Senior Software Engineer, Frontend/Fullstack

marimo • New York, NY

8d

About The Position

The marimo core open source team develops and maintains the marimo open source notebook. This includes the marimo editor frontend, the marimo backend which includes the core dataflow compiler and runtime, an intermediary server, the marimo library, and an ecosystem of related projects, such as a VS Code extension, codemirror extensions, and more. This team has the crucial role of shepherding the future of one of Python's fastest growing and most impactful open-source projects. As a senior software engineer on marimo's core open source team, you’ll take ownership of projects across marimo's open-source ecosystem, with an emphasis on marimo's frontend, servers, and editor extensions (such as VS Code and Cursor). You will design delightful and powerful interactive experiences in the marimo editor, while making sure that the user interface remains simple; you will also lead building scalable and performant data visualizations, a robust code editing experience, and other related tasks. You'll work in the open, at a fast pace — engaging promptly and empathetically with a large and vocal community of users and contributors, triaging their issues and reading between the lines to understand their unstated needs. All the while, you'll exercise judgment to balance the needs of our community with the team's roadmap, opinionated vision, and taste.

Requirements

• 4+ years of experience in software engineering
• Proficiency in Typescript, strong fundamentals that are language agnostic
• Experience building modern React applications
• Strong communication skills, written and verbal

Nice To Haves

• A passion for and experience building developer tools, especially for AI, ML, or data
• A passion for working with data, with the ability to empathize with practitioners and researchers in AI, ML, data engineering, NLP, or other quantitative work
• An eye for visual and interaction design, with an emphasis on simplicity
• You find enjoyment in connecting with users and community daily
• Proficiency in Python, or a willingness to learn
• Experience with AI engineering, including MCP and agents
• Experience with SQL, databases, and data engineering
• Experience working on open-source projects

Responsibilities

• Take ownership of projects across marimo's open-source ecosystem, with an emphasis on marimo's frontend, servers, and editor extensions (such as VS Code and Cursor).
• Design delightful and powerful interactive experiences in the marimo editor, while making sure that the user interface remains simple.
• Lead building scalable and performant data visualizations, a robust code editing experience, and other related tasks.
• Engage promptly and empathetically with a large and vocal community of users and contributors, triaging their issues and reading between the lines to understand their unstated needs.
• Exercise judgment to balance the needs of our community with the team's roadmap, opinionated vision, and taste.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed