Job Description
[What is marimo]
At marimo we’re on a mission to make the world’s best open-source programming environment for working with data together with a world-class scalable and performant cloud-hosted counterpart. marimo is a reinvention of the Python notebook — it feels like a next-gen reactive Python notebook but is stored as pure Python that can be versioned with Git deployed as a data app run as a script and reused as a module. Incubated initially with scientists at Stanford marimo is now used by leading companies labs and universities around the world with millions of downloads since launch and over 17000 stars on our GitHub repository.
On the marimo team we believe that the tools we use shape the way we think — better tools for better minds. If you're passionate about developer tools thrive in ambiguity enjoy solving challenging engineering problems at scale and yearn for greenfield problems you'll fit right in.
[Description of the Team]
The marimo core open source team develops and maintains the marimo open source notebook. Today 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.
About the role:
As a senior software engineer on marimo's core open source team you’ll take ownership of projects across marimo's open-source ecosystem focusing on marimo's backend and its Python ecosystem. You will influence critical decisions on library design making sure our APIs remain simple yet composable; you'll also design new capabilities that push the boundaries of interactive computing without complicating the user experience. 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 our own roadmap and vision.
Who You Are:
- 4+ years of experience in software engineering
- Proficiency in Python with strong fundamentals that are language agnostic
- Proficiency in computer systems including parallel computing (threading multiprocessing) concurrency (asynchronous programming) basic networking/inter-process communication
- Experience in library design and/or open-source development
- Strong communication skills written and verbal
Preferred:
- 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 Typescript or a willingness to learn
- Experience with AI engineering including MCP and agents
- Experience with SQL databases and data engineering
- Experience with at least one systems language such as C or Rust
Wondering if you’re a good fit? We believe in investing in our people and value candidates who can bring their own diversified experiences to our teams – even if you aren't a 100% skill or experience match. Here are a few qualities we’ve found compatible with our team. If some of this describes you we’d love to talk.
- You love crafting developer tools especially for AI ML or data
- You’re curious about the day-to-day work of AI/ML/data engineers researchers and scientists
- You enjoy building in the open and engaging with your users
The base salary range for this role is $165000 to $242000. The starting salary will be determined based on job-related knowledge skills experience and market location. We strive for both market alignment and internal equity when determining compensation. In addition to base salary our total rewards package includes a discretionary bonus equity awards and a comprehensive benefits program (all based on eligibility).
What We Offer
The range we’ve posted represents the typical compensation range for this role. To determine actual compensation we review the market rate for each candidate which can include a variety of factors. These include qualifications experience interview performance and location.
In addition to a competitive salary we offer a variety of benefits to support your needs including:
- Medical dental and vision insurance - 100% paid for by CoreWeave
- Company-paid Life Insurance
- Voluntary supplemental life insurance
- Short and long-term disability insurance
- Flexible Spending Account
- Health Savings Account
- Tuition Reimbursement
- Ability to Participate in Employee Stock Purchase Program (ESPP)
- Mental Wellness Benefits through Spring Health
- Family-Forming support provided by Carrot
- Paid Parental Leave
- Flexible full-service childcare support with Kinside
- 401(k) with a generous employer match
- Flexible PTO
- Catered lunch each day in our office and data center locations
- A casual work environment
- A work culture focused on innovative disruption
Our Workplace
While we prioritize a hybrid work environment remote work may be considered for candidates located more than 30 miles from an office based on role requirements for specialized skill sets. New hires will be invited to attend onboarding at one of our hubs within their first month. Teams also gather quarterly to support collaboration.
California Consumer Privacy Act - California applicants only
CoreWeave is an equal opportunity employer committed to fostering an inclusive and supportive workplace. All qualified applicants and candidates will receive consideration for employment without regard to race color religion sex disability age sexual orientation gender identity national origin veteran status or genetic information.
As part of this commitment and consistent with the Americans with Disabilities Act (ADA) CoreWeave will ensure that qualified applicants and candidates with disabilities are provided reasonable accommodations for the hiring process unless such accommodation would cause an undue hardship. If reasonable accommodation is needed please contact: [email protected].
Export Control Compliance
This position requires access to export controlled information. To conform to U.S. Government export regulations applicable to that information applicant must either be (A) a U.S. person defined as a (i) U.S. citizen or national (ii) U.S. lawful permanent resident (green card holder) (iii) refugee under 8 U.S.C. § 1157 or (iv) asylee under 8 U.S.C. § 1158 (B) eligible to access the export controlled information without a required export authorization or (C) eligible and reasonably likely to obtain the required export authorization from the applicable U.S. government agency. CoreWeave may for legitimate business reasons decline to pursue any export licensing process.
Top Skills
What the Team is Saying
What We Do
CoreWeave the AI Hyperscaler™ delivers a cloud platform of cutting-edge software powering the next wave of AI. The company's technology provides enterprises and leading AI labs with cloud solutions for accelerated computing. Since 2017 CoreWeave has operated a growing footprint of data centers across the US and Europe. CoreWeave was ranked as one of the TIME100 most influential companies and featured on Forbes Cloud 100 ranking in 2024. Learn more at www.coreweave.com.
Why Work With Us
At CoreWeave we work hard have fun and move fast! Today we are a small growing team of intelligent genuine people that value different perspectives and approaches to solving complex problems. We foster an environment that champions collaboration and prioritizes innovative solutions. Here you are surrounded by the best.
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Date Posted
04/02/2026
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