RentFlow, a Y Combinator startup, is addressing a critical financial pain point for small businesses: fixed monthly rent payments misaligned with uneven cash flow. The company has developed infrastructure to transform fixed rent into cash-flow-synced products, targeting the $20B+ rent-splitting market.

The startup is hiring a Senior AI/ML Lead to design underwriting models that analyze real-world SMB cash flows from transaction-level data. This foundational role involves building LLM-powered systems for real financial decisions affecting how business owners pay rent, with direct equity and technical direction influence.

Live since May 2025, RentFlow is growing at approximately 3x month-over-month while forming partnerships with leading rent payment platforms and SMB software companies. Their approach aims to prevent business closures caused by cash flow stress while creating an AI CFO layer for businesses.