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OpenAI Logo OpenAI · IT - Software Development

Software Engineer, Collective Communication

United States, San Francisco 380000.00 - 555000.00 USD / Year · Job Posted February 21, 2026
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Job Description

The Workload Networking team is responsible for the collective communication stack used in our largest training jobs. Using a combination of C++ and CUDA we work on novel collective communication techniques that enable efficient training of our flagship models on our largest custom built supercomputers. The models we train are key ingredients to the AI research progress at OpenAI and the field as a whole, and we continually incorporate learnings from our entire research org into our training platform.

Job Responsibility

  • Collaborate closely with ML researchers to design and implement efficient collective operations in C++ and CUDA
  • Ensure that our largest training jobs take full advantage of the different network transports used in our supercomputers
  • Work on simulations to inform our future supercomputer network designs

Requirements

  • Background in low level performance critical software
  • Experience with collective communication is a bonus
  • Have written distributed algorithms using RDMA in the past
  • Are comfortable writing low level performance sensitive CPU and/or GPU code
  • Are familiar with network simulation techniques

What we offer

  • Medical, dental, and vision insurance for you and your family, with employer contributions to Health Savings Accounts
  • Pre-tax accounts for Health FSA, Dependent Care FSA, and commuter expenses (parking and transit)
  • 401(k) retirement plan with employer match
  • Paid parental leave (up to 24 weeks for birth parents and 20 weeks for non-birthing parents), plus paid medical and caregiver leave (up to 8 weeks)
  • Paid time off: flexible PTO for exempt employees and up to 15 days annually for non-exempt employees
  • 13+ paid company holidays, and multiple paid coordinated company office closures throughout the year for focus and recharge, plus paid sick or safe time (1 hour per 30 hours worked, or more, as required by applicable state or local law)
  • Mental health and wellness support
  • Employer-paid basic life and disability coverage
  • Annual learning and development stipend to fuel your professional growth
  • Daily meals in our offices, and meal delivery credits as eligible
  • Relocation support for eligible employees
  • Additional taxable fringe benefits, such as charitable donation matching and wellness stipends, may also be provided
  • Offers Equity
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