ARCHITECTURE & DECISION GUIDES

The Engine Stack Blog

Practical writing on automation strategy, platform decisions, and why programs actually fail — grounded in delivery work, not vendor talking points.

What Makes a Prior Authorization Workflow a Good Automation Candidate

Not every prior auth queue is worth automating first. Here's what we actually check during SCAN and GATE before recommending one — including what CMS's 2026-2027 rule changes mean for payor portals.

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RPA vs. Agentic AI: The Decision Framework We Actually Use

Not every process needs an autonomous AI agent. Here's the branching logic we use to decide between deterministic RPA and LLM-based reasoning — grounded in 2026's actual adoption data, not vendor hype.

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3-Way Matching: Where RPA Ends and Judgment Begins

3-way matching looks fully deterministic until it isn't. Here's exactly where the rule-based logic stops and a human (or an agent) needs to step in — with 2025 AP benchmark data on what the gap actually costs.

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Why Most Automation Programs Stall After the Pilot

The first bot almost always works. It's what we call the Ten-Bot Stall — the point where automation programs quietly stop scaling — and it's rarely a build problem.

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