ZoomInfo

Principal Machine Learning Engineer

ZoomInfo • $192K — $302K *
Information Technology
5 - 7 years of experience
Job Overview by Ladders

Qualifications

  • Proven experience setting technical direction across teams for machine learning systems in production.
  • Strong expertise in classical machine learning, applied statistics, and language processing at scale.
  • Established evaluation standards for complex systems, influencing beyond own team.
  • Track record of implementing impactful building or measuring changes adopted by other teams.
  • In-depth decision-making experience for cost and capacity in model training/serving.
  • Proficient in Python for production use and skilled in SQL with distributed data processing knowledge.

Responsibilities

  • Set the technical strategy for the data graph, entity resolution, and buying intent.
  • Frame and deliver solutions for previously unaddressed problems, like semantic intent at web scale.
  • Define evaluation standards for technical systems, including sampling methodology and validated models.
  • Establish agreements between data contracts and the agents consuming them to ensure cost-effectiveness.
  • Create baseline decisions that standardize performance metrics and reporting methods.
  • Conduct design reviews, mentor engineers, and advocate for the team to leadership.

Benefits

  • Comprehensive benefits package focusing on health and wellness.
  • Holistic mind, body, and lifestyle programs for employee well-being.
  • Remote work flexibility.
  • Opportunities for professional development.
Full Job Description
You'll set the technical direction for the intelligence layer every ZoomInfo AI agent reasons over - what's true about companies and the people in them, how they relate, and what they're buying. As a senior individual contributor with no direct reports, you will own strategy across the data graph, entity resolution, and buying intent, staying hands-on in the hardest of these problems. You'll decide when classical machine learning, statistics, or language models is the right tool, and turn good judgment into standards other teams adopt.

What You'll Do
  • You will set technical strategy for the data graph, entity resolution, buying intent, and agent context, deciding which problems to take on, in what order, and how the pieces connect.
  • You will frame and ship problems nobody has framed yet, such as extraction for companies with no public footprint or semantic intent at web scale, deciding what not to build as deliberately as what to build.
  • You will define evaluation standards that other teams adopt, including sampling methodology, human labels, validated LLM judges, and release gates, and know where each one breaks.
  • You will define the data contracts between the data graph, intent signals, and the agents that consume them, including agent memory, keeping the system cost-effective to run across the full dataset.
  • You will turn good choices into defaults across the group: the baseline every model must beat, how uncertainty is reported, and which metrics get retired when they mislead.
  • You will lead design reviews, mentor senior engineers, shape hiring, and represent the team's technical judgment to product and leadership.

What You Bring

Must-Have:
  • You have set technical direction as an individual contributor for a problem area spanning more than one team, with the resulting machine learning systems in production and owned after launch - depth of impact matters more than years or past titles.
  • You bring breadth across classical machine learning on large, messy tabular data, applied statistics, language processing at scale, and LLM agents or multi-step systems, with recognized depth in at least one.
  • You have defined and driven adoption of evaluation standards beyond your own team for systems with no single right answer, including LLM judges validated against human labels and results reported with their limits.
  • You have a track record of changing how a group builds or measures - for example, introducing a baseline or review practice that other teams now use.
  • You have made cost and capacity decisions for model training and serving, including when to self-host, distill, or call a hosted model, with cost tracked per unit of work.
  • You are hands-on in production Python and strong SQL with distributed data processing experience, and you use AI coding tools daily with rigorous review of their output.

Preferred:
  • You have experience with ranking and retrieval, including embeddings, learned re-ranking, and metrics such as recall[redacted], MRR, and nDCG.
  • You bring entity resolution, knowledge graph, or web-scale information extraction experience on messy, real-world data.
  • You have trained and served open-weight models in PyTorch or an equivalent framework, including GPU capacity planning.
  • You have built user memory or context systems for agents, or defended LLM systems against adversarial inputs and prompt injection.


#LI-Remote

#LI-VC1

Actual compensation offered will be based on factors such as the candidate's work location, qualifications, skills, experience and/or training. Your recruiter can share more information about the specific salary range for your desired work location during the hiring process. We want our employees and their families to thrive.

In addition to comprehensive benefits we offer holistic mind, body and lifestyle programs designed for overall well-being. Learn more about ZoomInfo benefits here.

Below is the US base salary for this position. Additional compensation such as Bonus, Commission, Equity and other benefits may also apply.

$192,500-$302,500 USD

About ZoomInfo

About ZoomInfo

A Leader in B2B Data

ZoomInfo has revolutionized how businesses access B2B data since its inception in 2000. With a rich database encompassing over 14 million companies and 120 million professionals, ZoomInfo stands as a pivotal resource for sales, marketing, recruiting, and business development professionals worldwide.

Headquarters and Global Reach

Based in Vancouver, Washington, ZoomInfo's influence spans globally, aiding countless professionals in navigating the complex business landscape with ease and precision.

Career Opportunities at ZoomInfo

A Spectrum of Roles

ZoomInfo's commitment to innovation and customer success fuels a wide range of career opportunities, from technical positions to sales and marketing roles.

Why Choose ZoomInfo

Working at ZoomInfo means being part of a team dedicated to excellence, innovation, and the democratization of B2B data.

The Job Application Process

Your Path to ZoomInfo

Navigating the job application process at ZoomInfo is streamlined for efficiency, transparency, and accessibility.

Submitting Your Application

Visit Zoominfo’s official website for information about how to apply. Visit the Ladders’ blog for tips on crafting a compelling application, from tailoring your resume to making a lasting impression in your cover letter.

Available Positions

Roles that Drive Success

Discover the high-demand positions at ZoomInfo that align with your career aspirations and expertise.

High-Paying Opportunities

A closer look at roles offering competitive salaries for ambitious job seekers.

Job Requirements and Qualifications

What ZoomInfo Looks For

Zoominfo is constantly searching for talented individuals with unique skills, experience, and qualifications. If you believe you have the right skills, visit Zoominfo’s website for more information about where to apply.

Skills That Shine

Skills in sales, marketing, and data analysis are always valuable to business. However, it’s recommended you contact Zoominfo’s human resources department for more information about which specific skills they are looking for right now.

Employee Benefits and Perks

Rewarding Your Contribution

ZoomInfo values its team, offering a comprehensive benefits package designed to support and enrich the lives of its employees.

Beyond the Basics

From health and wellness to flexible work arrangements, explore the benefits that make ZoomInfo a top employer.

Training and Development Programs

Investing in Your Growth

Commitment to employee development stands at the core of ZoomInfo's ethos, with programs designed to foster professional growth and advancement.

Paths to Advancement

Visit Zoominfo’s website for detailed insight into training opportunities that prepare employees for success and leadership roles within the company.

Employee Testimonials

Real Stories of Growth and Success

Hear directly from ZoomInfo employees about their experiences, growth, and the opportunities they've seized during their tenure by visiting their profile on Glassdoor.

A Culture of Excellence

Most accounts describe ZoomInfo's dynamic work environment as a collaborative culture that’s committed to employee satisfaction.
Learn more about ZoomInfo
Size
2,742 employees
Market Cap
$11.5 billion
Industry
Net Income
-$9.1 million
Founded
2000
Revenue
$476.2 million
NASDAQ

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