AI-Native ERP vs. Legacy ERP: What's the Difference? with Santiago Nestares, Founder & CEO of DualEntry

What does it actually mean for an ERP to be AI-native and why does it matter for your finance team?

In this episode of the AI to ROI podcast, host Ray Rike sits down with Santiago Nestares (Santi), Founder and CEO of DualEntry, to unpack the real differences between legacy ERP systems and a ground-up AI-native platform.

Santi shares the origin story behind DualEntry, born from a painful nine-month ERP implementation at his previous company that cost a team of 12 and hundreds of thousands of dollars—and explains why simply adding AI features on top of old database architecture misses the point entirely. AI, he argues, isn't a feature you plug in; it's a design philosophy that must be embedded at every layer of the product.

Ray and Santi dig into one of the thorniest challenges in enterprise finance: the tension between probabilistic AI models and the zero-error standard that accounting demands. Their answer? Deterministic guardrails—approval workflows, permissioning layers, and audit trails—that let AI work freely in draft mode while keeping humans accountable for every posted transaction.

You'll also hear about DualEntry's "Next Day Migration" approach, including how the company uses AI to map and migrate every transaction (not just trial balances) in hours rather than months, giving prospects a live sandbox with their own data before they ever sign a contract.

What You'll Learn

• Why adding AI to a legacy ERP is like "running an on-prem system with a CD on the cloud", and what truly AI-native architecture looks like instead
• The difference between deterministic and probabilistic systems, and why accounting can't afford to get it right only 99.9% of the time without the right guardrails
• How DualEntry's Next Day Migration works: AI-assisted mapping, atomic transactions, and a live sandbox demo using the prospect's own data
• The real ROI of AI-native ERP from eliminating manual categorization drudgery to enabling multi-dimensional segmentation that surfaces hidden pockets of value and risk
• How Dto build audit-ready explainability without being able to explain the AI itself - by tracing every decision back to a human approval
• Why early-career finance professionals are "living the luckiest time" in the professionand how to lean into AI rather than fear it

Episode Topics at a Glance

• 00:00 — Welcome & guest introduction
• 00:51 — Santi's origin story: a nine-month legacy ERP nightmare that sparked DualEntry
• 02:52 — AI-native vs. legacy ERP: what's the real difference?
• 04:48 — Deterministic vs. probabilistic systems explained
• 06:49 — How to identify a truly AI-first platform vs. an AI add-on
• 10:07 — Next Day Migration: using AI to accelerate ERP transitions
• 14:11 — Implementation team design: finance practitioners + forward-deployed engineers
• 17:18 — Measurable ROI: from real-time bank feeds to AI-driven business insights
• 22:52 — AI explainability, audit trails, and the permissioning layer
• 25:06 — Rapid fire: CFO ROI variables, who owns AI ROI, and advice for early-career finance professionals

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