Senior Engineer, Core API W&B

What Youll Do:

You will be responsible for building and evolving the core backend systems and shared infrastructure that power our platform. A significant portion of backend logic is shared across services and this role will help define maintain and scale that foundation.

You will own and improve internal schema and code generation tooling that ensures consistency and correctness across services. You will work on and extend our custom job scheduler improving reliability observability and execution guarantees for distributed workloads. You will contribute to safely execute large-scale concurrent and distributed operations.

You will play a key role in defining and maintaining API standards across teams ensuring performance backward compatibility and clear evolution strategies. You will collaborate closely with Product and various Engineering teams to design systems that are reliable scalable and maintainable over time.

About the role:

The Core Systems team is responsible for the foundational backend infrastructure that powers Weights & Biases within CoreWeave. Much of the platforms critical logic is shared across services and this role sits at the center of that foundation. You will work on the systems that other engineers build upon from execution frameworks and schedulers to schema tooling and API standards.

This is a high-leverage role focused on durability scalability and long-term maintainability. The systems you design and evolve will directly impact reliability developer velocity and the ability of the platform to scale with growing workloads. Youll collaborate across teams to ensure that shared backend abstractions remain clean performant and consistent as we continue to expand our adoption of technologies like GraphQL and gRPC.

If you enjoy owning deep technical infrastructure shaping engineering standards and building systems that other engineers depend on every day this role offers meaningful scope and impact.

Who You Are:

• 5 years of backend engineering experience building and operating production systems.
• Proven experience designing and maintaining distributed systems at scale.
• Hands-on experience designing and evolving APIs (REST GraphQL and/or gRPC).
• Strong proficiency in Go Python or a comparable backend systems language.
• Experience implementing concurrency and parallelism patterns in production systems.
• Demonstrated ownership of shared infrastructure internal platforms or developer tooling used by multiple teams.
• Experience diagnosing and optimizing system performance including CPU memory I/O and network bottlenecks.

Preferred:

• Familiarity with schema management code generation tools or interface definition systems (e.g. protobuf OpenAPI GraphQL schemas).
• Experience building or operating custom job schedulers workflow engines or execution frameworks.
• Experience defining cross-team API standards and governance models.
• Background in high-scale data or ML infrastructure systems.
• Experience improving reliability through observability metrics and SLO-driven development practices.

Why Us

We work hard have fun and move fast! Were in an exciting stage of hyper-growth that you will not want to miss out on. Were not afraid of a little chaos and were constantly learning. Our team cares deeply about how we build our product and how we work together which is represented through our core values:

• Be Curious at Your Core
• Act Like an Owner
• Empower Employees
• Deliver Best-in-Class Client Experiences
• Achieve More Together

We support and encourage an entrepreneurial outlook and independent thinking. We foster an environment that encourages collaboration and provides the opportunity to develop innovative solutions to complex problems. As we get set for takeoff the growth opportunities within the organization are constantly expanding. You will be surrounded by some of the best talent in the industry who will want to learn from you too. Come join us!

Wondering if youre 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 arent a 100% skill or experience match. Here are a few qualities weve found compatible with our team. If some of this describes you wed love to talk.

We believe in investing in our people and value candidates who bring diverse experiences to our teams even if you arent a 100% match on paper. If you love building foundational systems that other engineers rely on are curious about distributed execution and performance at scale and enjoy defining clean and durable abstractions wed love to talk.

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 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 weve 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: .

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.