Machine Learning Engineer — Reinforcement Learning

Institute of Foundation Models
Sunnyvale, CA
On-site

Who this role is best for

Geared toward seasoned ML systems engineers comfortable with distributed training and RL pipeline development, working in a collaborative research environment in Sunnyvale, CA.

Best fit for

  • Candidates with 5+ years of experience in distributed ML frameworks and infrastructure development
    — “5+ years of experience in ML systems, infra, or distributed training”
  • Individuals with a background in building and debugging large-scale training systems
    — “Proven multi-node experience (e.g., Slurm, Kubernetes, Ray) and debugging skills (e.g., NCCL/GLOO)”

Things to consider

  • Candidates must be prepared to work on complex, high-performance computing systems at scale.
    — “ensure reliability and maintainability at scale”

How to stand out

  • Highlight experience with policy optimization methods like PPO or GRPO in your resume and interview prep.
    — “Working knowledge of policy optimization methods such as PPO or GRPO”
  • Showcase your ability to debug multi-node systems, especially with NCCL/GLOO.
    — “debugging skills (e.g., NCCL/GLOO)”
  • Emphasize your ownership of end-to-end RL pipelines in your application materials.
    — “Hands-on experience developing an LLM RL pipeline, with ownership across rollout/inference and distributed training integration.”
  • Demonstrate your experience with large-scale machine learning workloads and distributed training.
    — “Experience with large-scale machine learning workloads (strong ML fundamentals)”
  • Include projects or contributions related to training frameworks like DeepSpeed or FSDP.
    — “Experience modifying distributed ML frameworks (e.g., DeepSpeed, FSDP, FairScale, Horovod)”
Pace · Fast PacedCollaboration · HighAutonomy · MediumDecision Impact · Team

Derived from job-description analysis by Serendipath's career intelligence engine.

What success looks like

  • Extend or modify training frameworks
  • Connect training workers with rollout generation engines
  • Create and debug multi-node launch scripts
  • Build systems for experiment tracking and job monitoring
Typical background
Experience in ML systems and infrastructureExperience in distributed training

Skills & requirements

Required

Distributed ML FrameworksTraining & Inference IntegrationMetrics & MonitoringInfrastructure EngineeringReinforcement Learning Pipeline Development

Preferred

Mixed-precision TrainingPerformance ProfilingCUDA Or Triton Kernel ExperienceLarge-scale Pre-training

Stack & domain

Machine LearningReinforcement LearningDistributed FrameworksTrainingInferenceMetricsMonitoringInfra EngineeringRL Pipeline DevelopmentRL ExecutionRecoveryPolicy OptimizationPPOGRPOMixed-precision TrainingPerformance ProfilingKernel FusionMemory OptimizationCUDATriton KernelLarge-scale Pre-trainingCustom Training PipelinesTraining InfrastructurePerformance TuningProblem SolvingCollaborationCommunicationTeamworkAttention To DetailInnovationExecutionLeadershipStrategic ThinkingDistributed TrainingTraining FrameworksRL Pipeline

About the role

Original posting from Institute of Foundation Models via Lever

About the Institute of Foundation Models

We are a dedicated research lab for building, understanding, using, and risk-managing foundation models. Our mandate is to advance research, nurture the next generation of AI builders, and drive transformative contributions to a knowledge-driven economy.

As part of our team, you’ll have the opportunity to work on the core of cutting-edge foundation model training, alongside world-class researchers, data scientists, and engineers, tackling the most fundamental and impactful challenges in AI development. You will participate in the development of groundbreaking AI solutions that have the potential to reshape entire industries. Strategic and innovative problem-solving skills will be instrumental in establishing MBZUAI as a global hub for high-performance computing in deep learning, driving impactful discoveries that inspire the next generation of AI pioneers.

Key Responsibilities:

  • Distributed Framework Ownership – Extend or modify training frameworks (e.g., DeepSpeed, FSDP) to support new use cases and architectures.
  • Training & Inference Integration – Connect training workers with rollout generation engines (e.g., vLLM, SGLang), including trajectory exchange and policy-weight synchronization.
  • Launch Config & Debugging – Create and debug multi-node launch scripts with flexible batch sizes, parallelism strategies, and hardware targets.
  • Metrics & Monitoring – Build systems for experiment tracking, job monitoring, and logging usable by collaborators and researchers.
  • Infra Engineering – Write production-quality code and tests for ML infra in PyTorch or JAX; ensure reliability and maintainability at scale.
  • RL Pipeline Development – Implement reward/verifier integration and trajectory processing, and validate log probabilities, token masks, and loss inputs with researchers.
  • RL Execution & Recovery – Coordinate rollout and training workers, including checkpoint/restart and failure recovery; track policy versions and sample staleness when using asynchronous execution.

Qualifications:

Must-Haves:

  • 5+ years of experience in ML systems, infra, or distributed training
  • Experience modifying distributed ML frameworks (e.g., DeepSpeed, FSDP, FairScale, Horovod)
  • Strong software engineering fundamentals (Python, systems design, testing)
  • Proven multi-node experience (e.g., Slurm, Kubernetes, Ray) and debugging skills (e.g., NCCL/GLOO)
  • Ability to implement algorithms across GPUs/nodes based on mathematical specs
  • Experience working on an ML platform/ infrastructure, and/or distributed inference optimization team
  • Experience with large-scale machine learning workloads (strong ML fundamentals)
  • Hands-on experience developing an LLM RL pipeline, with ownership across rollout/inference and distributed training integration.
  • Working knowledge of policy optimization methods such as PPO or GRPO, sufficient to implement and debug sampling, log probabilities, and policy updates.

Nice-to-Haves:

  • Exposure to mixed-precision training (e.g., bf16, fp8) with accuracy validation
  • Familiarity with performance profiling, kernel fusion, or memory optimization
  • Open-source contributions or published research (MLSys, ICML, NeurIPS)
  • CUDA or Triton kernel experience
  • Experience with large-scale pre-training
  • Experience building custom training pipelines at scale and modifying them for custom needs
  • Deep familiarity with training infrastructure and performance tuning
  • Experience with asynchronous RL, multi-turn or tool-using rollout environments, or custom reward/verifier systems.

Compensation:

Salary Range

The posted salary range represents the company’s good faith estimate of the compensation for this position upon hire. The actual compensation offered may vary within this range depending on individual qualifications, including but not limited to relevant skills, experience, education, certifications, geographic location, and specific business needs.  

The posted salary range represents the company’s good faith estimate of the compensation for this position upon hire. The actual compensation offered may vary within this range depending on individual qualifications, including but not limited to relevant skills, experience, education, certifications, geographic location, and specific business needs.  

Benefits Include

*Comprehensive medical, dental, and vision benefits 

 *Bonus

*401K Plan

*Generous paid time off, sick leave and holidays

*Paid Parental Leave

*Employee Assistance Program

*Life insurance and disability

Source: Institute of Foundation Models careers (Lever)

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