LLM Inference Frameworks and Optimization Engineer

Together AI is a research-driven artificial intelligence company focused on optimizing AI systems. They are seeking an Inference Frameworks and Optimization Engineer to design and optimize distributed inference engines for large language models, ensuring high performance and scalability.

Responsibilities:

• Design and develop fault-tolerant, high-concurrency distributed inference engine for text, image, and multimodal generation models
• Implement and optimize distributed inference strategies, including Mixture of Experts (MoE) parallelism, tensor parallelism, pipeline parallelism for high-performance serving
• Apply CUDA graph optimizations, TensorRT/TRT-LLM graph optimizations, and PyTorch-based compilation (torch.compile), and speculative decoding to enhance efficiency and scalability
• Collaborate with hardware teams on performance bottleneck analysis, co-optimize inference performance for GPUs, TPUs, or custom accelerators
• Work closely with AI researchers and infrastructure engineers to develop efficient model execution plans and optimize E2E model serving pipelines

Requirements:

• 3+ years of experience in deep learning inference frameworks, distributed systems, or high-performance computing
• Familiar with at least one LLM inference frameworks (e.g., TensorRT-LLM, vLLM, SGLang, TGI(Text Generation Inference))
• Background knowledge and experience in at least one of the following: GPU programming (CUDA/Triton/TensorRT), compiler, model quantization, and GPU cluster scheduling
• Deep understanding of KV cache systems like Mooncake, PagedAttention, or custom in-house variants
• Proficient in Python and C++/CUDA for high-performance deep learning inference
• Deep understanding of Transformer architectures and LLM/VLM/Diffusion model optimization
• Knowledge of inference optimization, such as workload scheduling, CUDA graph, compiled, efficient kernels
• Strong analytical problem-solving skills with a performance-driven mindset
• Excellent collaboration and communication skills across teams
• Experience in developing software systems for large-scale data center networks with RDMA/RoCE
• Familiar with distributed filesystem(e.g., 3FS, HDFS, Ceph)
• Familiar with open source distributed scheduling/orchestration frameworks, such as Kubernetes (K8S)
• Contributions to open-source deep learning inference projects