Identity and Access in Cloud Architecture

In any cloud architecture, the first question is not compute, storage, or networking. It is who can do what.

In AWS, access control is handled by Amazon IAM. IAM allows you to define:

• Who (users, roles, services)
• What actions they can perform
• On which resources
• Under which conditions

Architecturally, IAM is the control plane gatekeeper. Every API call in AWS is evaluated against IAM policies before execution.

When a request is made:

1. An identity is authenticated.
2. AWS evaluates all relevant policies.
3. An authorization decision is made (allow or deny).
4. If allowed, the request proceeds.

This is critical because AWS is API-driven. Every console click translates into an API call. IAM protects every single one.

Why this matters architecturally:

• Security must be centralized.
• Access must be controlled consistently across all services.
• Misconfigured IAM can expose entire environments.
• Proper IAM design reduces blast radius during incidents.

A common beginner mistake is focusing on services before securing identities. In production, identity design comes first.

IAM Foundations

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What does IAM primarily control?

Compute performanceNetwork routingAccess to AWS resourcesBilling reports

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IAM controls who can access AWS resourcesAll AWS actions are API callsPolicies are evaluated before executionIdentity design is foundational in cloud security