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PostHog · 1 day ago

Infrastructure Engineer — Sandbox Platform

United States

Full-time

Remote

Mid, Senior Level

3+ years exp

PostHog is a company focused on providing essential tools for businesses to run efficiently from their inception to IPO. They are seeking an Infrastructure Engineer to design and implement a secure and high-performance sandbox platform, which will be foundational for new products and data workloads.

AnalyticsDeveloper PlatformDeveloper ToolsOpen SourceSoftware Engineering

Responsibilities

Design and Implement the Sandbox Platform: Be the primary engineer responsible for building the core sandbox infrastructure. This includes API design, backend logic, and the underlying orchestration

Enforce Hard Isolation: Design and implement mechanisms to run user-provided code and data workloads with strong security and performance isolation on tech (platforms?) like Kata Containers on Kubernetes (k8s) (though we’re open to better systems if you have a preference)

Enable Core Products: The sandboxes will eventually power: - Our new DuckDB-based data warehouse product https://posthog.com/data-stack/managed-warehouse - Data science notebooks - PostHog AI https://posthog.com/ai sandboxes

Manage performance and costs: Ensure the sandbox environments are highly performant, auto-scaling, and cost-efficient to run at PostHog scale

Qualification

Infrastructure expertiseKubernetesBackend engineeringSecurity & isolationPythonGoRustSelf-directionAPI designCost optimizationMulti-tenancy

Required

Infrastructure expertise: 3+ years of experience designing, deploying, and maintaining high-availability, high-performance infrastructure

Kubernetes chops: Deep, hands-on experience with production k8s environments. You should be comfortable extending k8s or interacting with its APIs at a low level

Backend engineering: Strong experience with our core backend language (Python/Django) or similar languages (Go, Rust) in a high-scale environment. Experience building and documenting robust APIs

Security & isolation: Experience with container runtime security, virtual machine isolation, and multi-tenancy challenges. You understand the difference between process and kernel isolation

Self-direction: Given this is a greenfield project, you thrive on ambiguity, can quickly prototype solutions, and can independently drive a technical vision from concept to production