Senior Software Engineer, Sandboxes

Accountabilities

• Lead sandbox product development: Design, develop, and drive improvements across agent integration, tool permissions, and developer-facing workflows.
• Build secure runtime infrastructure: Develop and evolve isolated microVM-based environments with strong security boundaries, safe defaults, and reliable execution for AI agent workloads.
• Improve cross-platform reliability: Investigate and resolve correctness, performance, and stability issues across macOS, Windows, and Linux.
• Optimize sandbox lifecycle management: Improve the reliability, performance, and scalability of sandbox creation, session management, execution, and teardown.
• Drive architecture and technical strategy: Collaborate with engineering peers, Product, and adjacent teams to evolve system architecture as product and technical requirements grow.
• Provide technical leadership: Set high standards through design reviews, code reviews, technical decision-making, and mentorship of other engineers.
• Engage with the developer ecosystem: Participate in open-source projects and relevant communities around sandboxing, MCP, AI agents, and emerging agentic development technologies.
• Own production reliability: Participate in on-call rotations and respond to critical stability or performance issues affecting users.
• Document and communicate effectively: Produce clear technical documentation and share knowledge across the team and broader engineering organization.
• Shape long-term technical direction: Help define the future architecture of the local runtime and filesystem layers while aligning technical strategy with product and business priorities.
• Drive measurable improvements: Deliver tangible gains in sandbox correctness, performance, reliability, and developer experience over time.

Requirements

• 8+ years of software engineering experience, including demonstrated technical leadership on production systems operating at scale.
• Bachelor’s degree in Computer Science, Engineering, or a related discipline, or equivalent practical experience.
• Experience building developer tools, desktop applications, runtime infrastructure, or comparable systems used directly by developers.
• Strong understanding of the agentic software development ecosystem, including how coding agents operate and interact with tools and their execution environments.
• Experience with technologies or systems involving containers, virtual machines, sandboxes, isolated runtimes, or secure execution environments.
• Strong ability to reason about security and isolation boundaries, including what a sandbox should expose, what it should restrict, and how to establish secure-by-default behavior.
• Demonstrated experience driving architecture and technical strategy across multiple engineers or teams.
• Strong technical judgment and the ability to navigate complex, ambiguous problems spanning multiple systems and components.
• Excellent written and verbal communication skills, with the ability to build clarity and consensus across technical and cross-functional stakeholders.
• Strong product mindset and interest in understanding how infrastructure decisions affect developers and end users.
• Comfortable working with a high degree of autonomy in a globally distributed, remote-first environment.
• Willingness to participate in on-call responsibilities and take ownership of production reliability.

Benefits

• US compensation of $160,900–$260,700 plus equity, depending on relevant factors and location.
• Equity participation, providing employees with an opportunity to share in the organization’s growth.
• Freedom and flexibility to structure work around your life.
• Remote-first work environment, with offices available in Seattle and Paris.
• Dedicated quarterly wellness days and an end-of-year wellness break.
• Home office setup to support a comfortable and productive remote workspace.
• 16 weeks of paid parental leave after six months of employment.
• Technology stipend equivalent to $100 USD net per month.
• PTO plan designed to encourage meaningful time away from work.
• Training stipend for conferences, courses, and classes.
• Medical benefits, retirement programs, and holidays, with offerings varying by country.
• Company merchandise and additional employee perks.
• Visa sponsorship may be considered on a case-by-case basis, depending on business needs.