Engineering Manager

CoreWeave is The Essential Cloud for AI™. Built for pioneers by pioneers, CoreWeave delivers a platform of technology, tools, and teams that enables innovators to build and scale AI with confidence. Trusted by leading AI labs, startups, and global enterprises, CoreWeave combines superior infrastructure performance with deep technical expertise to accelerate breakthroughs and turn compute into capability. Founded in 2017, CoreWeave became a publicly traded company (Nasdaq: CRWV) in March 2025. Learn more at  www.coreweave.com .

About the Team

The marimo team develops marimo, an open-source reactive computational notebook for Python. Initially incubated with scientists at Stanford, marimo is now used by leading companies, labs, and universities around the world, with millions of monthly downloads and over 20,000 stars on our GitHub repository . The team also develops open-source extension packages and molab , a rapidly growing cloud-hosted notebook service. These efforts reinforce each other: improvements to the open-source notebook make molab better, while lessons from operating molab inform development of the open-source projects.

About the Role

We are seeking an Engineering Manager to lead the marimo team across the open-source ecosystem and molab. You will mentor engineers, provide regular feedback, and help develop their careers, while also helping hire and onboard new teammates.

You will be responsible for team execution, release cadence, software quality, and responsiveness to users. Across the open-source projects, you will help the team ship improvements rapidly and safely while keeping the projects maintainable and responsive to the needs of our diverse users. For molab, you will help the team deliver a reliable service and a high-quality product experience. 

You will shape engineering priorities and technical direction, lead team execution, and strengthen cross-functional collaboration as the team grows. A central part of this role is guiding investment across the open-source marimo ecosystem and molab to help the team achieve its primary goal: making marimo an open-source standard across industry, research, and education. 

Key Responsibilities: Bullet of responsibilities, scope, ownership, etc

Lead engineering execution across marimo’s open-source ecosystem and molab, including project staffing, technical planning, dependency management, and release delivery

Manage and mentor engineers, support their career development, strengthen their technical judgment and ownership, and help hire and onboard new teammates

Shape architecture and technical direction with engineers, reviewing designs and guiding tradeoffs among maintainability, correctness, extensibility, performance, and development speed

Evaluate community feature requests with care, balancing user needs, long-term maintainability, and marimo’s product principles

Lead improvements to engineering productivity and software quality, including CI/CD pipelines, automated testing, code review, and release processes

Establish clear ownership and practices for molab’s production reliability, including observability, incident response, capacity planning, and resolution of recurring failures

Ensure the team has effective practices for API design, testing, releases and hotfixes, issue triage, and review of community contributions across marimo’s open-source projects

Qualifications: Bullet of technical and measurable requirements of the role 

5+ years of software engineering experience

2+ years of engineering management experience leading senior engineers and technical leads

Proficient in Python, with strong fundamentals that are language agnostic

Experience contributing to open-source projects

Technical depth to lead design and architecture reviews and evaluate tradeoffs involving APIs, state management, scalability, security, and reliability

Experience improving engineering practices, including automated testing, CI/CD, and cod …