Software Engineer, Open Source

crewAI, Inc.; San Francisco, Northern (CA, KY); Hybrid; USD 140,000 - 210,000; Full time

Job summary

CrewAI is seeking a senior Python engineer to be a core maintainer of the open-source framework. You will shape API decisions, review PRs, and ensure high-quality, backward-compatible changes across a broad developer base.

You’ll document, mentor contributors, and collaborate across teams to keep the OSS-to-enterprise boundary coherent while maintaining fast velocity.

Qualifications

• 7+ years of Python engineering with library/framework shipping.
• Strong API design skills and great DX for developers.
• Experience with open-source projects and public discussion.
• Familiarity with modern Python toolchain: pytest, type hints, pre-commit.
• Knowledge of LLM concepts or willingness to learn quickly.
• Ability to thrive in a fast-growing, public feedback environment.

Responsibilities

• Design, build, and maintain core framework capabilities for orchestration and APIs.
• Triage PRs, mentor contributors, and manage issue backlogs in public view.
• Document API changes with backward compatibility and migration paths.
• Ensure clean, well-tested Python code and green CI across changes.
• Write docs, examples, and guides to help developers succeed.
• Collaborate with runtime engineers to align OSS and enterprise needs.

Skills

Python

API design

Open-source

LLMs

Type hints

CI/CD

Tools

pytest

uvicorn

Job description

About CrewAI

CrewAI is the leading framework and enterprise platform for building and orchestrating multi-agent AI systems. The open-source framework is a lean, fast Python library that has grown to 53k+ GitHub stars, 7.4k+ forks, and 100k+ developers certified through our community courses. It is rapidly becoming the standard for production-grade agentic automation powering hundreds of millions of agentic executions a month. This role is about building that framework in the open.

The Role

You'll be a core maintainer of the CrewAI open-source framework: the Crews and Flows APIs that hundreds of thousands of developers build on. This is engineering done in public. Your design decisions, code reviews, and API choices are visible to a large community and ripple out to everyone building on the platform.

You'll balance velocity with the long-term stewardship a widely adopted open-source project demands, and you'll treat developer experience as a first-class product.

What You'll Do

• Design, build, and maintain core framework capabilities: agent orchestration, agent harness, Flows, task execution, tools, memory, MCP, A2A, and the public APIs developers depend on.
• Own the contributor experience: triage and review community PRs and issues, mentor contributors, and keep the bar high without killing momentum.
• Make and document API and DX decisions with backward compatibility and migration paths in mind. Changes here affect a very large installed base.
• Uphold engineering quality in the open: clean, well-tested Python, strong typing, and green CI on every change.
• Write and improve documentation, examples, and guides that help developers succeed quickly.
• Partner with runtime and platform engineers to keep the OSS-to-enterprise boundary coherent, and reconcile versioning so framework changes do not break downstream enterprise consumers.
• Engage the community directly through GitHub Discussions, forums, Discord, and other channels, turning real usage and feedback into roadmap signal.

What We're Looking For

• 7 plus years of Python engineering background, with a track record of shipping and maintaining library or framework code, not just application code.
• Genuine care for API design and developer experience. You've felt the difference between an API that's pleasant and one that isn't, and you can articulate why.
• Experience contributing to or maintaining open-source projects: reviewing external PRs, managing issue backlogs, and communicating decisions in public.
• Familiarity with the modern Python toolchain: uv, pytest, type hints, pre-commit, and well-tested code.
• Working knowledge of LLMs and agent concepts, or the appetite and ability to come up to speed fast.
• Comfort with the pace, ambiguity, and public feedback loops of an early-stage, high-growth environment.

We are unable to provide immigration sponsorship for this role. Applicants must have existing authorization to work in the U.S.