Overlay Auth vs Full CIAM Replacement: How to Choose the Right Architecture

Building enterprise Single Sign-On (SSO) and System for Cross-domain Identity Management (SCIM) in-house can be time-consuming and costly, prompting companies to consider whether to integrate an overlay authentication system or undertake a full Customer Identity and Access Management (CIAM) replacement. An overlay solution involves adding a broker to the existing system, allowing enterprise identity provider connections without altering the user database, and is typically faster and less risky. Conversely, a full CIAM replacement requires migrating all users and credentials to a new platform, offering more control but introducing significant migration risks, including potential password resets and parallel system operations. The decision between these paths hinges on factors like migration risk tolerance, cost models, and core authentication issues; overlay solutions are often sufficient for addressing specific enterprise demands like SSO, while full replacements are justified if the existing system is fundamentally flawed or fragmented. Pricing models can also influence the decision, as per-connection pricing is generally more cost-effective for enterprise SSO than per-Monthly Active User (MAU) pricing, especially when the user base includes many self-serve customers. The text suggests that most companies overestimate their need for a full CIAM replacement when an overlay could meet their immediate requirements with less risk and cost, advocating for a careful evaluation of the actual needs and pressures before committing to a migration path.

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