Job Description
ABOUT XAI
xAI’s mission is to create AI systems that can accurately understand the
universe and aid humanity in its pursuit of knowledge. Our team is small, highly
motivated, and focused on engineering excellence. This organization is for
individuals who appreciate challenging themselves and thrive on curiosity. We
operate with a flat organizational structure. All employees are expected to be
hands-on and to contribute directly to the company’s mission. Leadership is
given to those who show initiative and consistently deliver excellence. 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.
ABOUT THE ROLE:
You will join the Grok Voice Model team to help build the world’s best voice AI.
We deliver smooth, natural, low-latency spoken interactions — expressive,
multilingual, and reliable across devices and real-time scenarios. We own the
full training pipeline: massive data curation, premium audio processing,
frontier speech-language pre-training, and intensive post-training to push
quality, speed, and stability to the limit.
Our goal: make talking to AI feel like conversing with the most charming, kind,
and knowledgeable person imaginable. We’re seeking exceptionally smart,
execution-oriented engineers to help us get there.
RESPONSIBILITIES:
* Design and execute large-scale speech data curation and processing pipelines,
including collection of diverse real-world audio, synthetic data generation,
and automated annotation workflows to enable high-quality model training and
evaluation.
* Work on pre-training and post-training of speech-language models, with
targeted enhancements through supervised fine-tuning, reinforcement learning,
and other techniques to ensure Grok Voice responses are accurate, factually
grounded, natural and idiomatic in spoken style, conversational in tone, and
fluent across multiple languages.
* Build and iterate a comprehensive evaluation framework covering objective
metrics (accuracy, quality, latency, expressiveness), human preference
studies, content factuality assessments, real-time interaction quality, and
experimentation infrastructure to measure and improve performance.
* Work closely with product teams to integrate voice models into applications
and real-time environments, define spoken interaction specifications, and
handle the full lifecycle from prototype to global-scale deployment for
stable, low-latency, delightful voice experiences.
BASIC QUALIFICATIONS:
* Python expert with deep proficiency in writing clean, efficient code for
AI/ML systems.
* Hands-on experience processing large-scale datasets using tools like Spark
and Ray for cleaning, augmentation, and feature extraction.
* Proficiency in pre-training and post-training speech-language models using
JAX/PyTorch, including supervised fine-tuning, reinforcement learning, and
optimizations for accuracy, factuality, natural spoken style, detail, and
multilingual fluency.
* Ability to set up and run rigorous evaluation pipelines: objective metrics,
human preference studies, content factuality checks, and iterative A/B
testing to drive model improvements.
* Experience building or working with large-scale distributed training and
inference systems on Kubernetes.
* Proactive, self-driven attitude — ready to grind in a fast-paced,
high-caliber team to deliver outstanding voice AI experiences.
COMPENSATION AND BENEFITS:
$150,000 - $450,000 USD
Base salary is just one part of our total rewards package at xAI, 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.
xAI is an equal opportunity employer. For details on data processing, view
our Recruitment Privacy Notice [
Job Tags
Full time, Temporary work