Senior Machine Learning Engineer

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.

The Applied AI team builds the intelligence layer that sits between ZoomInfo's high-quality data and the application and agentic layer through which customers engage. Using a product-led growth model, this team leverages customer engagement as input to build better recommendations, scoring, classification, and generative models.

Recommendation system

• Build large scale recommendation systems utilizing embeddings generated for structured and unstructured data using methods such as a two tower architecture

• Performant recommendation designs which can scale to millions of recommendations per day for different product features

• Utilize graph based structures, search and scoring to enhance recommendation quality

Advanced NLP & Embedding Systems

• Fine-tune (LORA/PEFT), customize and deploy embedding models (LLMs/SLMs) for multi-language text understanding and semantic search

• Architect vector search solutions that enable language-agnostic clustering and classification across global datasets

• Build and optimize high-performance retrieval systems using vector databases

• Architect and manage scalable MLOps and LLMOps infrastructure for robust model training, evaluation, deployment, and monitoring systems.

• Design comprehensive CI/CD pipelines, implement model monitoring frameworks to identify drift patterns, and ensure high availability and fault tolerance.

• Help establish metrics, experimentation frameworks, and statistical validation approaches for AI system performance

Agentic Workflows & Evaluation

• Design and implement agentic systems for automated web extraction, NER, and entity resolution tasks

• Build comprehensive evaluation frameworks for agent performance across data acquisition and processing workflows

• Create feedback loops that continuously improve agent decision-making and data quality outcomes

• Build, and scale MCP servers and integrate them into broader AI and product ecosystems

Cross-Functional Collaboration

• End to end ownership of production workflows with close collaboration across engineering teams managing data, application, API and MCP layers to ensure models integrate seamlessly and scale with business needs

• Work with Product Management to translate business requirements into scalable ML solutions

• 6+ years hands-on ML/NLP experience (or 3+ years post-PhD/Master's) with at least two delivered, revenue-impacting products in production environments

• Expertise in modern AI architectures including transformer stacks, prompt engineering, RAG systems, vector-based information retrieval and context engineering

• Proven track record building and managing production systems by architecting and deploying scalable distributed systems of REST & MCP based microservices for applications and agents with observability and monitoring of latency, token utilization and system reliability

• Strong applied research capabilities (PyTorch or TensorFlow) paired with software-engineering rigor (Python) and familiarity with open weight LLMs (QWEN, Gemma, OSS) and embedding models and