Machine Learning Engineer, Ads at xAI

Palo Alto, CAEngineeringPosted 11 months ago

About the role

As published on xAI's job board, updated Oct 27, 2026.

SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today, SpaceX is actively developing the technologies to make this possible, with the ultimate goal of making life multiplanetary and expanding consciousness to the stars.

SpaceXSI is building Super Intelligence to help humanity understand the universe. Our teams are building the full Super Intelligence stack: from our Colossus supercomputers, to Grok models, to our suite of applications, including Grok Bot, Grok Build, Grok Imagine, Grok Voice, and X. We're creating a powerful flywheel where more compute trains better models, better models power more useful products, and what we learn from people using those products shapes what we build next.

MACHINE LEARNING ENGINEER, ADS

We’re looking for exceptional engineers who want to join us on a new project to integrate Grok into all parts of our Ads Platform. We’re looking for individuals who have built exceptional advertising products and systems at a massive scale across bidding, auction, marketplace, ranking, prediction, and product. We’re bringing SpaceXSI's technology stack to Ads Platform and using it to transform our advertising stack.

RESPONSIBILITIES:

  • Leverage the latest Grok models to power all stages of our advertising stack, from candidate selection to ranking, auction, campaign optimization, creative generation, and advertiser experience
  • Own and operate systems and products, driving the majority of revenue

BASIC QUALIFICATIONS:

  • 3+ years of industry experience working on large-scale, high-throughput AI-powered advertising products

COMPENSATION AND BENEFITS:

$180,000 - $440,000 USD

Base salary is just one part of our total rewards package at SpaceXSI, 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.

SpaceXSI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.

Before you apply

  1. Scan your resume against this posting to see which of its terms you are missing.
  2. Tailor your resume so the summary and bullets use the posting's own wording where it is true for you.
  3. Read the machine learning engineer resume guide and the interview questions for the role.
  4. Apply on xAI's site. Applications never pass through OneTwo Resume.

About xAI

AI company (now operating as SpaceXSI) that builds the Grok models, the Colossus compute clusters and Grok apps and API.

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