Merlin Kafka
Founder of Rex, AI Operations Partner for Enterprise Order to Cash
Company
Merlin Kafka is listed as a founder of Rex. Rex is an AI-native service for order to cash. We replace people-heavy operations with AI agents that continuously manage invoices, customers and exceptions. Order to cash is a $60B outsourced function because the work is too messy for traditional automation. Every customer has different context, exceptions do not follow clean rules, and the next step is often buried in emails, portals, handoffs, or someone’s memory. Rex agents run continuously in the background and resolve work to SLA standards so cash keeps moving. We're live with pre-IPO tech companies, managing >$500m in receivables from F100 companies, cutting manual follow-up cycles from weeks to hours. We founded Rex after spending four years building Sequence, an a16z-backed finance ops platform, from zero to Series A — where we saw firsthand that at-scale, O2C still runs on manual labour. Rex is the #1 winner of the Vercel AI Accelerator out of 2,500 teams, selected by Guillermo Rauch and leaders from OpenAI, Anthropic, Browserbase and more.
Founder traction evidence
Public posts and activity attributed directly to this founder.
- LinkedIn
We just moved to San Francisco for Y Combinator (S26) 🌁 Excited to continue building Rex amongst some incredible founders. | Merlin Kafka | 175 comments
| Merlin Kafka | 175 comments URL Source: https://linkedin.com/posts/activity-7475606763560632320-L7Fq Markdown Content: Agree & Join LinkedIn By clicking Continue to join or sign in, you agree to LinkedIn’s [User...
- X
Just moved to San Francisco for @ycombinator (S26) 🌁
Just moved to San Francisco for @ycombinator (S26) 🌁
- X
We gave our agents the ability to complain to us. At Rex, we’re running agents to automate order to cash processes end to end. One way ...
We gave our agents the ability to complain to us. At Rex, we’re running agents to automate order to cash processes end to end. One way to improve them is to read through their reasoning traces (the inner monologue of the agent) and see exactly why it chose one action over...