Authentication in SaaS isn’t just a login screen; it’s fundamental security infrastructure. It verifies user identity, protecting your product, data, and revenue. Founders often underestimate its complexity, leading to critical mistakes like weak password handling or ignoring future roles. A robust authentication setup, even in an MVP, builds trust, supports monetization, and ensures your platform is secure and scalable from day one. Get it right, and you lay a strong foundation for growth.



