Build vs. Buy: Integration Strategy in the Age of AI

AI can draft an integration in minutes — so why do the smartest teams still choose to buy? Because in the employment ecosystem, code was never the bottleneck. Access, data accuracy, trust, and relentless maintenance are.

This guide breaks down the build-vs-buy decision for HR, payroll, and benefits integrations in the age of AI: where AI genuinely helps, where it hits a wall, and how to decide with confidence.

Get a clear-eyed framework for one of the most consequential decisions your team will make:

• The real coverage math behind build vs. buy. The top 10 payroll systems cover just 61% of employers, leaving hundreds of providers spread across the long tail.
• Where AI actually helps and where it falls short, from data mapping to auth breakage
• The hidden costs of building in-house that never show up in an engineering estimate, including the walled gardens that gate access to employment data
• How leading platforms weighed build vs. buy — including how Thatch got to market 10 months faster and saved $800K by not building in-house