Senior Data Scientist - GenAI & Production ML

HF Sinclair; Dallas (TX); On-site; USD 120,000 - 170,000; Full time

Benefits offered by this job

Medical Insurance

Vision Insurance

Paid Time‑Off

401(k) Retirement Plan with match

Educational Reimbursement

Parental Bonding Time

Employee Discounts

Job summary

HF Sinclair Corporation, based in Dallas, seeks a Data Scientist who will own model development, evaluation, and continuous improvement across enterprise AI/ML. You will partner with engineering for deployment and guardrails, mentor junior data scientists, and collaborate with business and client-facing teams.

The role requires 6+ years in applied data science or AI, with a strong background in Python/SQL, NLP/LLMs, and production ML practices.

Qualifications

• Proficiency in Python and SQL with experience in data processing, model development, and ML libraries.
• Statistical methods, supervised/unsupervised learning, feature engineering, experimentation and evaluation.
• Hands-on NLP and Generative AI techniques including LLMs, prompts, retrieval-augmented generation.
• Experience developing or integrating AI agents and evaluating their quality in enterprise workflows.
• Understanding production ML practices: reproducible pipelines, versioning, monitoring and retraining.
• Experience with structured and unstructured data sets.
• Familiarity with AWS/Azure/GCP, APIs, and container-based deployment.

Responsibilities

• Translate business challenges into AI/ML use cases with measurable success criteria.
• Assess data quality and readiness before model development.
• Design, train, validate, and optimize ML models using diverse data.
• Evaluate and refine pre-trained models including NLP/LLMs for enterprise needs.
• Build GenAI/Agentic AI solutions with retrieval, tools, and guardrails.
• Develop reproducible training/evaluation pipelines and work with engineering for deployment.
• Monitor model performance, drift, latency, and cost; retrain as needed.
• Collaborate with data engineering, product, and business teams for secure, scalable solutions.
• Apply responsible AI practices: governance, documentation, privacy and risk controls.

Skills

Python/SQL

Data processing

Pytorch/TensorFlow

NLP/LLMs

AI agents/GenAI

Model deployment/ops

Cloud services (AWS/Azure/GCP)

APIs & container deployment

Model monitoring/testing

Explainability/governance

Education

Bachelor’s degree in Chemical Engineering, Mechanical Engineering, Computer Science or related fields

Tools

pandas

scikit-learn

PyTorch

TensorFlow

MLflow/Kubeflow

Snowflake

Docker/Kubernetes

Job description

HF Sinclair Corporation, based in Dallas, seeks a Data Scientist who will own model development, evaluation, and continuous improvement across enterprise AI/ML. You will partner with engineering for deployment and guardrails, mentor junior data scientists, and collaborate with business and client-facing teams.

The role requires 6+ years in applied data science or AI, with a strong background in Python/SQL, NLP/LLMs, and production ML practices.