Merlin Kafka
Founder of Rex, AI-native BPO 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. Rex replace manual 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...
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Today we're launching Rex (YC S26) Every enterprise is exploring where AI can transform back-office operations.
Today we're launching Rex (YC S26) Every enterprise is exploring where AI can transform back-office operations. Order-to-cash is one of the clearest places to start: it is high-volume, manual work with a direct impact on cash. Introducing Rex:
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We won Vercel's AI Accelerator - and are coming out of stealth @rexdotinc 🚀
We won Vercel's AI Accelerator - and are coming out of stealth @rexdotinc 🚀
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Just moved to San Francisco for @ycombinator (S26) 🌁
Just moved to San Francisco for @ycombinator (S26) 🌁
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Excited to see Rex featured on the list of AI start-ups funded by @ycombinator - If you're running a large finance ops function and thinking about AI transformation, send me a note.
Excited to see Rex featured on the list of AI start-ups funded by @ycombinator - If you're running a large finance ops function and thinking about AI transformation, send me a note.
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@synthesiaIO serves 90% of the Fortune 100.
@synthesiaIO serves 90% of the Fortune 100. Their finance team partnered with @rexdotinc to transform order-to-cash into an AI-native operation. Today we’re sharing the story. https://t.co/7f83Y4wIBR
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We gave our agents the ability to complain to us.
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
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Distillation is the sincerest form of flattery
Distillation is the sincerest form of flattery