← All roles

Research Engineer, Index Intelligence

Exa· Research
Apply on company site
San Francisco, California$180k - $350kFull-timePosted 2w ago

About the role

Research Engineer responsible for owning the signals and decisions behind crawl/indexing quality, with end-to-end impact on search quality at a large-scale AI-driven web indexing platform.

Responsibilities

  • Own the signals behind indexing and retrieval decisions that affect what pages are indexed, followed, and kept or discarded.
  • Develop and deploy classifiers, rankers, and calibration models at web scale.
  • Collaborate across crawling, indexing, and retrieval teams to improve end-to-end search quality.
  • Define what constitutes the right answer in situations without ground truth and measure impact on search performance.
  • Work on projects related to page quality, credibility/misinformation, and deduplication without harming user-visible results.

Qualifications

  • Hands-on ML experience with classifiers, rankers and calibration
  • Strong data instincts at web scale
  • Ability to define success in the absence of ground truth and measure end-to-end impact
  • Comfort working across teams (crawling, indexing, retrieval)

Skills

Required:Machine Learning for ranking and calibrationEnd-to-end impact assessment

Benefits

  • Exa is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, creed, color, religion, sex, sexual orientation, gender identity or expression, national origin, disability, age, veteran status, marital status, pregnancy or related conditions, criminal histories consistent with applicable law, or any other basis protected by applicable law.
Last updated Oct 7, 2026. Interested? Apply on the company site.
Exa logo

About Exa

Web search rebuilt for LLMs

Exa is a search engine built for AIs. We enable developers to filter the internet's content with complex queries in order to bring the world's knowledge into their AI apps.

ai-infrastructure-and-developmentapisartificial-intelligencebrex-fastest-growing-2025searchwing-list-2026wing-list-2026-mid-stage
Company profileWebsite

More open roles at Exa