Senior Infrastructure Security Engineer

Prometheum•New York, NY

2d•$160,000 - $185,000•Remote

About The Position

This is a senior, hands-on role with intentionally broad scope. Cloud infrastructure, security operations, and regulatory compliance are consolidated into a single function rather than distributed across a large team — which means real ownership, direct access to leadership, and the ability to shape how security is built and operated at Prometheum. Prometheum is actively maturing its security function, and this role will be instrumental in shaping where it goes — you'll be building on an existing foundation and defining what comes next. The right candidate has worked in a lean, regulated environment before and is energized by breadth rather than frustrated by it.

Requirements

7+ years of experience in information technology or cloud infrastructure
5+ years of experience in infrastructure, security engineering, or DevOps — with meaningful hands-on overlap across all three
Strong AWS expertise across security-relevant services: IAM, VPC, GuardDuty, Security Hub, Config, CloudTrail, Secrets Manager, KMS, Network Firewall, and PrivateLink
Production experience with Cloudflare Zero Trust — Access, Tunnel, Gateway, and WARP; familiarity with Cloudflare Workers or edge compute is a plus
Solid AWS networking knowledge: VPC design and segmentation, Transit Gateway, PrivateLink, Route 53 Resolver, and Network Firewall in a multi-account environment
Strong Infrastructure-as-Code skills using Terraform and Terragrunt
Hands-on experience securing CI/CD pipelines: SAST, container scanning, secrets detection, and policy gates in GitHub Actions or similar
Experience operating a security observability stack; Datadog is our current platform and familiarity with it is a plus
Experience operating in a regulated financial services environment and the compliance obligations that come with it
Experience with vulnerability management lifecycle: scanning, prioritization, tracking, and remediation
Proficiency in at least one scripting or programming language: Python, Go, Bash, or TypeScript
Strong written communication skills — able to produce documentation that satisfies both engineering and audit audiences

Nice To Haves

Kubernetes/EKS experience at any depth — even working familiarity is valued
Experience with blockchain infrastructure or digital asset platforms
Any of the following certifications are valued but not required: AWS Certified Security – Specialty, Certified Information Systems Security Professional (CISSP), Certified Information Security Manager (CISM), or Certified Kubernetes Security Specialist (CKS)
Experience with AI-assisted tooling in DevOps or security workflows
Background contributing to or managing vendor security reviews and third-party risk assessments
Experience working in a highly regulated financial services environment — broker-dealer, RIA, ATS, or custodian — with direct exposure to SEC or FINRA examinations
Familiarity with Regulation S-P breach notification workflows, FINRA Rule 4530 incident reporting, or AML/BSA technical control implementation

Responsibilities

Design and maintain secure AWS cloud infrastructure using Terraform and Terragrunt, with a focus on IAM least-privilege, account isolation, and security guardrails across multiple AWS environments
Manage AWS network security: VPC segmentation and design, Transit Gateway architecture, PrivateLink for service isolation, Network Firewall, and Route 53 Resolver for DNS security
Manage and maintain Cloudflare infrastructure including DNS, WAF, and edge compute
Architect and operate Cloudflare Zero Trust — including Access policies, Tunnel configuration for private network routing, Gateway egress filtering and DNS security policies, and WARP client deployment
Manage and tune AWS-native security tooling: GuardDuty, Security Hub, Config, Inspector, CloudTrail, and WAF
Integrate security controls into CI/CD pipelines (GitHub Actions) — including SAST, DAST, container image scanning, dependency vulnerability checks, and secrets detection
Enhance container and workload security through image signing, admission controllers (Kyverno), runtime policies, and base image hygiene
Manage dependency and patch lifecycle across Docker images, Helm charts, Terraform modules, and application packages
Own and operate security monitoring and incident response: maintain SIEM/log aggregation pipelines, tune alerting for anomalous behavior and policy violations, lead root cause analysis, and document post-mortems
Conduct and coordinate vulnerability assessments; track findings through to remediation
Automate compliance checks and drift detection using infrastructure scanning and policy-as-code tooling
Participate in on-call rotation to respond to security and infrastructure incidents
Support SEC and FINRA compliance obligations by implementing and documenting technical controls, and partner with legal and compliance teams during audits and regulatory reviews
Document infrastructure patterns, access controls, and security architecture for audit readiness