Senior Data Scientist

Responsibilities

• Own data science and AI evaluation projects end-to-end—from defining the problem and developing the methodology to executing the analysis, communicating results, and driving implementation.
• Build the data and evaluation infrastructure for a closed-loop AI quality system, including golden datasets, ground-truth benchmarks, judge calibration, error analysis, and production feedback.
• Continuously identify failure modes and translate insights into improvements to datasets, evaluation methodologies, LLM-as-a-Judge systems, and the underlying AI products.
• Design and implement robust evaluation frameworks, methodologies, and metrics for LLM- and speech-based AI systems. Develop scalable approaches that help us measure quality and accelerate customer onboarding.
• Build and manage evaluation datasets: Design, curate, and maintain high-quality datasets for training, testing, benchmarking, and evaluating conversational AI systems and their components.
• Create and manage data pipelines and dashboards: Build and maintain scalable data pipelines and intuitive dashboards that enable reliable data analysis, ongoing AI quality monitoring, and data-driven decision-making across the organization.
• Collaborate and innovate: Work closely with AI/ML Engineers and Product Managers to integrate your findings into product enhancements. Stay current with the latest advancements in AI evaluation, particularly in Large Language Models (LLMs) and speech systems, contributing to our overall technical strategy.
• Mentor and lead: Mentor junior data scientists, establish best practices, and raise the technical bar across the team.

Qualifications

• 5+ years of industry experience in data science, machine learning, or a related quantitative field.
• Bachelor's or Master's degree in Computer Science, Data Science, Statistics, Mathematics, or a related quantitative field.
• Strong proficiency in programming languages such as Python (with libraries like Pydantic, Pandas, NumPy, Scikit-learn).
• Strong foundation in statistical analysis, experimental design, hypothesis testing, and A/B testing methodologies.
• Experience working with large-scale datasets, data pipelines, and analytical tools to generate actionable insights.
• Familiarity with evaluation metrics (precision, recall, agreement metrics like Cohen's Kappa) to calibrate judge models against human ground truth.
• Demonstrated ability to independently own and drive projects from problem definition through execution and implementation.

Bonus Points

• If you have experience with Natural Language Processing (NLP) techniques and understanding of LLM architectures and their evaluation challenges.
• If you have experience with Speech Technologies and their evaluation.
• If you have experience in a regulated industry (e.g., healthcare, finance).
• If you are familiar with data governance principles, particularly concerning PII/PHI.
• If you have experience with MLOps practices and deploying models to production.
• If you are familiar with Langfuse, cloud platforms (GCP, AWS, Azure) and data platforms such as Databricks.

Pay and Benefits

We offer competitive salary and benefits, including 401k matching up to a certain percentage of your salary, health, vision, and dental insurance, and very flexible paid time off. The typical salary range for this role is $180k-230k USD. The amount offered will be determined by a variety of factors including but not necessarily limited to your individual skills, qualifications, and past experience relative to the requirements of the role.