Senior Software Engineer, Sandboxes

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Software Engineer, Sandboxes based in the United States. This is a senior engineering role focused on building secure, isolated runtime environments that enable AI coding agents to work safely and autonomously. You’ll help shape sandbox infrastructure that gives agents the freedom to execute real development tasks without compromising the developer’s host environment. The role spans runtime architecture, security boundaries, agent integration, performance, reliability, and developer-facing workflows. You’ll work across macOS, Windows, and Linux while solving challenging infrastructure problems at the intersection of AI and developer tooling. The position offers significant technical ownership, influence over architecture, and opportunities to shape an emerging product area. You’ll collaborate closely with engineering, product, open-source communities, and adjacent teams in a globally distributed environment. This role is particularly well suited to an experienced engineer who enjoys ambiguous problems, technical leadership, and building infrastructure used directly by developers.