Member of Technical Staff, Fireworks AI

• 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
• Proficiency in CUDA or ROCm and experience with GPU profiling tools (e.g., Nsight, nvprof, CUPTI)
• Familiarity with PyTorch and performance-critical model execution
• Experience with distributed system debugging and optimization in multi-GPU environments
• Deep understanding of GPU architecture, parallel programming models, and compute kernels
• Experience optimizing large models for training and inference (LLMs, VLMs, or video models)

Desirable

• 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