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Rational launch: what they're building and where to launch next

What they're building

AI Employees for In-House Enterprise Accounting

Batch
Y Combinator Summer 2026
Industry
B2B
Team size
2
Based
San Francisco, CA, USA

Founders

rational.to ↗

See their funding details ↗

Rational on the record

What they shipped

  • From its YC profile: 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. (source)
  • Its own site describes it as: "Rational offers AI employees for AP, bookkeeping, reconciliations, document chasing, expense review, and close." (source)

Who is behind it

  • Jibril Moinuddin, Founder/CEO: CEO at Rational. Previously founding engineer at Buckeye AI, TrueFoundry. Founded STEMplicity Education. Dropped out of University of Michigan. Non-Trivial Fellow. (source)
  • Christ Xu, Founder/CTO: CTO at Rational. Youngest Tencent Senior SWE, OpenAI SWE. 2x IOI Camp, IMO Camp, published algo researcher. (source)
  • 4 open roles listed on its YC jobs page when the profile was read (2026-09-06). (source)

Timeline

  1. 2026: founded, per its YC profile. (source)

Other B2B software launches on FoxPlug

  • Understudy Labs: Self-optimizing neocloud that cuts LLM bills by 80%
  • Vendo: Let your users build their own features on top of your product
  • Verdict Machine: AI cybersecurity for financial institutions' digital assets

Where else to launch Rational

  • Product Hunt ↗
    Self-promotion allowedFree
  • Indie Hackers Forum ↗
    Self-promotion allowed
    Audience: IndieHackers; bootstrapped solo founders sharing revenue and behind-the-scenes
  • Hacker News (Show HN) ↗
    Self-promotion allowed, within the community's rules
    Audience: Hacker News readers; engineers, technical founders, infra-curious people
  • Demand Curve ↗
    Self-promotion allowed, within the community's rules
    Audience: Slack community; tight-knit, pseudo-private peer group
  • No Code Founders ↗
    Self-promotion allowed, within the community's rules
    Audience: Slack community; tight-knit, pseudo-private peer group
  • OnlineGeniuses ↗
    Self-promotion allowed, within the community's rules
    Audience: Slack community; tight-knit, pseudo-private peer group
  • Product Makers ↗
    Self-promotion allowed, within the community's rules
    Audience: Slack community; tight-knit, pseudo-private peer group
  • ProductLed ↗
    Self-promotion allowed, within the community's rules
    Audience: Slack community; tight-knit, pseudo-private peer group

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Featured on FoxPlug: Rational