Staff Software Engineer, Performance- Weights & Biases

CoreWeave, the AI Hyperscaler™, acquired Weights & Biases to create the most powerful end-to-end platform to develop, deploy, and iterate AI faster. Since 2017, CoreWeave has operated a growing footprint of data centers covering every region of the US and across Europe, and was ranked as one of the TIME100 most influential companies of 2024. By bringing together CoreWeave’s industry-leading cloud infrastructure with the best-in-class tools AI practitioners know and love from Weights & Biases, we’re setting a new standard for how AI is built, trained, and scaled.
The integration of our teams and technologies is accelerating our shared mission: to empower developers with the tools and infrastructure they need to push the boundaries of what AI can do. From experiment tracking and model optimization to high-performance training clusters, agent building, and inference at scale, we’re combining forces to serve the full AI lifecycle — all in one seamless platform.

Weights & Biases has long been trusted by over 1,500 organizations — including AstraZeneca, Canva, Cohere, OpenAI, Meta, Snowflake, Square,Toyota, and Wayve — to build better models, AI agents and applications. Now, as part of CoreWeave, that impact is amplified across a broader ecosystem of AI innovators, researchers, and enterprises.

As we unite under one vision, we’re looking for bold thinkers and agile builders who are excited to shape the future of AI alongside us. If youre passionate about solving complex problems at the intersection of software, hardware, and AI, theres never been a more exciting time to join our team.
Performance Engineering

at Weights & Biases ensures our systems and products scale seamlessly as usage grows. We embed performance thinking into every stage of development—diagnosing issues, designing scalable patterns, and building tools that empower every engineering team to deliver fast, efficient, and reliable experiences. Our mission is to make performance a shared responsibility across the company through data, automation, and collaboration.
As a

Staff Engineer

on the Performance Engineering team, you’ll take technical ownership of complex performance challenges across the W&B platform and infrastructure. You’ll design and lead experiments to improve system scalability and latency, develop standardized benchmarking and load testing frameworks, and drive initiatives to prevent regressions across product surfaces. Day to day, you’ll blend investigation, architecture, and enablement—helping teams measure, understand, and continuously improve performance.
8+ years of experience as a software engineer, with at least 2 years focused on performance optimization, systems scalability, or observability.
~ Proficiency in at least one of Go, Python, or TypeScript, with strong systems-level debugging and profiling skills.
~ and their performance implications.
~ Experience designing and implementing load testing, benchmarking, or performance regression frameworks (e.g., and performance data analysis.
~ Experience integrating performance measurement into CI/CD pipelines.
~ Ability to design experiments, analyze large datasets, and draw actionable conclusions.
~ Prior experience in performance engineering or SRE at scale (e.g., Familiarity with frontend performance monitoring and web vitals.
Experience building developer-facing tools or frameworks.
Background in data systems, observability, or ML infrastructure.
Experience contributing to open-source performance or benchmarking tools.
Here are a few qualities we’ve found compatible with our team. You love to turn messy, complex performance problems into clear, data-backed stories that lead to concrete action.
You’re curious about how systems behave under real-world load and enjoy building experiments that reveal what’s really happening under the hood.
You find satisfaction in long-term, cross-team collaboration — helping others succeed by embedding performance thinking into their workflows.
You get energy from bridging theory and practice: designing scalable architectures

and

writing the code that proves them out.
As we get set for takeoff, the growth opportunities within the organization are constantly expanding. 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).
These include qualifications, experience, interview performance, and location.
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)
~ Flexible, full-service childcare support with Kinside
~Flexible PTO
~ Catered lunch each day in our office and data center locations
~ A casual work environment
~ 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. This position requires access to export controlled information. S. citizen or national, (ii) U.S. lawful permanent resident (green card holder), (iii) refugee under 8 U.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.