Site Reliability Engineer (Cloud Foundations Team)

Company: PostHog

Job Category: Site Reliability Engineering / Platform / AWS / Kubernetes

Contract Type: Full-Time, Permanent Location: Remote — Americas (GMT -3 to GMT -8)

Salary: Location-adjusted via public calculator; open to exceeding ranges for top talent

Application Link: https://posthog.com/careers/site-reliability-engineer

Posted: Live as of May 14, 2026

Job Description: This is not a keep-the-lights-on SRE role. You'll turn a fast-growing, stateful system processing petabytes of data across thousands of cores into a predictable, well-automated platform. The work is about designing safe automation for traffic-heavy workloads, reducing operational stress, and building the tooling that lets the system scale without scaling human effort.

Key Responsibilities:

• Operate EKS clusters across multiple environments with Karpenter autoscaling, Cilium networking, and ArgoCD-driven GitOps deployments
• Manage and evolve a multi-AWS account organization — provisioning, networking, access control, cross-account connectivity
• Maintain the Terraform/Terragrunt IaC platform including modules, automated plan-on-PR/apply-on-merge pipelines
• Improve operational tooling around deploys, schema changes, backups, restores, and incident response
• Reduce operational load by identifying repeat pain points and eliminating them through code and self-healing automation
• Optimize cloud spend continuously
• Participate in on-call and incident response, with a strong focus on making incidents rarer over time
• Build AI agent-enabled infrastructure services using LLM tooling to automate alert management and observability

Requirements:

• Deep hands-on Kubernetes production experience (EKS preferred), including debugging node pressure, networking issues, and deployment failures at scale (thousands of nodes)
• Strong AWS infrastructure experience across multi-account organizations, IAM, and cross-account networking
• Experience automating infrastructure with Terraform or Terragrunt at scale including module design and state management
• Solid Linux systems knowledge: disk, memory, networking, failure modes
• Experience supporting stateful systems (databases, queues, storage)
• Comfortable owning systems end-to-end including on-call responsibilities

Nice to have: GitOps with ArgoCD; multi-region infrastructure experience; AI-enabled infra services.