Small SaaS teams usually do not need a broad, enterprise-style cloud audit as their first step. They need to know whether the AWS environment is exposed, whether privileged access is controlled, whether important events are visible, and whether the team can explain its posture to customers or leadership.
This checklist is a starting point for that review. It is deliberately practical. The goal is not to produce a long list of theoretical issues. The goal is to identify the controls that matter most, the evidence that already exists, and the gaps that should be fixed first.
1. Account and access model
Start with how the AWS environment is organised and who can make high-impact changes. For many small environments, IAM is where the most useful findings appear. Over-broad roles, old access keys and unclear ownership are common, and they are usually fixable without changing the product architecture.
Useful review questions:
- Are production, non-production and shared services separated clearly?
- Is root account access locked down and monitored?
- Are administrator roles limited to the people and workflows that genuinely need them?
- Are human users using SSO or another central identity provider?
- Are access keys still present for people, CI systems or third-party tools?
- Is there a clean process for joining, moving and leaving users?
2. Logging and audit trail coverage
An AWS security review should confirm that important events are recorded and retained for long enough to be useful. The question is not just “is logging turned on?” The better question is: if something went wrong last Friday, could the team reconstruct what happened?
Useful review questions:
- Is CloudTrail enabled across all regions and protected from easy modification?
- Do the right people know where to look for logs during an incident?
- Are load balancer logs, VPC Flow Logs, and application logs available where they matter?
- Are identity-provider logs retained and accessible?
3. Detection, alerting and incident response
GuardDuty, Security Hub and AWS Config can be valuable, but they should not be enabled as box-ticking exercises. Check whether findings are routed somewhere people actually review. Confirm who owns triage, what gets ignored, and whether the tooling creates useful signal or background noise. A small team may need a narrower, cleaner baseline rather than every possible rule. It is also critical to know who is responsible for responding when an alert fires.
Useful review questions:
- Which findings generate action, and which are ignored because they are noisy?
- Are critical findings routed outside AWS email notifications?
- Is there a documented path from alert to owner to decision?
- Does the team know who to call and what steps to take during a security incident?
4. Public exposure and network controls
Review internet-facing assets and the controls around them. This includes load balancers, API gateways, security groups, public S3 buckets, public snapshots, exposed administration services and any legacy components that have grown around the product.
The review should separate intentional exposure from accidental exposure. A public web endpoint is normal. A publicly reachable admin interface, development database or old test host is different.
Useful review questions:
- Are there any publicly accessible administrative interfaces or databases?
- Are S3 buckets explicitly blocked from public access where appropriate?
- Are security groups regularly reviewed for overly permissive rules (e.g., 0.0.0.0/0)?
- Are legacy or unused public-facing assets identified and removed?
5. Data protection and backup reality
Backups are often present but unproven. A review should check what is backed up, where it is stored, how long it is retained and whether restores have actually been tested.
For SaaS teams, the review should also look at the recovery assumptions around databases, object storage, infrastructure state, secrets and deployment pipelines. A backup that cannot be restored under pressure is mostly a comfort blanket.
Useful review questions:
- What data is backed up, where is it stored, and how long is it retained?
- Have restoration procedures been successfully tested recently?
- Are backups protected from accidental or malicious deletion (e.g., cross-account or immutable)?
- Are the recovery assumptions clear for all critical infrastructure components?
6. Infrastructure as code and change control
If the environment is managed through Terraform or another infrastructure-as-code workflow, include it in the review. Check how changes are reviewed, how secrets are handled, whether state is protected, and whether privileged CI/CD roles are tightly scoped.
If the environment is mostly manual, note that honestly. The first remediation step may be documenting the current baseline rather than trying to convert everything to code at once.
Useful review questions:
- Are infrastructure changes reviewed before being applied?
- Are secrets securely injected rather than hardcoded in repositories?
- Are privileged CI/CD IAM roles scoped to least privilege?
- Is the infrastructure-as-code state file protected and access-controlled?
7. Vulnerability management and patching
Even the best infrastructure configuration can be undermined by unpatched software or outdated dependencies. A review should check how the team handles known vulnerabilities in their workloads.
Useful review questions:
- Are EC2 instances, containers, or AWS Lambda runtimes regularly updated?
- Is there a process for scanning container images or code dependencies for CVEs?
- How quickly can the team apply critical security patches when required?
8. Evidence for customers and leadership
Many AWS reviews happen because a customer, insurer or board asks hard questions. The output should therefore be evidence-ready. (If you are preparing for this process, you might find our guide on what to collect before an AWS security review helpful).
Useful evidence includes:
- screenshots or exports showing configured controls;
- a plain-English summary of current posture;
- a prioritised remediation list;
- clear separation between completed controls and open risks;
- notes on accepted risks and tradeoffs.
What a good review should produce
A useful AWS security review should leave the team with fewer unknowns. It should make the important risks clearer, help the team decide what to fix first, and provide credible evidence for customer or leadership conversations.
It should not bury the team in generic best-practice findings. Small SaaS teams need security work that respects engineering capacity and improves the actual environment.