Cezar Rachieru in

Cezar Rachieru

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Co-Founder & Operating Partner at Startup Theory Lab
📍 San Francisco, California, United States

Cezar is a versatile C-suite leader specializing in scaling startups from seed to IPO with a focus on sustainable growth and successful exits. He is currently a Co-Founder at the AI incubator Startup Theory Lab and is pursuing an Advanced Management Program at Harvard Business School Executive Education.

He is an active participant in the startup ecosystem, attending events like the Stripe Sessions and All-in Summit to connect with founders and investors. Cezar is engaged with the NYC startup scene and advises VC-funded companies on growth and operational efficiency, leveraging his experience from Y Combinators W20 batch.

Unique fact: Cezar describes ambiguity as his "middle name, " thriving in multi-faceted C-suite roles from COO to CMO and CPO to drive startup success.

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Experience
4 Years
Current Role
Co-Founder & Operating Partner
Job Level
Leadership
Location
San Francisco, California, United States
Personality Overview

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Communication Style
Decision Approach
Work Preference

Behavioral traits and communication patterns that shape how this person evaluates opportunities, builds trust, and makes decisions in professional settings.

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Priorities

Topics Cezar cares about

Startup Scaling
His career focuses on setting clear roadmaps for scaling, fundraising, and achieving product-market fit for early-stage and growth-stage companies.
AI Business Integration
Co-founded an AI incubator, Startup Theory Lab, and previously implemented AI pricing strategies at Duffl to unlock customer value.
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Career

Work history

1-2025
Co-Founder & Operating Partner
Startup Theory Lab
1-2025
Family Office Advisor | Capital Allocation - Startups
Family Office
4-2020 - 1-2025
Fractional COO | Leadership Team | Board Advisor | Successful Exit (Inven 2025)
FINX Consulting Services
12-2022 - 5-2024
Vice President Strategy and Operations | Leadership Team | YC W20 | Exit 2024
Duffl
12-2021 - 12-2022
Director of Operations | Board Advisor
Duffl
In the press

Media appearances

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Education
Education details unavailable
Y Combinator
Advanced Management Program - Ongoing
Harvard Business School Executive Education
Social presence
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Behavioral profile

DISC profile (public)

DISC behavioral profile

Dominance, influence, steadiness, and calculativeness scores with guidance on how this person prefers to communicate and decide.

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