Data Scientist, Applied AI

About Definitive Healthcare :

At Definitive Healthcare, our mission is simple: to connect with the real people who make healthcare happen. With real data on real people, our customers get the Definitive picture of the Healthcare market to move their businesses and organizations forward.

We’re committed to delivering the industry’s most reliable, actionable, and differentiated insights and empowering the innovators and organizations transforming healthcare. Because when our customers succeed, healthcare improves—for everyone.

Since our founding in 2011, we’ve grown into a global company headquartered just outside Boston, Massachusetts, supporting more than 2,100 customers around the world. Along the way, we’ve built a culture centered on purposeful work, collaboration, curiosity, and meaningful impact.

We’re passionate about the work we do and the people we do it with. Through programs like Definitive Cares and our employee-led affinity groups, we create opportunities for our teams to connect and give back to the communities where we live and work.

About the position:

This role supports the team's work on practical generative AI applications. The Data Scientist implements and tests LLM, RAG, and agent-based workflows for assigned use cases under the direction of senior team members, producing evidence that informs team decisions about which approaches to use.

What y ou’ll do :

• Develop AI workflows: Build and test LLM, RAG, and tool-using agent workflows for assigned use cases.
• Evaluate approaches: Compare LLMs, embedding models, and retrieval methods against quality, reliability, latency, and cost, using evaluation criteria and methods set by senior team members.
• Maintain evaluation assets: Create and update representative test cases, benchmark datasets, and regression checks; report results and limitations.
• Improve retrieval quality: Develop and tune RAG pipelines, including embeddings, retrieval, reranking, and grounding, based on evaluation results.
• Investigate failures: Review incorrect answers, retrieval misses, and workflow failures; implement and measure improvements.
• Support production workflows: Use experimentation, tracing, and observability tools to help monitor systems and investigate performance changes.
• Collaborate on delivery: Work with engineering, product, and domain partners to clarify requirements, communicate findings, and deliver practical AI solutions.

What you'll need:

Education and experience

• Bachelor’s degree in a quantitative or technical field.
• 3+ years of experience in data science, machine learning, applied AI, or a related field.
• Hands-on experience developing applications with LLMs and evaluating their outputs.

Technical and professional skills

• Strong Python, data analysis, and problem-solving skills.
• Understanding of embeddings, semantic search, retrieval, RAG and evaluation metrics.
• Experience with an agent framework such as PydanticAI, LangGraph, or a similar tool.
• Ability to design useful test cases, interpret evaluation results, and identify limitations.
• Familiarity with cloud data or ML platforms, Git, testing, and collaborative software development.
• Clear communication with technical and nontechnical colleagues.
• Experience with Databricks, evaluation platforms, production deployment, fine-tuning, distributed processing, or healthcare data is beneficial but not required.

Autonomy, decisions, and scope

• This is an individual contributor role with no people-management responsibilities.
• Works independently on defined analyses and implementation tasks, with guidance on project priorities and broader technical direction.
• Makes day-to-day decisions about experiments, test cases, and implementation details within agreed project goals.
• Recommends model and retrieval improvements based on results; escalates major architecture changes, sensitive-data concerns, significant cost implications, and production release decisions to senior team members or the appropriate owners.
• Influences assigned projects through implementation and evidence, rather than owning the evaluation strategy or technical direction across multiple projects.

Compensation and Benefits:

The salary range for this position is $111,000– $167,000 per year, which represents the base pay the company reasonably and in good faith expects to pay for this role. Actual pay within this range will be determined based on factors such as relevant experience, skills, and qualifications.

Depending on the position, employees may also be eligible to participate in a company bonus or commission plan. All employees are eligible for a comprehensive benefits package, including medical, dental, and vision coverage, flexible paid time off, and participation in the company’s 401(k) plan with employer contribution.

Why we love Definitive Healthcare , and why you will too!

At Definitive Healthcare, our values shape how we work, how we treat one another, and how we deliver for our customers.

• We’re obsessed with data . Great companies are built on data customers can rely on. As responsible stewards, we validate rigorously, question assumptions, and use data to make better decisions.

• We’re accountable . We take ownership of results, not just tasks. When something needs doing, we step up. When things break, we fix them. We follow things through until the job is done.

• We care deeply. About our teammates, our customers, and the impact of what we build. We assume good intent, communicate openly, and support each other through challenges. We always bring maximum energy to everything we do.

We're also committed to creating an environment where our people feel supported in their work, their wellbeing, and their financial future.

• We invest in our people. We offer a competitive benefits package, including comprehensive healthcare benefits and a 401(k) match.

• We make room for connection and impact. Definitive Cares is our 100% employee-driven program that creates opportunities to connect with colleagues through affinity groups and make a positive impact on our communities.

• We’re a great place to work. In 2024 and 2025, we earned multiple workplace honors, including Built In’s 100 Best Places to Work in Boston (both years), a Stevie Bronze Award for Great Employers, and recognition as a Great Place to Work in India.

What our Employees are saying about us on Glassdoor:

“Great Work atmosphere, great work life balance, excellent company to work for, amazing top notch product, incredible customer service, lots of tools to help you succeed.”

-Business Development Manager

“Great team. Amazing growth. Employees are treated very well.”

-Research Analyst

“I have waited 36 years to work at a dream job for a dream company, and I am so happy to have finally got there.”

-Profile Analyst

If you don’t fit all of these qualifications, but believe you’re still a great fit, feel free to apply and tell us why in your cover letter.

If you are a California, Colorado, New York City or Washington resident and this role is a remote role, you can receive additional information about the compensation and benefits for this role, which we will provide upon request.

Definitive Hiring Philosophy

Definitive Healthcare is an equal opportunity employer that celebrates diversity and is committed to creating an inclusive workplace with equal opportunity for all applicants and teammates. Our goal is to recruit the most talented people from a diverse candidate pool regardless of race, color, religion, age, gender, gender identity, sexual orientation or any other status. If you’re interested in working in a fast growing, exciting working environment – we encourage you to apply!