# Rational

[Rational on Hacklab](https://hacklab.so/org/rational)

Startup · 2 people on Hacklab

## Links

- [Website](https://rational.to/)
- [Y Combinator](https://www.ycombinator.com/companies/rational)
- [LinkedIn](https://www.linkedin.com/company/rationalto)
- [X](https://x.com/RationalDotTo)

## About

<!-- hacklab:yc-profile -->

## YC company profile

First Zero-human Accounting Firm

Rational is building the first accounting firm with no humans. It's entirely run by our AI employees, who go from client intake to doing the books to filing with the IRS. We secure 90% cost reduction, 24/7 support, and an overall seamless experience for businesses.

- **YC batch:** Summer 2026
- **Founded:** 2026
- **Team size:** 2
- **Location:** San Francisco
- **Country:** US
- **Status:** Active
- **Industry:** B2B
- **Stage:** Early
- **Tags:** Finance, B2B, Enterprise, AI
- **YC partner:** Jared Friedman

## Founders

### 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.

[LinkedIn](https://www.linkedin.com/in/jibril-moinuddin-32702b271/) · [X](https://x.com/JibrilAsif)

### Christ Xu — Founder/CTO

CTO at Rational. Prev Youngest Tencent Senior SWE.  2x IOI Camp, IMO Camp, published algo researcher.

[LinkedIn](https://www.linkedin.com/in/christ-xu-687868298)

[Source: Y Combinator](https://www.ycombinator.com/companies/rational) · Retrieved 2026-11-02. Company information is self-reported on YC.

## Current staff

- [Christ Xu](https://hacklab.so/christ-xu) — Founder/CTO (Present)
- [Jibril Moinuddin](https://hacklab.so/jibril-moinuddin) — Founder/CEO (Present)

## Open jobs

- [Forward\-Deployed Engineer](https://hacklab.so/jobs/bdff34dd-bbea-51fc-aa25-edcb8faf9594) — Full\-time · On\-site · San Francisco, CA, US · $120K \- $200K · 0\.50% \- 2\.00% equity
- [Machine Learning Researcher](https://hacklab.so/jobs/5df3c2b9-80ee-5ae7-bcd6-dd8d690aa28d) — Full\-time · On\-site · San Francisco, CA, US · $150K \- $200K · 0\.50% \- 2\.00% equity
- [Software Engineering Intern](https://hacklab.so/jobs/4a56eaed-7d5c-5ee2-95a5-b0e64792eb89) — Internship · On\-site · San Francisco, CA, US · $8K \- $12K / monthly
- [Applied AI](https://hacklab.so/jobs/158b8503-5e47-5cee-8032-d3c376de7480) — Full\-time · On\-site · San Francisco, CA, US · $120K \- $200K · 0\.50% \- 2\.00% equity