ML Inference Engineer

We're looking for an ML Inference Engineer with deep expertise in high-performance ML engineering. This is a highly technical, high-impact role focused on squeezing every drop of performance from generative media models.

You'll work across the inference stack, designing novel frameworks, optimizing inference performance, and shaping Reactor's competitive edge in ultra-low-latency, high-throughput environments.

What You'll Do

• Drive our frontier position on model performance for diffusion models

• Design and implement a high-performance in-house inference runtime

• Implement optimizations using torch.compile, custom CUDA kernels, and specialized inference frameworks

• Optimize neural network models through quantization, pruning, and architectural modifications

• Profile and benchmark model performance to identify computational bottlenecks

• Collaborate directly with model partner teams to integrate their models into our platform

Required Skills

• Bachelor's degree in Computer Science, Electrical Engineering, or a related technical field (or equivalent practical experience)

• Strong foundation in systems programming, with a track record of identifying and resolving bottlenecks

• Deep expertise in PyTorch, TensorRT, TransformerEngine, Nsight, ONNX Runtime

• Model compilation, quantization (INT8/FP16), and advanced serving architectures

• Working knowledge of GPU hardware (NVIDIA)

• Strong understanding of transformer architectures and modern ML optimization techniques

Benefits

• Competitive SF salary and meaningful early equity

• Visa sponsorship and relocation support

• Generous health, dental, and vision coverage

About Reactor

We're a team of industry veterans building the missing layer for world models. We've co-founded Luma AI, shipped the Apple Vision Pro, and scaled real-time video and inference infrastructure at Meta, Replicate, Microsoft, and Adobe. We're backed by Tier 1 investors and angels across AI, gaming, infrastructure, and robotics.