Appian and Synechron introduce Open Underwriting Stack for AI-Powered, Connected Underwriting

Joint architecture combines Synechron's InsureMESH with the Appian Platform to help carriers modernize underwriting without disrupting core systems.

NEW YORK, Aug. 11, 2026 /PRNewswire/ -- Appian [Nasdaq: APPN] and Synechron announced the Open Underwriting Stack, a joint reference architecture designed to help insurance carriers accelerate underwriting with AI process automation and an open data foundation. The architecture combines Synechron's InsureMESH—a data-first operational platform—with Appian's process orchestration, data fabric, and AI agents.

This combination enables carriers to process transactions across legacy core systems, modern SaaS applications, and external data sources without replacing the systems they already trust. The Open Underwriting Stack was demonstrated at InsurTech Insights New York with Aaron Lamp, CIO of Tokio Marine HCC PRG, sharing how connected operations are reshaping insurance.

Insurance carriers are under pressure to modernize underwriting, apply AI responsibly, and reduce operational friction. However, many remain constrained by legacy core systems, siloed data, and multi-year transformation programs. The Open Underwriting Stack gives carriers a practical way to add a governed operational AI layer around existing systems while maintaining auditability, control, and underwriter authority in decision-making.

The architecture features three connected layers working together to help carriers transact on day one: Synechron's InsureMESH platform, Appian's process automation and AI agents, and a configurable application layer via Appian Connected Underwriting.

Synechron's InsureMESH is a data-first, API-first, cloud-first layer that holds insurance transaction events in an open, universally accessible format rather than locking them inside fixed legacy sequences. The platform includes a native policy admin system or can easily integrate with an existing core system. Since the data remains open within the secured framework, the platform can call external SaaS services for discrete functions—such as rating, billing, or document printing—returning instant results at reduced cost. Always AI-ready, InsureMesh allows carriers to deploy AI at scale without the cumbersome data preparation and expensive changes legacy systems demand.

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