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Software Engineer (Ray Core)

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Anyscale

Technology

Software Engineer (Ray Core)

San Francisco
On-site
Full-time
Posted Sep 3, 2026
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Engineering
On-site

About Anyscale:

At Anyscale, we're on a mission to democratize distributed computing and make it accessible to software developers of all skill levels. We’re commercializing Ray, a popular open-source project that's creating an ecosystem of libraries for scalable machine learning. Companies like OpenAI, Uber, Spotify, Instacart, Cruise, and many more, have Ray in their tech stacks to accelerate the progress of AI applications out into the real world.

With Anyscale, we’re building the best place to run Ray, so that any developer or data scientist can scale an ML application from their laptop to the cluster without needing to be a distributed systems expert.

Proud to be backed by Andreessen Horowitz, NEA, and Addition with $250+ million raised to date.

About the role

Ray aims to provide a universal API for building distributed applications. To achieve this goal requires a distributed system with high levels of performance and reliability. We're looking for engineers with systems software experience that are interested in contributing to the Ray backend.


About the Ray Core Team

The Ray Core team develops and maintains the Ray C++ backend (e.g., distributed scheduler, language runtime integration, I/O and memory subsystems). We are responsible for the reliability, scalability, and performance of Ray as well as ensuring that Ray provides the right feature set to support higher level libraries and use cases. The team works on a balance of new features / distributed libraries, test infra improvements, debugging, and longer-term architectural improvements to Ray.

A snapshot of projects you can work on:

  • Optimizing performance of large-scale workloads on Ray

  • Stability and stress testing infrastructure

  • Improving fault tolerance (HA)

As part of this role, you will:

  • Leading cross-team projects while mentoring junior team members

  • Develop high quality open source software to simplify distributed programming (Ray)

  • Identify, implement, and evaluate architectural improvements to Ray core

  • Improve the testing process for Ray to make releases as smooth as possible

  • Communicate your work to a broader audience through talks, tutorials, and blog posts

We'd love to hear from you if you have:

  • At least 5 year of relevant work experience

  • Experience in building scalable and fault-tolerant distributed systems

  • Extensive experience working in C/C++ and on low level operating systems

  • Solid background in algorithms, data structures, system design

  • Knowledge of distributed model training and inference (e.g. tensor parallel, pipeline parallel) is preferred

  • Knowledge of GPU programming is preferred

Anyscale Inc. is an Equal Opportunity Employer. Candidates are evaluated without regard to age, race, color, religion, sex, disability, national origin, sexual orientation, veteran status, or any other characteristic protected by federal or state law. 


Anyscale Inc. is an E-Verify company and you may review the Notice of E-Verify Participation and the Right to Work posters in English and Spanish

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Anyscale

Company profile

What do OpenAI, Uber, and Instacart have in common? They all use Ray, open-source software built by Anyscale that’s used to scale up AI models. The company, which emerged from a research lab at UC Berkeley, enables users to easily scale Python code and create custom apps without becoming experts in distributed computing. It was founded by Cofounder Robert Nishihara, CTO Philipp Moritz, and executive chairman — and Databricks cofounder — Ion Stoica. The company has raised $259 million and has a valuation of $1.1 billion. Recently, the company announced an update to warn users if Ray was configured to be accessible on the open internet after security researchers found that hackers had installed crypto-miners on some users’ AI servers, as Forbes reported.

View Anyscale

Headquarters

San Francisco, California, United States

Team size

500

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