FullSeam
YC Winter 2026 ActiveAI agents for corporate accounting teams
https://fullseam.com ↗Thesis fit
Good fit
Within your typical scope; diligence still required.
In your usual scope
Idea match
Moderate
How close the company’s idea is to your thesis statement
Sector
agents, ai
Overlap with sectors you care about
Geography
Unknown
Location unknown — scores 0
Your thesis: “We back exceptional technical founders building AI-first products and infrastructure, deploying $100K checks within 24 hours.”
Founder ↑ improving
Traction → stable
Idea vs market ↓ declining
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Correct facts used on the next screening or memo.
People
Geoff Segal
career mapped
Geoff is the co-founder of FullSeam (W26), the AI employee for finance and accounting teams.
He previously co-founded TaxProper (
23.9
medium confidence
Thomas Dowling
career mapped
Tom is the co-founder of FullSeam (W26). FullSeam automates work for corporate accounting teams.
He previously co-founded TaxPro
31.9
medium confidence