Senior Model Evaluation Engineer

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 engineers are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates.

• Python
• JAX and XLA
• Rust / C++
• Spark

• Provide complete assessment of models.
• Deep dive into model training and data to identify the weakness point revealed in evaluation.
• Communicate with modeling and data team to come up with plans to improve model quality.

• Model assessment and evaluation task development  (including public and in-house benchmarking).
• Collect data and synthesize data for new evals.

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• Build infrastructure and framework for easy-to-use model evaluation, familiarity with inference frameworks like SGlang and vLLM.

The role is based in the Bay Area [San Francisco and Palo Alto]. Candidates are expected to be located near the Bay Area or open to relocation.

$180,000 - $440,000 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.

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