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Data Scientist

HF Sinclair


Job Location:

Dallas, IA - USA

Monthly Salary: Not provided by the employer
Posted: 12 November 2026 (5 hours ago)
Application Deadline: 9 February 2027
Vacancies: 1 Vacancy

Job Summary

Basic Function
HF Sinclairs Data Scientistdevelops and continually improves production artificial intelligence (AI) and machine learning (ML) solutions that support enterprise decision-making and automation. This hands-on technical role spans business problem definition experimentation model development deployment and ongoing evaluation.

The role applies statistics traditional machine learning deep learning generative AI and agentic AI to enterprise use cases. The Data Scientist owns model development evaluation and continuous improvement; partners with engineering teams on deployment and operational controls; and mentors junior data scientists while collaborating with business and client-facing teams.

Job Duties
  • Translate business challenges into clearly defined AI/ML use cases measurable success criteria appropriate evaluation methods and feasible technical approaches.
  • Data quality and readiness: Assess data completeness accuracy representativeness and potential leakage before developing models.
  • Design train validate and optimize machine learning models using structured and unstructured data; conduct exploratory analysis feature engineering statistical testing and error analysis.
  • Evaluate adapt and fine-tune pre-trained models including NLP deep learning and large language models (LLMs) for specific enterprise and domain requirements.
  • Build and improve GenAI and Agentic AI solutions including retrieval-based workflows tool integration agent orchestration evaluation guardrails and human-in-the-loop review where appropriate.
  • Develop reproducible training and evaluation pipelines and work with engineering teams to productionize solutions with appropriate versioning deployment and operational controls.
  • Own continuous improvement of deployed models and AI agents: monitor accuracy reliability drift unexpected behavior latency and cost; investigate issues and drive model refinement or retraining.
  • Collaborate with data engineering application platform and business teams to deliver secure scalable explainable and maintainable solutions.
  • Apply responsible AI practices including transparency model observability governance documentation and appropriate privacy and risk controls.
  • Document architectural choices experiments model limitations and reusable approaches; conduct technical reviews and mentor junior data scientists.
  • Communicate results trade-offs risks and business impact to technical and non-technical stakeholders; contribute technical expertise to solution design and presales discussions.

Special assignments or tasks assigned to the employee by their supervisor as determined from timeto time in their sole and complete discretion.

Experience
  • Six or more years of hands-on experience in applied data science machine learning or AI including responsibility for model development and production deployment or support.
Education Level
A minimum of a Bachelors Degree in Chemical Engineering Mechanical Engineering Computer Science or other related fields or equivalent work experience in lieu of a four-year degree is required
Required Skills
    • Proficiency in Python and SQL with practical experience in data processing model development and machine learning libraries such as pandas scikit-learn PyTorch or TensorFlow.
    • Ability to apply statistical methods supervised and unsupervised learning feature engineering experiment design model selection and rigorous evaluation.
    • Hands-on experience with NLP and generative AI techniques including LLMs prompt engineering retrieval-augmented generation and model adaptation or fine-tuning.
    • Experience developing or integrating AI agents and evaluating their quality reliability and behavior in enterprise workflows.
    • Understanding of production machine learning practices including reproducible pipelines model registries versioning monitoring troubleshooting and retraining.
    • Experience working with complex structured and unstructured datasets.
    • Familiarity with cloud services such as AWS Azure or Google Cloud Platform (GCP) application programming interfaces (APIs) and container-based deployment concepts.

    Preferred Skills:

    • Familiarity with production machine learning tools such as MLflow or Kubeflow.
    • Exposure to Snowflake or similar enterprise data platforms.
    • Familiarity with Docker Kubernetes or continuous integration and continuous delivery (CI/CD) practices.
    • Experience with LLM observability and evaluation tools such as LangSmith or Langfuse and with enterprise AI security and governance requirements.
    • Analytical and problem-solving skills including the ability to translate ambiguous requirements into practical measurable solutions.
    • Technical ownership and engineering judgment including the ability to balance model quality explainability delivery effort and operating constraints.
    • Clear communication client and stakeholder engagement cross-functional collaboration and technical mentorship skills.
    • Curiosity and adaptability with a disciplined approach to evaluating and applying emerging AI capabilities.
Benefits
HF Sinclair offers a comprehensive benefits package designed to support the well-being of our employees and their families. Our benefits include but are not limited to the following:

  • Medical Insurance
  • Vision Insurance
  • Dental Insurance
  • Paid Time-Off
  • 401(k) Retirement Plan with match
  • Educational Reimbursement
  • Parental Bonding Time
  • Employee Discounts

We are committed to fostering a supportive and inclusive work environment ensuring our employees have the resources needed to thrive professionally and personally. Benefit eligibility is governed by official plan documents for more details visitTotal Rewards.
Our One HF Sinclair Culture:
At HF Sinclair we are united through our One HF Sinclair Culture which is underpinned by our five core values of Safety Integrity Teamwork Ownership and Inclusion. Developed to empower our people our five core cultural values are at the heart of everything we do and extend to how we engage our stakeholders. These values influence our decisions shape our behaviors and keep us connected across the entire organization. We maintain a true Safety culture for our employees communities environments and customers. Our goal is to make sure everyone returns home safely each day. We have a long-standing commitment to Integrity and ethical behavior and do what is right for our employees investors communities and the environment. We encourage employees to Step Up and Stand Out by championing a culture of Teamwork and Ownership. We foster a culture of Inclusion by encouraging diversity of experiences viewpoints and backgrounds. What makes each of us different together makes us stronger.
About HF Sinclair Corporation
HF Sinclair Corporation headquartered in Dallas Texas is an independent energy company that produces and markets high-value light products such as gasoline diesel fuel jet fuel renewable diesel and lubricants and specialty products. HF Sinclair owns and operates refineries located in Kansas Oklahoma New Mexico Wyoming Washington and Utah. HF Sinclair provides petroleum product and crude oil transportation terminalling storage and throughput services to our refineries and the petroleum industry. HF Sinclair markets its refined products principally in the Southwest U.S. the Rocky Mountains extending into the Pacific Northwest and in other neighboring Plains states and supplies high-quality fuels to more than 1750 branded stations and licenses the use of the Sinclair brand to more than 350 additional locations throughout the country. HF Sinclair produces renewable diesel at two of its facilities in Wyoming and also at its facility in New addition subsidiaries of HF Sinclair produce and market base oils and other specialized lubricants in the U.S. Canada and the Netherlands and export products to more than 80 countries.
Equal Opportunity Employer

HF Sinclair Corporation is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race color religion sex sexual orientation gender identity national origin age disability veteran status or any other prohibited ground of discrimination.


Required Experience:

IC


About Company

An independent petroleum refiner in the United States with operations throughout the mid-continent, southwestern and Rocky Mountain regions. Subsidiaries of HollyFrontier produce and market gasoline, diesel, jet fuel, asphalt, heavy products and specialty lubricant products. Additiona ... View more

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