Research Engineer (AI)

Location: San Francisco, California; on-site

Salary: $180K–$350K

Company

hirify.global is an applied AI lab building a large-scale search engine that crawls the web, trains embedding models, and uses high-performance vector databases for retrieval.

What you will do

• Own the signals and decisions that determine which pages to index, refresh, follow, deduplicate, or exclude.
• Improve parsing on pages that are currently unsupported and measure the resulting search improvements.
• Train models to assess page quality and establish workable definitions of quality for supervision.
• Model credibility, misinformation, source reliability, and whether content is intended for readers or crawlers.
• Determine whether documents are semantically equivalent or meaningfully different for web deduplication.
• Collaborate with crawling, indexing, and retrieval teams to ensure signals produce measurable search improvements.

Requirements

• Hands-on machine learning experience with classifiers, rankers, and calibration.
• Strong data intuition and experience working at web scale.
• Ability to own ambiguous problems without established ground truth and define what the correct answer means.
• End-to-end product and systems thinking, connecting signals to decisions and search quality.
• Interest in finding and evaluating high-quality knowledge.

Culture & Benefits

• Cross-functional work spanning crawling, indexing, retrieval, and machine learning.
• Opportunity to build infrastructure and ML systems operating at massive web scale.
• Equal opportunity employment practices.