The hidden long-term costs of building your own authentication system

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A technical analysis argues that while engineers can build a basic login system in a weekend, the true cost of homegrown authentication lies in ongoing maintenance, security obligations, and compliance demands. Teams that build their own auth take on permanent ownership of a security-critical system, including password hashing, rate limiting, credential stuffing defenses, and breach liability. Enterprise requirements such as SAML-based SSO, SCIM provisioning, MFA, and tamper-evident audit logs add significant complexity that grows over time. Annual compliance frameworks like SOC 2 and ISO 27001 further burden in-house auth builders, who must document and defend every control themselves. The piece concludes that building auth makes sense only for internal tools with no compliance needs, identity-focused products, or teams with dedicated security staff — otherwise, buying is likely the more practical choice.

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