Start with identity and network
Enforce MFA for human and privileged access, centralize identity (SSO where possible), and restrict admin paths. Pair that with a clear network model: private subnets for workloads, no broad 0.0.0.0/0 on sensitive ports, and logging enabled for control plane and data-plane events.
Native controls + benchmarks
AWS: Organizations, SCPs, Config rules, GuardDuty, and KMS-backed encryption defaults.
Azure: Management groups, Azure Policy, Defender for Cloud recommendations, and Key Vault for secrets.
Align to CIS or your cloud provider’s well-architected guidance, then automate checks (policy-as-code or CSPM) so drift is visible weekly—not at audit time.
Phased rollout
Phase 1: identity, logging, and backups. Phase 2: encryption, key management, and endpoint coverage. Phase 3: advanced detection, IaC scanning, and fine-grained segmentation. Measure progress with a simple scorecard so leadership sees risk reduction over time.