Research Engineer, Index Intelligence
- Location
- San Francisco, CA · On-site
- Job type
- Full-time
- Level
- Senior
- Listed
- 30 days ago
Skills & highlights for this role
- machine learning classifiers
- learned ranking models
- model calibration
- web-scale data pipelines
Also useful
- embedding models
- vector databases
- web crawling
Desired Experience
- You are comfortable owning a problem with no ground truth, where the first job is defining what the right answer means
- Hands-on ML experience with classifiers, rankers and calibration, plus strong data instincts at web scale
- You think in end-to-end impact. A signal only counts if a decision changes and search gets better
- You like working across teams. Crawling, indexing and retrieval all consume what you build
- You care about the problem of finding high quality knowledge and recognize how important this is for the world
Example Projects
- Make parsing work on the pages where it currently does not, and prove the improvement rather than assert it
- Teach a model to judge page quality, and get everyone to agree on what quality means well enough to supervise it
- Work on credibility and misinformation as a modelling problem: what a page claims, whether it is a reliable source of it, and whether it was written for a reader or for a crawler
- Decide whether two documents are semantically the same or genuinely different, so we can deduplicate the web without collapsing pages that a user would want to see separately
About Exa
Exa is an applied AI lab building a search engine unlike the world has ever seen. We build massive-scale infra to crawl the entire web, train state-of-the-art embedding models to process it, and design super high performant vector databases to retrieve over it. We now power search for Cursor, Cognition, HubSpot, and over 400,000 developers and have raised $350m from Lightspeed, Benchmark, and a16z.
Our ultimate goal is to build perfect search over all the world's information, far beyond Google. If you want to build massive-scale ML systems that will define the way the new AI world consumes information, this is the place for you.
We crawl the web continuously and cannot keep all of it, refresh all of it, or spend a GPU on all of it. Something has to decide which pages are worth indexing, which links are worth following, which pages say the same thing as pages we already have, what has gone stale, and what we should never have picked up. These decisions are worth more than most ranking work. The cheapest way to improve search is to stop indexing pages nobody should ever retrieve, and to start indexing the ones we are missing. Today they run on a mix of learned signals and thresholds someone picked.
We are looking for a research engineer to own the signals behind those decisions, and the decisions themselves.
Equal opportunity and legal notices
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.
From Exa's careers page, first listed on Rolev.ai on October 10, 2026. Rolev.ai is not the employer.
How Rolev.ai helps with this application
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Common questions
Where is the Research Engineer, Index Intelligence job at Exa located?
This Research Engineer, Index Intelligence position at Exa is located in San Francisco, CA (On-site). Always check Exa's application page for specific state eligibility or relocation policies.
What qualifications are required for Research Engineer, Index Intelligence at Exa?
For the Research Engineer, Index Intelligence role, Exa highlights experience with machine learning classifiers, learned ranking models, model calibration, web-scale data pipelines. Rolev.ai can score your existing resume against these requirements and show any skill gaps before you apply.
How do I apply for the Research Engineer, Index Intelligence position at Exa?
This listing links directly to Exa's Ashby application page. You can apply directly on Exa's site, or use Rolev.ai to check your resume fit, generate a zero-hallucination tailored resume and cover letter for this posting, and autofill the Ashby application form in 1 click with the Rolev.ai Chrome extension. You always review the form and press Submit yourself.