Definite, a Y Combinator Summer 2026 startup, has launched back-office AI agents that let finance teams build read-only agents on a single model of their books, according to the company's website and YC profile. Its central claim is that the AI models only propose, while a versioned rules engine makes every decision.
That division is the company's answer to the accuracy worry that keeps many finance leaders wary of letting AI near the ledger.
What the product does
On its website, Definite calls itself "the ontology layer for finance teams": a connected model of the systems a company already uses, built for both people and agents. The company said the model unifies ledgers, operational systems, documents and spreadsheets, and the agents run on top of it.
According to the YC profile, back-office staff build those agents in plain English. Listed workflows include close and reconciliations, FP&A (financial planning and analysis) and variance analysis, billing and revenue, and tax and compliance, regulatory reporting among them. The YC launch blurb promises to "turn weeks of regulatory reports into hours."
The company's docs describe a single durable run with five stages: ingest, map, check, investigate and assemble.
Rules decide, models propose
Agents propose mappings and drafts, each with provenance. A deterministic rules engine then returns PASS, FAIL or CANNOT_VERIFY, according to Definite's documentation. Exceptions go to a human.
"Models propose. Configured rules calculate and decide," the company's security page says.
The FAQ is blunter. Asked whether an AI model calculates or approves financial results, it answers no. Deterministic rules handle calculations, matching, thresholds and validations, and people approve decisions when the workflow requires it.
Every check leaves a signed receipt. The docs reference hash-chained rule receipts and a Merkle audit ledger, a tamper-evident record structure, with lineage traced back to the source record, field or file cell. The console shows per-attribute verification results and a receipt-verification badge. Workflows can encode explicit policies such as a "Majority rule 2 of 3," along with thresholds, mandatory review and separation between preparer and approver.
Read-only by design
Definite never writes back to source systems and never moves money, the YC profile says. The security page says connection setup rejects over-scoped or write-capable credentials. The company's terms go a step further, stating that it "does not sign, submit, or take responsibility for a regulatory filing on your behalf."
Listed integrations include NetSuite, Workday Financials, Sage Intacct, Oracle Fusion Cloud ERP, SAP S/4HANA, Microsoft Dynamics 365 Finance, BlackLine, Stripe, Ramp, Brex and Snowflake, along with Excel, Google Sheets and PDFs. All connections are read-only.
Customers can deploy the software hosted, in their own cloud or VPC, on-premises, or air-gapped. The docs list SDKs and a REST API in TypeScript and Python.
One gap stands out for a product aimed at finance buyers: as of Nov. 1, 2026, the security page lists no certifications, SOC 2 included.
Founders and company
The YC profile lists three founders, all with University of Waterloo backgrounds. CEO Gurshabd Singh Varaich is a former BitGo intern. Mazin Al-Ani previously worked at Optiver and Boosted.ai, and Farhan Ur Rehman at Meta.
As of Nov. 1, 2026, LinkedIn lists the San Francisco company at 2-10 employees, though its company-size bands can lag and are approximate. The docs footer names the legal entity as Ledgix Inc. No funding beyond YC backing had been disclosed as of Nov. 1, 2026. Founderland, in a July 26, 2026 piece, noted that the company had no named customers at launch.
The launch date is slightly murky. Stompstart, a third-party tracker, dates the Launch YC announcement to July 15, 2026, while YC's page carries no timestamp.
Definite should not be confused with definite.app, an AI data platform that announced a $10 million seed round on Aug. 21, 2025. That is a separate company with a different team.
A crowded field
Finance agents are a busy category. Concourse announced a $12 million Series A and general availability on Jan. 27, 2026, naming Palo Alto Networks, Front and Tecovas as customers. Board unveiled FP&A and Controller agents on March 18, 2026. Workiva launched reporting agents and Agent Studio in late summer 2026, and Hawk AI released a Regulatory Reporting Agent for SAR (suspicious activity report) filings on Oct. 15, 2026.
Earlier entrants set the pace. Ramp announced agents for finance controllers in July 2025, and Workday announced finance and HR agents in September 2024.
Definite is wagering that the agent itself is not where the difficulty lies. "The agent isn't the hard part, getting clean data out of their systems is," reads the founder-authored copy on its YC profile.
