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Tomas Barreto

Tomas Barreto

Operating Partner, Co-Founder & CTO, Engineering Leader, Angel Investor

tomasrb
San Francisco, California
Joined February 2026

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Summary

Tomas Barreto is an accomplished engineering leader and entrepreneur with a strong track record of scaling engineering organizations. He played a crucial role in building Box's engineering team from its early stages through its IPO, and later led the engineering, product, and design team at Checkr during a period of hyper-growth. His experience spans various stages of company development, from early startup to established enterprise. kleinerperkins+2
As a co-founder and CTO of Okay, Tomas demonstrated his entrepreneurial spirit by building an engineering effectiveness startup that was successfully acquired by Stripe. This venture showcased his ability to identify a market need, develop innovative software solutions, and achieve a successful exit. techcrunch+2
Beyond his direct operational roles, Tomas is actively involved in the startup ecosystem as an advisor and angel investor. He leverages his extensive experience to mentor CTOs and guide emerging companies in areas such as hiring top talent and improving engineering velocity. kleinerperkins+1
Tomas is also an inventor, holding multiple patents related to cloud-based collaboration services and web-based collaboration environments. These patents highlight his technical depth and contribution to software innovation, particularly during his tenure at Box. justia+1
He is a proponent of biohacking, applying principles of self-experimentation and optimization to his personal health and professional career. He believes this approach has contributed to his resilience and capacity to manage increasing responsibilities. firstround+1

Work

Education

Hobbies

Tomas is passionate about biohacking and experiments with various techniques, including sequencing his genome and using currents through his body, to enhance health and longevity. firstround+1

Notes

CGChett Garciasaid that if they were raising their next round,
TBTomas Barreto
would be among their top picks from tier 1 venture firms.

Jan 20, 2026