Research Engineer, Signal & Ranking for Next-Gen Web Search

Wwshemi; Zürich; Hybrid; CHF 120,000 - 180,000; Full time

Job summary

Exa, an applied AI lab, is seeking a research engineer to own the signals behind ranking decisions and the decisions themselves for massive-scale search systems. You will contribute to end-to-end improvements across crawling, indexing and retrieval, with a focus on high-quality knowledge and reliable signals at web scale.

You will work across teams to define success where ground truth is scarce, building and evaluating ML models that improve search quality and user experience for billions of

Qualifications

• Proven hands-on ML experience with classifiers, rankers and calibration.
• Ability to define success without ground truth.
• Strong data instincts at web scale.
• Experience working across crawling, indexing and retrieval teams.

Responsibilities

• Own the signals behind ranking decisions and the decisions themselves.
• Work across teams to improve end-to-end search quality.
• Prototype and evaluate ML models for page quality, credibility, and information relevance.
• Collaborate with infrastructure teams to deploy scalable ML systems.

Skills

End-to-end impact

ML experience

Web-scale data instincts

Cross-team collaboration

Tools

Classifiers

Rankers

Calibration

Job description

Exa, an applied AI lab, is seeking a research engineer to own the signals behind ranking decisions and the decisions themselves for massive-scale search systems. You will contribute to end-to-end improvements across crawling, indexing and retrieval, with a focus on high-quality knowledge and reliable signals at web scale.

You will work across teams to define success where ground truth is scarce, building and evaluating ML models that improve search quality and user experience for billions of