Senior Software Engineer, Core API - Weights & Biases

About the role

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.

Responsibilities

• Build and evolve the core backend systems and shared infrastructure that power our platform.
• Define, maintain, and scale shared backend infrastructure.
• Own and improve internal schema and code generation tooling.
• Extend and improve our custom job scheduler.
• Contribute to safely executing large-scale concurrent and distributed operations.

• 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.

  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.

  Benefits

  CoreWeave offers a comprehensive benefits program including medical, dental, and vision insurance, company-paid life insurance, short and long-term disability insurance, a flexible spending account, a health savings account, tuition reimbursement, a mental wellness benefit, a family-forming support program, an employee stock purchase plan, paid parental leave, flexible PTO, catered lunch, a casual work environment, and a work culture focused on innovation and disruption.

  Pay

  The base salary range for this role is $165,000 to $242,000. The starting salary will be determined based on job-related knowledge, skills, experience, and market location.

  Schedule

  CoreWeave offers a flexible schedule to accommodate the needs of its employees.