Sean Johnson
Platform Engineer focused on DevOps, DevSecOps, and Kubernetes platform engineering. Currently building secure multi-cloud delivery paths at F5.
This portfolio is a live window into my Kubernetes reference cluster. Metrics are pulled in real-time through a Cloudflare Worker, demonstrating the observability and security boundaries of a rebuildable GitOps platform.
Cluster Heartbeat
Nodes
Pod Status
CPU
Memory
Cluster Uptime
Policies
Violations
Infrastructure Map
Interactive view of the reference platform from Git commit to public telemetry.
Security Architecture
A narrow public telemetry path: GitOps controls the platform, policy guards the cluster, and the browser only sees sanitized aggregate health.
Public Git Source
L1Reference platform state is reviewed and rebuilt from GitHub
Flux Reconciliation
L2Cluster controllers apply only the declared GitOps state
OPA Gatekeeper
L3Admission policies enforce labels and privileged-container guardrails
Private Metrics Backend
L4Prometheus and Grafana stay internal behind a Cloudflare Tunnel
Sanitized Worker API
L5The browser receives aggregate JSON, never raw PromQL or inventory
Experience
Cloud Security Engineer
Aug 2024 — Present- •Manage WAF and identity policies (SAML, OAuth) for 100+ enterprise customers across multi-cloud environments.
- •Drive programmatic policy changes via API for auditable, consistent security configurations.
- •Design secure delivery architectures translating compliance requirements like NIST and FedRAMP into deployable controls.
- •Lead incident response for managed security controls, strengthening policy via cross-environment attack pattern analysis.
Security Engineer, App Delivery & Identity
Oct 2016 — Aug 2024- •Engineered SAML, OAuth, and Kerberos federation on F5 APM as a zero-trust gateway with adaptive MFA.
- •Designed Advanced WAF policies covering OWASP Top 10, bot defense, and behavioral analysis.
- •Authored 100+ KCS articles deflecting 20,000+ support cases (estimated $12M in savings).
- •Early adopter for BIG-IP Next (Kubernetes) and r-Series, maintaining full operational workload.
Infrastructure Operations Engineer
Jan 2014 — Mar 2016- •Provided Tier 2–3 infrastructure support for Xbox Operations Center.
- •Maintained global service availability for Xbox Live serving millions of users.