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About the Role

As a Senior Data Scientist on our Search & Algorithms team, you'll own NLP analytics for our next-generation semantic search experiences. You'll apply NLP and LLM-based techniques to a proprietary corpus of millions of real consumer search interactions to improve how our models rank and personalize results. You'll also prototype data products that turn those signals into features product and engineering can ship. This is an AI-native role where LLM evaluation tooling and AI-assisted workflows are core to how you'll work.

Responsibilities

Measure and evaluate semantic search models using NLP and LLM-based evaluation frameworks on real user queries.
Prototype data products that leverage conversational query data and behavioral signals to drive personalized search experiences.
Design tests for search model changes, define primary and guardrail metrics, and communicate results clearly to stakeholders.
Instrument and analyze conversational AI data using LLM observability and evaluation tooling.
Partner with search product and engineering leadership to define success metrics and shape the analytics roadmap for search.
Work in an AI-native way by applying agentic AI workflows, LLM APIs, and AI-assisted development.
Actively evaluate and adopt new tooling as the space evolves.

Requirements

5+ years in data science, with 2+ years focused on NLP, text analytics, or search analytics.
Hands-on NLP experience including query classification, intent detection, semantic similarity, entity extraction, or LLM-based evaluation.
Strong Python skills and proficiency with NLP libraries (Hugging Face, spaCy, scikit-learn, or similar).
Experience analyzing conversational and LLM-generated data using observability or evaluation tooling (e.g., Langfuse, Braintrust, or similar).
Robust SQL skills and comfort working with large-scale clickstream or query log datasets.
Solid experimentation fundamentals including A/B testing, power analysis, and statistical inference.
Ability to build rapid prototypes and translate analytical findings into product-ready recommendations.
Excellent communication skills, able to present NLP and AI concepts clearly to product and executive stakeholders.
Experience with search ranking analytics, query log analysis, or information retrieval measurement.
Hands-on experience with LLM APIs (OpenAI, Claude, Gemini, or similar) and prompt engineering for evaluation, scoring, or analytical tasks.
Experience working with LLM observability platforms (Langfuse, Braintrust, or similar) to instrument, trace, and evaluate AI product performance at scale.
Prior work in consumer-facing search products or two-sided marketplace analytics.
Experience with Snowflake or similar cloud data warehouses.

Skills

NLP
LLM-based techniques
Semantic search
Python
Hugging Face
spaCy
scikit-learn
SQL
A/B testing
Power analysis
Statistical inference
Prompt engineering
LLM observability
Information retrieval measurement

Location

Onsite (office locations mentioned)

Work Type

Hybrid (three or more days in office)

Experience Level

Senior
5+ years in data science
2+ years focused on NLP, text analytics, or search analytics

Education Level

Bachelor's or Master's degree in Computer Science, Statistics, Linguistics, Information Science, or a related field.
Ph.D. in Computer Science, Computational Linguistics, NLP, or a related field (preferred)

Benefits

Inclusive and Competitive medical, Rx, dental, and vision coverage
Family forming benefits
13 Paid Holidays
Flexible Time Off
8 hours of paid Volunteer Time off
Immediate eligibility into Company 401(k) plan with 3.5% company match
Tuition Reimbursement program for degreed and non-degreed programs
1:1 personalized Financial Planning Sessions
Student Debt Retirement Savings Match program
Free snacks and refreshments in each office location

About the Company

Realtor.com® is the No. 1 site trusted by real estate professionals, at the forefront of online real estate for over 25 years.
The company connects buyers, sellers, and renters with trusted insights and expert guidance to find their perfect home.
Realtor.com® makes a significant impact on the real estate industry and provides consumers with an easy-to-use, easy-to-understand, and decision-making-friendly user experience.
The company's mission is to empower more people to find their way home by breaking barriers to entry, making the right connections, and building confidence through expert guidance.
The company balances creativity and innovation on a foundation of in-person collaboration.
Realtor.com® is committed to investing in the health and wellbeing of its employees and their families.

Equal Opportunity

Realtor.com® is an Equal Opportunity Employer regardless of age, color, national origin, race, religion, creed, gender, sex, sexual orientation, gender identity and/or expression, marital status, status as a disabled veteran and/or veteran of the Vietnam Era or any other characteristic protected by federal, state or local law.
Realtor.com® will provide reasonable accommodations for otherwise qualified disabled individuals.