Senior Voice AI Model Engineer — Real‑Time, Scalable

X AI; Palo Alto (CA); On-site; USD 220,000 - 357,000; Full time

Benefits offered by this job

Equity

Medical, vision, and dental coverage

401(k) retirement plan

Disability insurance

Life insurance

Job summary

SpaceXSI is seeking a senior model engineer for voice to design, build, and run the software systems behind Grok Voice, delivering multilingual, low-latency spoken interactions across devices in real time.

You will own data pipelines, distributed training infrastructure, and deployment from prototype to global scale, with emphasis on stability and performance. Strong Python, PyTorch, and JAX skills, plus Kubernetes and distributed data tools, are valued.

Qualifications

• Bachelor's degree in computer science, software engineering, computer engineering, electrical engineering, or another engineering discipline.
• Experience writing production-quality code in Python, PyTorch, JAX, Rust, or C++.
• 2+ years of experience working with large scale voice related products.

Responsibilities

• Design, build, and maintain large-scale distributed data pipelines that ingest, process, and annotate real-world and synthetic audio, so the training and evaluation systems get reliable, high-quality data
• Build and optimize the distributed training infrastructure and software for speech-language models in JAX and PyTorch, including the systems that run supervised fine-tuning and reinforcement learning at scale
• Build automated evaluation and testing systems that measure accuracy, audio quality, latency, and real-time performance, plus the experimentation infrastructure used to validate every model release
• Integrate voice models into production applications and real-time services, write the technical specifications for spoken interactions, and own deployment from prototype to global scale with a focus on stability, low latency, and reliability
• Profile and optimize system performance across training and inference, including throughput, latency, memory use, and compute efficiency

Skills

Python

PyTorch

JAX

Rust

C++

Distributed systems

Kubernetes

Education

Bachelor's degree in computer science, software engineering, computer engineering, electrical engineering, or another engineering discipline

Tools

Spark

Ray

Job description

SpaceXSI is seeking a senior model engineer for voice to design, build, and run the software systems behind Grok Voice, delivering multilingual, low-latency spoken interactions across devices in real time.

You will own data pipelines, distributed training infrastructure, and deployment from prototype to global scale, with emphasis on stability and performance. Strong Python, PyTorch, and JAX skills, plus Kubernetes and distributed data tools, are valued.