AI Sandbox Systems Engineer

scaleai; Greater London; Hybrid; GBP 110,000 - 160,000; Full time

Job summary

Scale AI is seeking a Software Engineer for the AI Infrastructure team to build and evolve our agent sandboxing platform, a secure, high-performance code execution layer powering our agentic workflows across internal and customer-managed environments.

You'll combine deep systems expertise with a focus on developer experience, collaborating with internal teams to shape a roadmap, debug issues, and deliver end-to-end architecture in a fast-paced setting.

Qualifications

• 4+ years of experience building high-performance systems software.
• Deep understanding of Linux internals: process isolation, memory management, cgroups, namespaces.
• Experience with containerisation and virtualisation technologies (Docker, Firecracker, gVisor, QEMU, Kata Containers).
• Proficiency in a systems programming language such as Go, Rust, or C/C++.

Responsibilities

• Design and build the sandboxing platform, client library, and API surface for secure code execution across containerized and virtualized environments.
• Ensure strong isolation, security, and reproducibility of execution across user sessions and workloads.
• Optimise for cold-start latency, memory footprint, and resource utilisation at scale.
• Drive down error rates through systematic debugging, monitoring, and proactive fixes.
• Partner closely with internal teams using the platform to understand their needs, debug issues, and build tooling that serves their use cases.
• Respond to incidents and production issues with urgency, conducting root cause analysis and implementing preventive fixes.
• Help develop and maintain a product roadmap for sandboxing, balancing immediate needs against long-term architectural investment.
• Lead architecture reviews and own projects end-to-end, from design through deployment, in fast-paced cross-functional settings.

Skills

High-performance systems

Linux internals

Containerisation/virtualisation

Go

Rust

C/C++

Developer experience

Kubernetes

Performance optimization

Tools

Docker

Firecracker

gVisor

QEMU

Kata Containers

Job description

Scale AI is seeking a Software Engineer for the AI Infrastructure team to build and evolve our agent sandboxing platform, a secure, high-performance code execution layer powering our agentic workflows across internal and customer-managed environments.

You'll combine deep systems expertise with a focus on developer experience, collaborating with internal teams to shape a roadmap, debug issues, and deliver end-to-end architecture in a fast-paced setting.