Senior/Staff Platform Engineer

Get to Know Us Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by ITOps/SecOps teams, consulting pentesters, and MSSPs and MSPs.  We are a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools, false positives resulting in alert fatigue, blind spots, "checkbox” security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results.   ABOUT THE ROLE We are looking for a Senior OR Staff Platform Engineer to join Horizon3’s Internal Platform Team (IPT) and shape the cloud and delivery foundations behind NodeZero. You will lead complex, cross-team initiatives; define platform direction; improve developer workflows; and establish standards that make our systems secure, reliable, and easier to operate. This is a hands-on technical leadership role for an engineer who enjoys solving ambiguous problems and building reusable platform capabilities. WHAT YOU’LL DO PLATFORM STRATEGY, DELIVERY & OPERATIONS - Lead the design and evolution of AWS, Kubernetes/EKS, and shared platform services. - Define architecture for infrastructure automation, service delivery, regional capabilities, and ephemeral environments. - Build reusable platform capabilities, self-service workflows, and release-safety practices. - Evolve infrastructure-as-code and declarative approaches, including Terraform and Crossplane-related capabilities. - Improve platform reliability, observability, security, performance, and operability. - Participate in on-call and incident response, leading post-incident improvements. TECHNICAL LEADERSHIP & COLLABORATION - Drive high-impact initiatives across multiple teams and balance reliability, security, cost, developer experience, and delivery speed. - Establish platform standards, reduce technical debt, and guide design decisions. - Partner with feature teams to turn platform needs into durable solutions. - Mentor engineers and raise the technical bar across Engineering. - Improve documentation, runbooks, interfaces, and self-service paths. - Communicate clearly and build alignment across Platform, Application Engineering, Data Engineering, Product, Program Management, and Security. WHAT YOU’LL BRING REQUIRED QUALIFICATIONS - 8+ years in platform engineering, infrastructure engineering, SRE, DevOps, or software engineering with substantial production-platform ownership. - Deep experience designing and operating cloud platforms, preferably AWS. - Strong Kubernetes experience, including production operations, networking, reliability, and troubleshooting. - Strong infrastructure-as-code and automation experience with Terraform, Crossplane, or comparable tools. - Experience operating CI/CD and delivery infrastructure. - Strong understanding of IAM, secrets, networking, ingress, and least privilege. - Experience with distributed-systems observability and operational practices. - Proficiency in Go and Python for platform services, developer tooling, or automation. - Demonstrated success leading complex initiatives across multiple teams. - Excellent communication, mentoring, and technical-influence skills. PREFERRED QUALIFICATIONS - Multi-region or multi-environment SaaS platform experience. - Internal developer platform, declarative API, or Platform-as-a-Service experience. - GitLab CI/CD, self-hosted runners, OpenTelemetry, or Datadog experience. - Ephemeral-environment, automated-provisioning, or platform-lifecycle experience. - Security-sensitive, regulated, or cybersecurity experience. - Startup or high-growth company experience. OUR PLATFORM STACK - AWS, Kubernetes, and EKS - Terraform and Crossplane-related tooling - GitLab and CI/CD pipelines - OpenTelemetry and Datadog - Linux, containers, networking, IAM, and secrets-management systems - Go and Python for automation and platform services Exact tool matches are less important than strong platform fundamentals, sound judgment, and end-to-end ownership of production systems. WHAT SUCCESS LOOKS LIKE - Engineering teams move faster through reliable platform capabilities and self-service workflows. - Shared services