Senior Software Engineer, Sandboxes

This is a fully remote position, open to applicants in United Kingdom, +5 more states.

📋 Description

• Design, develop, and lead enhancements to the sandboxes product, focusing on agent integration, tool permissions, and workflows for developers.

• Analyze and address issues related to correctness, performance, and stability within the agent integration layer for macOS, Windows, and Linux platforms.

• Enhance the reliability and performance of sandbox creation, session management, and teardown processes for AI agent workloads.

• Collaborate with colleagues, Product teams, and adjacent departments to advance the architecture.

• Mentor engineers and uphold high standards during design and code reviews.

• Engage with the open-source and agentic development communities concerning sandboxing, MCP, and related ecosystems.

• Participate in on-call rotations and address critical stability issues impacting users.

• Clearly document work and disseminate knowledge within the team.

• Gain an understanding of the codebase, products, and immediate technical priorities.

• Implement minor fixes or enhancements within the first 30 days.

• Spearhead a significant improvement or feature for the local sandboxes stack within the initial 90 days.

• Influence technical direction and facilitate architecture discussions.

• Achieve measurable advancements in sandbox correctness and performance.

• Assume technical ownership of essential areas within the codebase and act as a technical leader for the local runtime.

• Assist in defining the long-term technical strategy for the filesystem layer.

⛳️ Requirements

• Over 6 years of experience in software engineering.

• Proven technical leadership on production systems at scale.

• Bachelor’s degree in Computer Science, Engineering, or a related field, or equivalent practical experience.

• Experience in developing tools for developers, desktop applications, or runtime infrastructure directly utilized by developers.

• Familiarity with the agentic software development ecosystem, including coding agents and tools like Claude Code and Codex.

• Ability to analyze isolation and security boundaries and set safe defaults.

• Experience in steering architecture and technical strategies across multiple engineers or teams.

• Excellent written and verbal communication skills.

• Comfortable working with a high level of autonomy in a remote-first setting.

• Capable of working across macOS, Windows, and Linux.

• Willingness to participate in on-call rotations.

• Visa sponsorship considered on a case-by-case basis depending on business needs.

🏝️ Benefits

• Freedom & flexibility; design your work around your life.

• Scheduled quarterly Whaleness Days and an end-of-year Whaleness break.

• Support for home office setup.

• 16 weeks of paid parental leave after six months of employment.

• Technology stipend of $100 USD net per month.

• PTO plan that encourages you to enjoy your time away from work.

• Funding for training, conferences, courses, and classes.

• Equity opportunities.

• Docker merchandise.

• Medical benefits, retirement plans, and holidays vary by country.

• Remote-first culture.