Sail Research
Member of Technical Staff - Sailboxes
San Francisco · On-site · Staff · Full-time · Posted Aug 27, 2026
About the job
Build and optimize Sailboxes, a cost-efficient CPU sandbox platform for hosting long-horizon AI agents at scale.
What you'll do
- Optimize Sail’s custom FirecrackerVM fork and networking for performance.
- Develop usage modeling, scheduling, autoscaling, and highly available distributed systems to improve fleet utilization and minimize latency.
- Build monitoring and user-facing features, and help shape future Sailboxes products.
What they ask for
- Strong distributed systems fundamentals, including concurrency, networking, databases, and performance engineering.
- Experience with cloud infrastructure (GCP, AWS, Azure), container orchestration, and/or multi-cloud networking.
- Product-focused approach to platform work, with an emphasis on robust, scalable, ergonomic solutions.
Nice to have
- Experience building and maintaining software for large-scale production distributed systems.
- Experience with FirecrackerVMs.
Tools
FirecrackerVMs, GCP, AWS, Azure
AI focus
Build and optimize CPU sandboxes and agent runtime infrastructure for hosting AI agents at scale.
Model-written summary · the original posting is authoritative