Staff Platform Engineer

horizon3ai; United States; Hybrid; USD 200,000 - 270,000; Full time

Benefits offered by this job

Equity package

Health, vision, and dental insurance

Flexible vacation

Parental leave

Remote and hybrid work

Occasional travel for onsite

Job summary

horizon3ai in the United States is seeking a Staff Platform Engineer to build and evolve the cloud and delivery foundations behind an autonomous cybersecurity assessment platform. The role blends hands-on technical leadership with cross-team influence to shape platform direction, developer workflows, and operational standards.

You will lead design of AWS/Kubernetes-based services, drive infrastructure automation, and mentor engineers across a distributed org while maintaining security and

Qualifications

• 8+ years in platform engineering or related roles.
• Experience designing and operating cloud platforms, AWS preferred.
• Strong Kubernetes operations, networking, reliability.
• IaC and automation with Terraform or Crossplane.
• Hands-on CI/CD and delivery infrastructure.
• IAM, secrets management, networking, least-privilege.
• Proficiency in Go and Python.
• Excellent communication and mentoring.

Responsibilities

• Lead the design and evolution of cloud platform services on AWS/Kubernetes.
• Define architecture for infrastructure automation and ephemeral environments.
• Build reusable platform capabilities and self-service workflows.
• Improve platform reliability, observability, security, and operability.
• Participate in on-call rotation and post-incident reviews.
• Mentor engineers and raise technical standards.

Skills

AWS

Kubernetes

Go/Python

CI/CD

IAM & security

Tools

Terraform

Crossplane

GitLab CI/CD

OpenTelemetry

Datadog

Job description

Role overview

A Staff Platform Engineer role focused on building and evolving the cloud and delivery foundations behind an autonomous cybersecurity assessment platform. The position blends hands‑on technical leadership with cross‑team influence, shaping platform direction, developer workflows, and operational standards across a distributed engineering organization.

Responsibilities

• Lead the design and evolution of AWS, Kubernetes/EKS, and shared platform services that underpin a production cybersecurity product.
• Define architecture for infrastructure automation, regional capabilities, and ephemeral environments used by engineering teams.
• Build reusable platform capabilities, self‑service workflows, and release‑safety practices using infrastructure‑as‑code and declarative approaches.
• Improve platform reliability, observability, security, performance, and operability while participating in on‑call rotation and post‑incident reviews.
• Drive complex initiatives across multiple teams, balancing reliability, security, cost, developer experience, and delivery speed.
• Mentor engineers, raise the technical bar, and improve documentation, runbooks, interfaces, and self‑service paths.

Requirements

• 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 on AWS.
• Strong Kubernetes background including production operations, networking, reliability, and troubleshooting.
• Infrastructure‑as‑code and automation expertise with Terraform, Crossplane, or comparable tools.
• Hands‑on experience operating CI/CD and delivery infrastructure.
• Solid understanding of IAM, secrets management, networking, ingress, and least‑privilege principles.
• Proficiency in Go and Python for platform services, tooling, or automation.
• Demonstrated success leading complex initiatives across multiple teams and excellent communication and mentoring skills.

Nice to have

• Multi‑region or multi‑environment SaaS platform experience.
• Internal developer platform, declarative API, or Platform-as-a-Service background.
• Familiarity with GitLab CI/CD, self‑hosted runners, OpenTelemetry, or Datadog.
• Ephemeral‑environment, automated‑provisioning, or platform‑lifecycle experience.
• Experience in security‑sensitive, regulated, or cybersecurity environments, including startup or high‑growth settings.

Benefits and work setup

• Base salary range of $199,750-$270,000 annually, with the exact figure based on location, qualifications, and experience.
• Equity package in the form of stock options for all full‑time roles.
• Health, vision, and dental insurance for the employee and their family.
• Flexible vacation policy and generous parental leave.
• Remote and hybrid work models, with occasional travel for company onsites and team collaboration.