F
Fireworks AI
Member of Technical Staff (Performance Optimization)
Skills
NodePyTorchMachine LearningAIKubernetes
1 month ago
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Important information
Contract type:
Permanent
Salary:
$175,000 – $220,000 / year
Location:
San Mateo, CA, USA
Work mode:
Onsite
Published on:
12 September 2026
What they need
- We’re looking for a Software Engineer focused on Performance Optimization to help push the boundaries of speed and efficiency across our AI infrastructure
- In this role, you’ll take ownership of optimizing performance at every layer of the stack—from low-level GPU kernels to large-scale distributed systems
- A key focus will be maximizing the performance of our most demanding workloads, including large language models (LLMs), vision-language models (VLMs), and next-generation video models
- You’ll work closely with teams across research, infrastructure, and systems to identify performance bottlenecks, implement cutting-edge optimizations, and scale our AI systems to meet the demands of real-world production use cases
- Your work will directly impact the speed, scalability, and cost-effectiveness of some of the most advanced generative AI models in the world
- Optimize system and GPU performance for high-throughput AI workloads across training and inference
- Analyze and improve latency, throughput, memory usage, and compute efficiency
- Profile system performance to detect and resolve GPU- and kernel-level bottlenecks
- Implement low-level optimizations using CUDA, Triton, and other performance tooling
- Drive improvements in execution speed and resource utilization for large-scale model workloads (LLMs, VLMs, and video models)
- Collaborate with ML researchers to co-design and tune model architectures for hardware efficiency
- Improve support for mixed precision, quantization, and model graph optimization
- Build and maintain performance benchmarking and monitoring infrastructure
- Scale inference and training systems across multi-GPU, multi-node environments
- Evaluate and integrate optimizations for emerging hardware accelerators and specialized runtimes
- Example projects:
- Implement fully asynchronous low-latency sampling for large language models integrated with structured outputs
- Implement GPU kernels for the new low-precision scheme and run experiments to find optimal speed-quality tradeoff
- Build a distributed router with a custom load-balancing algorithm to optimize LLM cache efficiency
- Define metrics and build harness for finding optimal performance configuration (e.g. sharding, precision) for a given class of model
- Determine and implement in PyTorch an optimal sharding scheme for a novel attention variant
- Optimize communication patterns in RDMA networks (Infiniband, RoCE)
- Debug numerical instabilities for a given model for a small portion of requests when deployed at scale- Experience with distributed system debugging and optimization in multi-GPU environments
- Deep understanding of GPU architecture, parallel programming models, and compute kernels
- Proficiency in CUDA or ROCm and experience with GPU profiling tools (e.g., Nsight, nvprof, CUPTI)
- Familiarity with PyTorch and performance-critical model execution
- Bachelor’s degree in Computer Science, Computer Engineering, Electrical Engineering, or equivalent practical experience
- 5+ years of experience working on performance optimization or high-performance computing systems
- Experience optimizing large models for training and inference (LLMs, VLMs, or video models)
- Master’s or PhD in Computer Science, Electrical Engineering, or a related field
- Contributions to open-source ML or HPC infrastructure
- Knowledge of compiler stacks or ML compilers (e.g., torch.compile, Triton, XLA)
- Familiarity with cloud-scale AI infrastructure and orchestration tools (e.g., Kubernetes)
- Background in ML systems engineering or hardware-aware model design
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