Zero-Trust Architecture

Zero trust is a security model that assumes no network is inherently safe — every request must be authenticated and authorized regardless of whether it originates "inside" the corporate network or from the public internet. It replaces the old castle-and-moat approach, where anything behind the VPN was implicitly trusted, with "never trust, always verify": identity, device posture, and least-privilege checks on each access. For SaaS builders, zero trust shows up in two ways. Internally, you protect your own admin tools and infrastructure with per-request identity checks (often via an identity-aware proxy) instead of a flat VPN. Externally, enterprise buyers increasingly expect your product to fit their zero-trust posture — SSO enforcement, short-lived tokens, and scoped API access. Practical note: zero trust is a direction, not a product you buy. Concrete first steps are enforcing SSO and MFA everywhere, issuing short-lived credentials, and removing standing access to production in favor of just-in-time grants.