating his commitment to climate impact. moxxie+2
Beyond his professional endeavors, Alex is an accomplished aviator, holding a pilot's license for 15 years. He actively volunteers for Angel Flight West, using his flying skills to transport children with challenging health conditions to necessary medical facilities, showcasing a blend of his technical passion with a strong commitment to community service. entrepreneursforimpact+1

Work

Education

Writing

Testimony of Alex Roetter, Former Senior Vice President of Engineering, Twitter, Before the U.S. Senate Committee on Homeland Security and Governmental Affairs

September 14, 2022

Written testimony detailing his experience and insights, likely pertaining to technology, social media, or engineering leadership.

Favicon imagehsgac.senate.gov

Alex's Newsletter

A Substack publication focused on software, technology, and seed investing, providing insights and perspectives from his extensive experience in these fields.

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The case for bolder climate philanthropy

An article discussing the urgent need for increased philanthropic capital to support the scaling of permanent, high-quality carbon removal solutions to achieve net-zero emissions.

Favicon imageterraset.substack.com

Hobbies

Alex is an experienced pilot who has been flying for 15 years, engaging in Angel Flight West, a charitable organization that transports individuals with medical needs. entrepreneursforimpact

Notes

HLHaley Lyonssaid they've seen
ARAlex Roetter
consistently add value to startups during their seed or Series A rounds.

Sep 30, 2025