# Sr. Software Engineer, Training/Inference (C++) at xAI

- Company: xAI
- What the company does: SpaceXAI builds Grok — frontier AI models for reasoning, voice, image generation, and more. Build with the Grok API. Backed by Lightspeed, Sequoia and a16z.
- Company website: https://x.ai/
- Type: Startups (AI role)
- Level: Senior
- Location: Palo Alto, CA
- Work setup: On-site
- Pay: $220K to $357K base salary per year (USD)
- Posted: 2026-11-05
- Apply by: 2026-12-20
- Apply: https://job-boards.greenhouse.io/xai/jobs/5286879007?utm_source=1752vc&utm_medium=careers
- Page: https://www.1752.vc/careers/jobs/xai-sr-software-engineer-training-inference-c/

## About the role

At SpaceXSI we are building the high-performance inference platform that serves Grok to millions of users every day. As a Software Engineer, Training/Inference (C++), 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, including GPU kernels, quantization, speculative decoding, and tail latency. Found on 1752vc Careers, the job board for startup and VC roles.

## What they're looking for

- Bachelor’s degree in computer science, computer engineering, or science discipline
- 5+ years of experience with low-level system programming experience in C/C++ or Rust

Tags: Infrastructure

Source: 1752vc Careers, https://www.1752.vc/careers/jobs/xai-sr-software-engineer-training-inference-c/