Staff Platform Security Engineer (Security)

Phantom is a fully remote company building products that connect people to open financial markets through self-custody and accessible financial technology. The Staff Platform Security Engineer will own and improve security across AWS and Kubernetes environments, securing identities, workloads, control planes, and deployment systems. The role involves building practical security controls, automating remediation, responding to incidents, and partnering with infrastructure and engineering teams.

Responsibilities:

• AWS Security: Own and improve security across Phantom’s multi-account AWS environment, including IAM, Identity Center, networking, compute, storage, secrets, logging, and organization-level guardrails
• Kubernetes Security: Secure production Kubernetes environments running on Amazon EKS, including cluster configuration, workload identity, RBAC, admission controls, network boundaries, secrets, container security, and tenant isolation
• Identity and Access: Design least-privilege access models for engineers, services, and automation. Build scoped, auditable, and time-bound access paths for sensitive production systems
• Mission-Critical Systems: Protect the infrastructure supporting products and services that handle sensitive data and high-value operations
• Cloud Security Architecture: Lead security design for new infrastructure, platform services, and major architectural changes
• Infrastructure and Policy as Code: Build reusable security controls using tools such as Pulumi, Terraform, Kubernetes policy engines, and automated configuration validation
• CI/CD and Supply Chain Security: Harden build, deployment, and release systems, including GitHub Actions, workload federation, build runners, dependencies, artifacts, signing, provenance, and access to production environments
• Security Automation: Build tools that identify and remediate cloud and Kubernetes risks at scale. Apply AI-assisted workflows where they materially improve analysis, coverage, or response speed
• Cross-Functional Leadership: Partner closely with Infrastructure, SRE, Developer Experience, and product engineering teams. Establish practical platform-security standards and help teams adopt them

Requirements:

• • 7+ years of experience in platform security, cloud security, infrastructure security, security engineering, or a closely related engineering role
• • Deep, hands-on experience securing production AWS environments. You understand IAM and resource policies, workload identity, network security, secrets management, logging, organization-level controls, and the ways these systems fail in practice
• • Deep experience securing Kubernetes in production, preferably Amazon EKS, including RBAC, workload identity, admission policy, network policy, pod security, secrets, and cluster hardening
• • Experience designing or securing mission-critical systems where compromise, excessive privilege, or loss of availability could have significant customer or business impact
• • Strong understanding of identity, authorization, least privilege, isolation, and blast-radius reduction across both human and machine access
• • Experience securing CI/CD and software supply chains, including GitHub Actions or similar systems, build runners, workload federation, artifacts, and production deployment paths
• • Experience writing and reviewing infrastructure as code using Pulumi, Terraform, CloudFormation, or similar tools
• • Ability to write production-quality code or automation in a language such as TypeScript, Python, Go, or Rust
• • High agency and ownership. You can take an ambiguous platform-security problem from initial investigation through implementation and verified remediation
• • Clear communication and a strong track record of partnering with infrastructure and engineering teams while maintaining a high security bar
• This role is fully remote; however, we're only open to candidates based in the US and Canada
• • Experience with AWS Nitro Enclaves or other trusted execution environments, including attestation, isolation boundaries, secure key handling, and operational lifecycle management
• • Experience securing financial, payments, wallet, custody, or other high-value transaction systems
• • Familiarity with key-management infrastructure, AWS KMS, CloudHSM, cryptographic signing systems, or secrets-management platforms
• • Experience operating or securing multi-region Kubernetes and AWS environments at significant scale
• • Familiarity with service meshes and cloud-native networking technologies such as Istio, PrivateLink, Transit Gateway, or eBPF-based controls
• • Experience with GitHub OIDC, Argo CD, Helm, Crossplane, or Kubernetes-based infrastructure delivery
• • Experience using cloud-security and observability platforms such as Wiz, Datadog, GuardDuty, Security Hub, or CloudTrail
• • Experience building policy-as-code, automated remediation, or security tooling used by a large engineering organization
• • Familiarity with blockchain infrastructure or self-custodial wallet architecture