Position Summary:

At MPC, we’re committed to being a great place to work – one that welcomes new ideas, encourages diverse perspectives, develops our people, and fosters a collaborative team environment. As an energy industry leader, our career opportunities fuel personal and professional growth.

The Staff Auditor is responsible for executing financial, operational, compliance, and special audits across MPC and MPLX business activities in accordance with the International Standards for the Professional Practice of Internal Auditing and enterprise methodology. This role supports the full audit lifecycle—including planning, risk assessment, testing, and reporting—to evaluate the effectiveness of controls and identify risks that may impact the control environment, financial integrity, or achievement of business objectives.

The position partners with audit leads, management, and business stakeholders to support audit scoping, perform testing, document workpapers, and communicate observations. The Staff Auditor also contributes to advisory reviews for new processes and systems, applies data analytics to enhance audit effectiveness, and ensures all audit work is completed accurately, thoroughly, and in alignment with departmental standards.

Key Responsibilities:

• Perform Staff Auditor functions for financial, operational, compliance, and special audits on MPC’s and MPLX’s business activities in accordance with International Standards for the Professional Practice of Internal Auditing and enterprise methodology to identify risks and controls that may have an impact on the integrity of the control environment, integrity of financial information, or achievement of business objectives.

• Assists in team planning efforts by conducting business unit interviews and preparing walkthroughs. Participates in opening and closing conferences. Keeps the audit lead and audit manager informed of audit status and responds accordingly to supervisor review and feedback.

• Starts to ensure risks are appropriately identified, ranked, and articulated in the Risk and Control Matrix (RACM), and the audit is appropriately scoped to include relevant risks/controls for testing. Actively Participates in advisory reviews for new processes and systems design to provide an independent assessment of project management and control effectiveness.

• Assist with designing and documenting an appropriate audit program and test plan to address all risks in assigned areas. Completes testing and gathers sufficient evidence of control execution and including use of data analytics to select the optimal samples for testing. Validates potential exceptions with audit clients and performs self-review of work.

• Logically and concisely documents work / testing performed to support observations and conclusions utilizing established documentation protocol.

• Document test of control results logically and concisely in conformance with department methodology; annotate workpapers sufficiently to support Lead and Manager reviews; ensure conclusions reached on control effectiveness are sufficiently supported.

• Starts to identify opportunities to leverage data analytics to facilitate more meaningful audit scoping and test procedures (e.g., stratification and selection of a high-risk audit sample, full population testing, etc.); engage with the DT&I Team to retrieve the data needed for analysis and leverage the use of current analytics tools.

• Document complete and accurate observations (on control design and effectiveness), communicate control observations with audit clients prior to the exit meeting and present audit observations in closing conferences.

Minimum Experience Requirements:

• Bachelor's degree in Accounting, Audit, related field required.

• Two (2) years of audit, accounting or business experience required.

• Professional Certifications are preferred: Certified Public Accounting (CPA)Certified Internal Auditor (CIA),Certified Fraud Examiner (CFE),or other related industry certifications.

• Large company experience may be preferred.

Travel

• Up to 15%

As an energy industry leader, our career opportunities fuel personal and professional growth.

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