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Rational
YC S26rational.to · 4 open roles in the last 6 months · hiring in 1 country
Rational is building an accounting firm run mostly by AI agents, doing bookkeeping and tax filing for startups and enterprise teams.
Startup brief from its YC profile and homepage and 4 roles from the last year · updated 19 Oct 2026. Not a statement by the company.
What they're building
Founded 2026 · 2 people · San Francisco
Rational wants to run an accounting firm with AI agents that take a client from onboarding through bookkeeping to filing with the IRS, offering instant setup, round-the-clock support and experts when needed. Its site offers plans for startups and enterprise teams, with a waitlist for new clients.
What this hiring suggests
- Two roles build tools for accountants who use the internal platform every day, so people still do or check part of the work while the agents are developed.
Who they're hiring
Applied AI and research
An applied AI engineer to build the agents that do the accounting work, including LLM orchestration and evaluation pipelines, and a machine learning researcher to design and evaluate models for accounting.
Product engineering
A forward-deployed engineer to sit with the firm's accountants and ship fixes the same week, and a software engineering intern to build backend and interface features of the internal platform accountants use every day.
Questions to ask in a coffee chat
- Which accounting tasks do the agents handle on their own today, and which still go to the accountants?
- How do you check that an agent's books or filings are correct before they reach a client?
- What does the machine learning researcher work on that the applied AI team does not?
- How does a forward-deployed engineer split the week between sitting with accountants and shipping code?
A brief, not a roadmap: Rational posted fewer than 5 roles in the last year, too few to read a direction from. It becomes a roadmap once there are more.