Remote MCP CLI Development Intern—Governed Agent Tools

CaelumenAI; San Francisco (CA); On-site; USD 25,000 - 40,000; Full time

Job summary

Caelumen is seeking an MCP CLI Development Engineer Intern to contribute to the PERCO CLI and MCP integration surface. You will own small, real product slices across command design, client integration, reliability, documentation, and verification—from scoped problems to implementation and evidence-backed handoffs.

This remote-first internship offers mentorship and ownership over end-to-end engineering tasks, with flexible collaboration and the option to work from San Francisco.

Qualifications

• Proficiency in JavaScript, TypeScript or Python and Git.
• Familiarity with web or API fundamentals.

Responsibilities

• Build and improve the PERCO CLI and MCP connection workflow for coding clients.
• Design clear, reliable command flows for login, project linking, MCP installation, configuration, and recovery from errors.
• Implement and test developer-facing integrations across supported coding clients and real project environments.
• Make tool contracts predictable: explicit limits, safe inputs, and actionable error messages.
• Automate repeatable checks with unit and integration tests, Playwright, logs, and release evidence.
• Investigate failures to root cause and ship durable fixes with regression coverage.

Skills

JavaScript

TypeScript

Python

Git

Web fundamentals

API fundamentals

Job description

Caelumen is seeking an MCP CLI Development Engineer Intern to contribute to the PERCO CLI and MCP integration surface. You will own small, real product slices across command design, client integration, reliability, documentation, and verification—from scoped problems to implementation and evidence-backed handoffs.

This remote-first internship offers mentorship and ownership over end-to-end engineering tasks, with flexible collaboration and the option to work from San Francisco.