Staff Engineer, Sailboxes: High-Performance Cloud Sandbox

Theory Ventures; San Francisco, Northern (CA, KY); Hybrid; USD 150,000 - 230,000; Full time

Job summary

Sail is hiring a software engineer in San Francisco to help build Sailboxes, our cost-efficient CPU sandbox for long-horizon agents. You’ll work across the stack, from low-level networking to large-scale systems that improve efficiency and latency.

You will focus on performance, scalability, and reliability in a rapidly growing product line, collaborating with a small, ambitious team in a hands-on environment.

Qualifications

• Strong background in distributed systems, concurrency, networking, and databases.
• Experience with large-scale production distributed systems is preferred.
• Cloud infrastructure and container orchestration experience (multi-cloud a bonus).

Responsibilities

• Dig into our FirecrackerVM fork to maximize performance of the platform.
• Model usage patterns and implement scheduling for fleet utilization and autoscaling.
• Design highly available distributed systems handling millions of ops/sec.
• Build monitoring tooling to improve operator and user experience.

Skills

Distributed systems

Cloud infrastructure

Product-focused platform work

FirecrackerVM experience

Performance engineering

Tools

Kubernetes

Docker

GCP

AWS

Azure

Job description

Sail is hiring a software engineer in San Francisco to help build Sailboxes, our cost-efficient CPU sandbox for long-horizon agents. You’ll work across the stack, from low-level networking to large-scale systems that improve efficiency and latency.

You will focus on performance, scalability, and reliability in a rapidly growing product line, collaborating with a small, ambitious team in a hands-on environment.