Senior Cloud Security Engineer

About the role

You'll be the dedicated security engineer at a derivative exchange (~250 people, 50-100 person dev team). All infra is AWS. DevOps builds it; you make sure it's secure and can prove it. You'll be hands-on — reviewing Terraform PRs for security gaps, building automated drift detection, writing SIEM rules, and owning the credential lifecycle. When the CTO asks, "Are we secure?" you pull up a dashboard, not a slide deck. You own the security posture of the infrastructure from shaping how access and controls are modelled, to verifying they hold in practice.

What you'll do

• Verify that infra implementations match the security model — continuously, not quarterly.
• Build automated compliance checks and drift detection (AWS Config, Steampipe, custom tooling, whatever works)
• Review Terraform PRs for IAM, SCP, and network security gaps before they hit production.
• Own credential lifecycle: rotation, PAM, JIT access, session recording.
• Write and tune detection rules in OpenSearch SIEM.
• Build evidence dashboards that prove security posture to non-security leadership 7. Evaluate security tooling (build vs buy) and own the recommendation with documented tradeoffs.

Must-haves

• 5+ years in infrastructure or security engineering, with at least 2 years focused on AWS security
• IAM beyond basic roles — you understand policy evaluation logic, permission boundaries, cross-account access patterns
• Have built automated security checks that run in production (any tooling)
• Can read and critically review Terraform for security posture
• Have operated PAM tooling or credential rotation in production (any tool)
• Comfortable owning a security domain end-to-end without constant direction

Strong advantages

• Worked at an org < 500 people where you were one of the very few (or the only) security engineers
• Multi-account AWS Organizations / SCP experience. Wrote SIEM detection rules in production (any platform — OpenSearch, Splunk, Elastic, etc.)
• Regulated fintech, exchange, or payments background.
• Built security evidence/reporting that non-security people actually used.