AI Inference Engineer; Member of Technical Staff

• We are looking for an AI Inference Engineer to join our growing team. We build and run the inference engine behind every Perplexity query and deploy dozens of model architectures at scale with tight latency and cost budgets. Our stack is Rust, Python, CUDA, and CuTe DSL
• New models support. Support transformer-based retrieval, text-generation, and multimodal models in our inference infrastructure, from weight loading, request scheduling and KV-cache management to support in API Gateway
• GPU kernels migration to CuTe DSL. Port our in-house CUDA kernels to NVIDIA’s CuTe DSL so they run on GB200 today and are portable to Vera Rubin racks tomorrow
• Rust-native serving runtime. Develop our internal Rust-based inference server to solve all Python pains and keep up with rapidly growing traffic
• Performance optimisation. Profile and fix bottlenecks from network ingress through continuous batching and GPU kernels interleaving
• Reliability and observability. Build dashboards, alerts, and automated remediation so we catch regressions before users do. Respond to and learn from production incidents

You understand modern LLM architectures and are able to bring them up reliably in a production environment

Deep experience with GPU programming and performance work (CUDA, Triton, CUTLASS, or similar). Any other deep systems programming experience is a plus

You’ve built and operated production distributed systems under real load - ideally performance-critical ones

You own problems end-to-end. You can read a research paper on Monday, write a kernel on Wednesday, and debug a production incident on Friday Comfortable working across languages and layers:
Rust for the serving runtime, Python for model code, CUDA/CuteDSL for kernels

Self-directed. You do well in fast-moving environments where the path forward isn’t laid out for you Understanding of GPU architectures (memory hierarchy, warp scheduling, tensor cores)
Understanding of common LLM architectures and inference optimization techniques (e.g. quantization, speculative decoding, prefill-decode disaggregation)3+ years of professional software engineering experience with meaningful work on ML inference or high-performance systems

Familiarity with at least one deep learning framework (PyTorch, JAX, Tensor Flow)
Low-precision inference: INT8/FP8/FP4 quantization, mixed-precision servingML compilers and framework internals:
PyTorch internals, torch.compile, custom operators

Profiling and debugging tools:
Nsight Compute/Systems, CUDA-GDB, PTX/SASS analysis

Container orchestration:
Kubernetes, GPU scheduling, autoscaling inference workloads

Distributed GPU communication: NCCL, NVLink, Infini Band, RDMA libraries, model/tensor parallelism