Senior Machine Learning Engineer
Salary$128k – $201k
LocationRemote-US-MA, Bethesda, Maryland, United States; Remote-US-MA; Remote-US-MD; Remote-US-WA; Vancouver, Washington, United States; Waltham, Massachusetts, United States
Work moderemote
Typefull-time
SenioritySenior
Department867 Engineering - Data Science
EquityIncluded
Company size1,001–5,000 people
PostedSep 21, 2026 · 3w ago
Verified live19h ago
At a glanceSummarised by Seekless from the posting.
Taken machine learning systems to production and owned them after launch
Classical machine learning expertise beyond language models, including supervised learning and feature engineering on large, messy tabular data
Applied statistics: experiment design, statistical inference, and calibrated scores under class imbalance
Deployed language processing at scale — text classification, information extraction, and entity linking over large volumes of multilingual, noisy text
Built LLM agents or multi-step systems in production, including tool and context design and failure analysis from traces
Evaluated systems with no single right answer using LLM judges validated against human labels
Proficient in production Python
Strong in SQL
Experience with distributed data processing
Uses AI coding tools daily, rigorously reviewing their output
Experience with ranking and retrieval, including embeddings, learned re-ranking, and metrics such as recall@k, MRR, and nDCG
Experience in propensity modeling, clustering, or entity resolution on messy, real-world data
Trained and served open-weight models in PyTorch or an equivalent framework, with cost tracked per unit of work
Defended LLM systems against adversarial inputs and prompt injection
Worked on web-scale information extraction, knowledge graphs, or user memory for agents
Skills
Python
SQL
PyTorch
gradient-boosted trees
regression
LLM
AI coding tools
Benefits
Health insurance
Equity
Bonus
Commission
About the company
ZoomInfo is where careers accelerate. We move fast, think boldly, and empower you to do the best work of your life. You’ll be surrounded by teammates who care deeply, challenge each other, and celebrate wins. With tools that amplify your impact and a culture that backs your ambition, you won’t just contribute. You’ll make things happen–fast.
About the role
You’ll help build the intelligence every ZoomInfo AI agent reasons over — what’s true about companies and the people in them, how they relate, and what they’re buying. You’ll own outcomes end to end, from the data a model learns from to the product surface where its output lands, applying classical machine learning, statistics, or language models based on what the problem calls for. You’ll take a problem in the data graph, entity resolution, or buying intent from design through production, and own it after launch.
What You’ll Do
•
You will extract leadership, locations, and products from the websites of companies with almost no public footprint, and detect stale records, choosing which pages to read based on cost per document.
•
You will estimate headcount and revenue for companies with sparse public information, using gradient-boosted trees, regression with missing inputs, and calibrated uncertainty.
•
You will determine whether two records describe the same company or person, measuring both false merges and false splits.
•
You will infer buying intent from the meaning of what companies read, not keyword matches, across large volumes of multilingual, noisy text, feeding propensity scoring, lookalike retrieval, and contact recommendations.
•
You will build research agents that cite their sources, along with the evaluation systems behind them: human labels, validated LLM judges, and regression gates.
•
You will train small, task-specific models distilled from larger ones, measuring them against the larger model rather than against perfection, and own their quantization and serving.
•
You will take a problem from design to production and own it after launch, including its evaluation and its cost, while helping other engineers improve their work through design and code review.
What You Bring
Must-Have:
•
You have taken machine learning systems to production and owned them after launch, following the outcome into whichever layer it needs — depth matters more than years.
•
You bring classical machine learning expertise beyond language models, including supervised learning and feature engineering on large, messy tabular data, along with applied statistics: experiment design, statistical inference, and calibrated scores under class imbalance.
•
You have deployed language processing at scale — text classification, information extraction, and entity linking over large volumes of multilingual, noisy text.
•
You have built LLM agents or multi-step systems in production, including tool and context design and failure analysis from traces, and you’ve evaluated systems with no single right answer using LLM judges validated against human labels.
•
You are proficient in production Python and strong in SQL, with experience in distributed data processing, and you use AI coding tools daily, rigorously reviewing their output.
Nice to have
Preferred:
•
You have experience with ranking and retrieval, including embeddings, learned re-ranking, and metrics such as recall@k, MRR, and nDCG.
•
You bring experience in propensity modeling, clustering, or entity resolution on messy, real-world data.
•
You have trained and served open-weight models in PyTorch or an equivalent framework, with cost tracked per unit of work.
•
You have defended LLM systems against adversarial inputs and prompt injection, or worked on web-scale information extraction, knowledge graphs, or user memory for agents.
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.
Benefits
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.
$128,100—$201,300 USD
About us:
ZoomInfo (NASDAQ: GTM) is the Go-To-Market Intelligence Platform that empowers businesses to grow faster with AI-ready insights, trusted data, and advanced automation. Its solutions provide more than 35,000 companies worldwide with a complete view of their customers, making every seller their best seller.
Legal
ZoomInfo is committed to protecting your privacy when you apply for jobs with us. Please review our Job Applicant Privacy Notice for more details on how we handle your personal information.
ZoomInfo may use a software-based assessment as part of the recruitment process. More information about this tool, including the results of the most recent bias audit, is available here.
ZoomInfo is proud to be an equal opportunity employer, hiring based on qualifications, merit, and business needs, and does not discriminate based on protected status. We welcome all applicants and are committed to providing equal employment opportunities regardless of sex, race, age, color, national origin, sexual orientation, gender identity, marital status, disability status, religion, protected military or veteran status, medical condition, or any other characteristic protected by applicable law. We also consider qualified candidates with criminal histories in accordance with legal requirements.
For Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. ZoomInfo does not administer lie detector tests to applicants in any location.