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Grok Global Services

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$119K - $143K/yr

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Software Engineer - Training/Inference (C++)

SpaceXAI

Palo Alto, CA • On-site

$180K - $440K/yr

Full-time

Medical, Dental, Vision, Life, Retirement

Re-posted 18 days ago

SpaceX rating

8.8

Company rating: 8.8 out of 10

Based on 147 frontline employees who took The Breakroom Quiz

15th of 72 rated aerospace companies

Job description

About the Role:
  • We are building the high-performance inference platform that serves Grok to millions of users every day with lightning speed and perfect reliability.
  • 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).
  • This is a high-impact role where your work directly determines how fast and reliably users interact with Grok at massive scale

Responsibilities: 

  • 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.
  • Benchmark, fine-tune, and accelerate inference engines (including low-level GPU kernel work and code generation).
  • 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.
BASIC QUALIFICATIONS:
  • Deep low-level systems programming (C/C++ or Rust)
  • Experience with large-scale, high-concurrent production serving.
  • Experience with GPU inference engines (vLLM, SGLang, Triton, TensorRT-LLM, etc.).
  • Strong background in system optimizations: batching, caching, load balancing, parallelism.
  • Low-level inference optimizations: GPU kernels, code generation.
  • Algorithmic inference optimizations: quantization, speculative decoding, distillation, low-precision numerics.
  • Experience with testing, benchmarking, and reliability of inference services.
  • Experience designing and implementing CI/CD infrastructure for inference.
COMPENSATION AND BENEFITS:

$180,000 - $440,000 USD

Base salary is just one part of our total rewards package at SpaceXAI, which also includes equity, comprehensive medical, vision, and dental coverage, access to a 401(k) retirement plan, short & long-term disability insurance, life insurance, and various other discounts and perks.

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Pay

Benefits

Hours and flexibility

Workplace

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About SpaceX

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Industry

Aerospace product and parts manufacturing, data services, guided missile and space vehicle manufacturing and satellite telecommunications

Company size

1,001 - 5,000 Employees

Headquarters location

Hawthorne, CA, US

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