Architectural resiliency encompasses strategies such as redundancy across servers, databases, and networks, often spanning multiple availability zones or regions. Load balancing across L3, L4, and L7 ensures even traffic distribution, while fault tolerance mechanisms such as error detection, backup systems, automatic retries, and self-healing properties provide high availability. Graceful degradation patterns are key for maintaining service, even under adverse conditions. Monitoring must span multiple observability dimensions (logs, metrics, alerts, negative tests, security scanning, and external monitoring) integrating seamlessly with internal processes for incident response and disaster recovery. A comprehensive security strategy requires depth across process isolation, encryption, the software supply chain, and internal operations, ensuring that modern SaaS platforms meet both resilience and security requirements effectively.