Senior Engineer, Agent Runtime

rovecode; United States; Remote; USD 100,000 - 144,000; Full time

Benefits offered by this job

Remote work in Europe

Job summary

rovecode is seeking a runtime engineer to own the local runtime that carries out an agent’s tool calls, supervises processes, and records sessions across Windows, macOS, and Linux.

You will design policy layers and define clear limits between requested actions and machine execution, ensuring consistent runtime behavior with comprehensive CI coverage. This remote, Europe-based role involves reviewing peers, contributing code, and shipping robust tooling for local deployments.

Qualifications

• Experience shipping locally runnable software (CLI/build tool/agent).
• Strong TypeScript background with Bun or Node.js.
• Ability to reason about action boundaries on a machine.
• Excellent written English for design notes.

Responsibilities

• Design and ship runtime policy layers, including a possible capability model for MCP servers, and document their limits.
• Make behavior consistent across Windows, macOS, and Linux, with CI coverage on all three platforms.
• Design an append-only session log that supports rewinds, checkpoints, and exports without unnecessary cost.
• Review the work of other runtime engineers and take part in peer review.
• Work directly in the runtime code when documentation does not answer implementation questions.

Skills

TypeScript

Bun/Node.js

CLI tooling

CI automation

Cross-OS testing

Job description

Role overview

Own the local runtime that carries out an agent’s tool calls, supervises processes, and records sessions. The work centers on defining clear limits between an agent’s requests and actions performed on a user’s machine, while keeping runtime behavior consistent across major desktop operating systems.

Responsibilities

• Design and ship runtime policy layers, including a possible capability model for MCP servers, and document their limits.
• Make behavior consistent across Windows, macOS, and Linux, with CI coverage on all three platforms.
• Design an append-only session log that supports rewinds, checkpoints, and exports without unnecessary cost.
• Review the work of other runtime engineers and take part in peer review.
• Work directly in the runtime code when documentation does not answer implementation questions.

Requirements

• Extensive practical TypeScript experience, ideally with Bun or Node.js.
• A track record of shipping software that other engineers run locally, such as a CLI, build tool, or agent.
• Ability to reason carefully about the boundary between requested actions and what a machine actually executes.
• Strong written English for design notes that communicate decisions clearly.
• Comfort working across Windows, macOS, and Linux and proving behavior through automated CI.

Benefits and work setup

• Remote role based in Europe.
• The hiring process includes a short introduction and work samples, a team conversation, a paid take-home exercise expected to take an afternoon, and a final conversation. The process is intended to take about two weeks, with replies at each stage.