Site Reliability Engineer (US - Pacific time)

PostHog is a product development platform that combines product analytics, AI development tools, data warehousing, and AI-powered analysis. The Site Reliability Engineer will own and automate production infrastructure across a large, stateful, multi-region AWS platform, operating Kubernetes clusters, managing infrastructure as code, improving reliability tooling, optimizing costs, and participating in incident response.

Responsibilities:

• Operating EKS clusters across several environments with Karpenter autoscaling, Cilium networking, and ArgoCD-driven GitOps deployments
• Managing and evolving a multi AWS account organization, provisioning, networking, access control, and cross-account connectivity
• Maintaining the Terraform/Terragrunt IaC platform - modules, automated plan-on-PR / apply-on-merge pipelines, and safe patterns for shared infrastructure
• Improving operational tooling around deploys, schema changes, backups, restores, and incident response
• Reducing operational load by identifying repeat pain points and eliminating them through code and self-healing automation
• Optimizing cloud spend as you go
• Participating in on-call and incident response, with a strong focus on making incidents rarer over time

Requirements:

• Experience: 6+ years
• Visa: US citizen/visa only
• In general we seek SRE's who are:
• • Enthusiastic drivers. We need proactive people that can fully own projects and get them done, and know to get help when needed. "Are we there yet?" is the wrong question
• • Optimistic problem solvers. Things get hard here sometimes, whether it's scaling, shipping complex products, handling a stream of support requests, or trying to ship something that touches multiple teams. We need people who won't get disheartened, and will collaborate, iterate, and ship their way out of anything
• • Grown ups. We're an international bunch of weirdos, but one thing unites us: everyone is kind, considerate, and professional towards each other.This isn't about age or experience, it's about being low-ego, flexible, and respectful
• • Genuine builders. PostHog is full of people who just love building stuff, people who would still be building software even if there wasn't a paycheck at the end. If this sounds like you, we should talk
• Strong experience operating production infrastructure on AWS. Not just one account, but understanding organizational boundaries, IAM, and networking between many
• Experience automating infrastructure using Terraform or Terragrunt at scale, including module design and state management
• Solid understanding of Linux systems (disk, memory, networking, failure modes)
• Experience supporting stateful systems (databases, queues, storage systems, etc.)
• Ability to debug and reason about performance and reliability issues in production
• You're comfortable owning systems end-to-end, including on-call responsibilities
• Deep hands-on experience with Kubernetes in production (EKS preferred). You've debugged node pressure, networking issues, and deployment failures at scale (thousands of nodes)
• Experience with GitOps workflows (ArgoCD) and CI/CD pipelines (GitHub Actions)
• Experience with building AI agent-enabled base-level infra services for teams that move fast
• Familiarity with multi-region infrastructure and the consistency/availability tradeoffs that come with it