Senior Infrastructure Engineer

Stack

Responsibilities

• ▹Own the day-to-day reliability of the production platform: keep EKS, ArgoCD and the AWS surface area stable, tune autoscaling, and handle incidents so each one teaches something new.
• ▹Build progressive delivery with Argo Rollouts and clean rollback paths, so a bad deploy can be reverted within seconds to minutes.
• ▹Build developer tools as products: evolve the local development environment, BIBEs (per-PR full-stack staging deployments) and CLI tooling so the inner loop stays fast and friendly to parallel AI agents.
• ▹Reduce operational toil with AI by automating low-risk workflows end to end.
• ▹Keep the stack current: upgrade application runtimes (Node.js, Python), Kubernetes, EKS, Helm and the Terraform-managed surface, and own infra-side security vulnerabilities.
• ▹Improve the economics of the platform: lead visibility work on Datadog, AWS rightsizing and log filters so observability and cloud spend grow slower than the company.
• ▹Partner with EPD (Buffer's unified Engineering, Product and Design team): documentation, weekly security work and shared ownership of infrastructure. On-call is distributed across all engineers, a week-long shift roughly once a quarter.

Requirements

• ▹Enough experience as an Infrastructure Engineer, SRE, DevOps or adjacent role to be considered senior.
• ▹Hands-on experience operating production Kubernetes at scale on a managed offering (GKE, EKS, AKS), including authoring Helm charts, and fluency with KEDA and the cluster autoscaler.
• ▹AWS depth across IAM, EC2, S3, SQS, ECR and ALBs.
• ▹Strong Terraform skills with modular, readable, self-contained code.
• ▹Production CI/CD with GitHub Actions (or equivalent) and GitOps via ArgoCD, including canary or progressive delivery systems.
• ▹Experience building internal developer tools (CLIs, dev environments, per-PR environments) and treating them as products.
• ▹A track record of pragmatic build-vs-buy decisions on infrastructure tooling.
• ▹Experience with DataDog, Sentry or similar observability stacks, designing logs and metrics with cost in mind.
• ▹Comfort with Cloudflare (Workers, Zero Trust, DNS).
• ▹Ability to read and modify TypeScript or Node services to upgrade runtimes (legacy PHP and Python show up too).
• ▹Fluency with modern AI tools for debugging, documenting and reducing toil.
• ▹A proactive, follow-through mindset; you turn ambiguous asks into rough proofs of concept and iterate.
• ▹Comfort working in remote, asynchronous environments.

Nice to have

• ▹A contributed open-source Terraform module.
• ▹Experience with Cloudflare and GCP (BigQuery).
• ▹Open-source contributions, a technical blog, conference talks or side projects.
• ▹Developer-facing tooling you have shipped (APIs, SDKs, CLIs, MCP servers) where adoption was the success metric.

Soft skills

About the company

Buffer creates social media and brand-building software for small businesses, creators and individuals. It is a fully distributed team that defaults to transparency, and a profitable company that is 15 years old.