Senior Engineer, Core API - W&B
About The Position
The Core Systems team is responsible for the foundational backend infrastructure that powers Weights & Biases within CoreWeave. Much of the platform’s 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. You’ll 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.
Requirements
- 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.
Nice To Haves
- 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.
Responsibilities
- building and evolving the core backend systems and shared infrastructure that power our platform
- own and improve internal schema and code generation tooling that ensures consistency and correctness across services
- work on and extend our custom job scheduler, improving reliability, observability, and execution guarantees for distributed workloads
- contribute to safely execute large-scale concurrent and distributed operations
- defining and maintaining API standards across teams, ensuring performance, backward compatibility, and clear evolution strategies
- collaborate closely with Product and various Engineering teams to design systems that are reliable, scalable, and maintainable over time
Benefits
- 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
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What This Job Offers
Job Type
Full-time
Career Level
Mid Level
Education Level
No Education Listed
