Rational

AI Employees for In-House Enterprise Accounting

YC Summer 2026Artificial IntelligenceEnterprise

About Rational

Rational builds AI employees for in-house enterprise accounting teams. Enterprises process high volumes of complex, multinational transactions that require broad expertise in international tax and accounting. Powered by the most accurate tax model in the world, we save teams enormous time on tax and close work while also eliminating unnecessary audit costs.

Founders

  • Jibril Moinuddin

    Founder

    CEO at Rational. Previously founded STEMplicity Education. Dropped out of University of Michigan.

    LinkedIn ↗X ↗

  • Christ Xu

    Founder

    CTO at Rational. Previously exited for $400K and youngest Senior SWE at Tencent. Jane Street ML Engineer and OpenAI SWE intern. 2x IOI Camp, IMO Camp, published algorithm researcher.

    LinkedIn ↗

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