Engineering Manager

CoreWeave•Sunnyvale, CA

7d•Onsite

About The Position

CoreWeave is seeking an Engineering Manager to lead the marimo team, which develops the open-source reactive computational notebook for Python (marimo), its extension packages, and molab, a cloud-hosted notebook service. The role involves mentoring engineers, managing team execution, release cadence, software quality, and user responsiveness. The manager will shape engineering priorities and technical direction, foster cross-functional collaboration, and guide investment across the open-source ecosystem and molab to establish marimo as an industry standard. The team is experiencing hyper-growth and offers opportunities for learning and innovation.

Requirements

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 code review
Experience owning production services end to end, including performance under load, availability targets, on-call rotations, and incident response
Experience identifying if processes help or hinder a team and establishing clear, documented workflows that support its growth
Strong communication skills, written and verbal

Nice To Haves

Experience maintaining and growing a widely used open-source project
Experience building developer tools, especially for AI, ML, or data
A passion for working with data and empathy for practitioners and researchers who use computational tools like notebooks.
Familiarity with observability platforms (Prometheus, Grafana, alerting systems), Kubernetes, and modern CI/CD practices
Experience using AI to accelerate engineering processes
Enjoy connecting regularly with users and contributors and translating their feedback into product and engineering improvements

Responsibilities

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.