Senior Data Scientist

Kroll•San Francisco, CA

19h•$60,000 - $150,000

About The Position

Kroll is hiring a Senior Data Scientist to join its Enterprise Data Group. This role is designed for an experienced practitioner who can lead end-to-end ML initiatives, mentor junior team members, and partner with business and engineering stakeholders to translate complex problems into production-grade data science solutions. Our program spans fintech product development, digital transformation, process automation with machine learning, business intelligence, data governance, and generative AI. You will work alongside an advanced data science and engineering team — and collaborate with professionals from the world's largest financial institutions, law enforcement agencies, and government bodies.

Requirements

Advanced degree (MS or PhD) in computer science, statistics, mathematics, analytics, or a related quantitative field
5+ years of applied machine learning experience, including delivering models to production
Strong Python skills and experience with the modern ML stack (scikit-learn, PyTorch or TensorFlow, pandas, Hugging Face Transformers)
Hands-on experience with Databricks (notebooks, jobs, MLflow, Unity Catalog) and Spark/PySpark
Production experience on Azure — ideally including Azure AI Foundry, Azure OpenAI Service, and Azure Data Lake
Breadth across ML domains: traditional/statistical ML, deep learning, NLP, and LLM/GenAI applications, including hands-on experience with prompt engineering, RAG, embeddings, and agentic workflows
Practical experience building LLM/GenAI applications — prompt engineering, RAG, fine-tuning, embeddings, vector databases, and evaluation
Solid grounding in the full ML lifecycle: data validation, feature engineering, model design, experimentation, deployment, and monitoring
Experience with structured and unstructured data, including text, documents, and semi-structured sources
Strong statistical foundation and ability to reason about uncertainty, bias, and model risk
Excellent technical and business communication skills

Nice To Haves

Experience in financial services, risk, compliance, or regulatory domains
Familiarity with MLOps tooling (MLflow, Docker, Kubernetes, Azure DevOps or GitHub Actions)
Hands-on experience with agentic AI frameworks (LangChain, LlamaIndex, Semantic Kernel), LLM evaluation tooling, and production deployment of GenAI applications
Knowledge of responsible AI practices, including fairness, explainability, and data privacy

Responsibilities

Design, research, implement, and evaluate machine learning solutions spanning traditional ML, deep learning, NLP, and LLM/GenAI applications
Build and fine-tune models — from gradient-boosted trees and classical statistical models to transformer-based architectures and retrieval-augmented generation (RAG) systems
Develop and optimize prompts, evaluation frameworks, and guardrails for LLM-powered applications
Engineer scalable data and ML pipelines in Databricks using PySpark, Delta Lake, and MLflow
Deploy, monitor, and maintain models in production on Azure (Azure AI Foundry, Azure OpenAI, Azure Functions, AKS), including CI/CD, model versioning, and drift detection
Validate model inputs, outputs, and business impact; establish robust testing and monitoring practices
Partner with engineering, product, and business stakeholders to scope problems and translate ML capabilities into measurable outcomes
Communicate technical concepts, tradeoffs, and results to non-technical audiences, including senior leadership and clients
Mentor junior data scientists and contribute to team standards around code quality, experimentation, and responsible AI