xAI

Software Engineer - Training/Inference (C++)

Palo Alto, CA

Sponsorship not specified$180k-$440kDetected 2 days ago

RustC++Full-Stack DevelopmentCI/CDLLMsLoad BalancingResearchLeadershipCommunication

About the role

This is a high-impact role where your work directly determines how fast and reliably users interact with Grok at massive scale

Architect and implement scalable distributed infrastructure for model serving (load balancing, auto-scaling, batch scheduling, global KV cache).
Optimize latency and throughput of model inference under real production workloads.
Build reliable, high-concurrency serving systems that serve billions of users with 100% uptime, 0% error rate, and excellent tail latency.
Develop custom tools to trace, replay, and fix issues across the full stack - from orchestration down to GPU kernels.
Create robust CI/CD infrastructure for seamless endpoint deployment, image publishing, and inference engine updates.
Accelerate research on scaling test-time compute, RL rollout, and model-hardware co-design for next-generation systems.
As a Member of Technical Staff - Inference, you will design and optimize large-scale model serving systems end-to-end.
You will own everything from distributed infrastructure (global KV cache, continuous batching, load balancing, auto-scaling) to deep low-level optimizations (GPU kernels, quantization, speculative decoding, tail latency).
Inference, you will design and optimize large-scale model serving systems end-to-end.

Experience with large-scale, high-concurrent production serving.
Experience with GPU inference engines (vLLM, SGLang, Triton, TensorRT-LLM, etc.).
Experience with testing, benchmarking, and reliability of inference services.
Experience designing and implementing CI/CD infrastructure for inference.

This organization is for individuals who appreciate challenging themselves and thrive on curiosity.
All employees are expected to be hands-on and to contribute directly to the company's mission.
Work ethic and strong prioritization skills are important.
All employees are expected to have strong communication skills.
They should be able to concisely and accurately share knowledge with their teammates.

We are building the high-performance inference platform that serves Grok to millions of users every day with lightning speed and perfect reliability.

This listing is sourced directly from xAI's careers page and normalized into a canonical job model.