Member of Technical Staff (AI Inference Engineer)

Fdetimes; San Francisco (CA); On-site; USD 140,000 - 240,000; Full time

Job summary

Fdetimes is seeking an experienced software engineer to join the inference team building the backbone of Perplexity query processing. You will work across Rust, Python, CUDA, and CuTe DSL to deploy scalable, low-latency models and explore new architectures.

You will contribute to model support, kernel migrations, and a robust serving runtime while improving performance, reliability, and observability in production workloads.

Qualifications

• 3+ years of professional software engineering experience with ML inference or high-performance systems.
• Familiarity with at least one deep learning framework (PyTorch, JAX, TensorFlow).
• 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).

Responsibilities

• Work on new model support for transformer-based retrieval, text-generation, and multimodal models in inference infrastructure.
• Migrate GPU kernels to CuTe DSL for portability and performance.
• Develop Rust-based serving runtime to reduce Python-related bottlenecks and support increasing traffic.
• Profile and fix bottlenecks across network ingress, batching, and GPU kernel interleaving.
• Build dashboards, alerts, and automated remediation to catch regressions and triage production incidents.

Skills

GPU programming

LLM architectures

Distributed systems

Rust

Python

Tools

CUDA

CuTe DSL

Kubernetes

Job description

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 - and we need another engineer to join us.

What you will work on

Examples of real work the team does

• 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 kernel interleaving.
• Reliability and observability. Build dashboards, alerts, and automated remediation so we catch regressions before users do. Respond to and learn from production incidents.

Who we're looking for

• Deep experience with GPU programming and performance work (CUDA, Triton, CUTLASS, or similar). Any other deep systems programming experience is a plus.
• You understand modern LLM architectures and are able to bring them up reliably in a production environment.
• You've built and operated production distributed systems under real load - ideally performance-critical ones.
• Comfortable working across languages and layers: Rust for the serving runtime, Python for model code, CUDA/CuteDSL for kernels.
• 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.
• Self-directed. You do well in fast-moving environments where the path forward isn't laid out for you.

Good if you touched any of

• ML compilers and framework internals: PyTorch internals, torch.compile, custom operators.
• Distributed GPU communication: NCCL, NVLink, InfiniBand, RDMA libraries, model/tensor parallelism.
• Low-precision inference: INT8/FP8/FP4 quantization, mixed-precision serving.
• Profiling and debugging tools: Nsight Compute/Systems, CUDA-GDB, PTX/SASS analysis.
• Container orchestration: Kubernetes, GPU scheduling, autoscaling inference workloads.

Qualifications

• 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, TensorFlow).
• 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).