Senior Internal Auditor
Core & Main • St Louis, MO • Full Time
Posted on Thu, Aug 20, 2026
Based in St. Louis, Core & Main is a leader in advancing reliable infrastructure™ with local service, nationwide®. As a specialty distributor with a focus on water, wastewater, storm drainage and fire protection products and related services, Core & Main provides solutions to municipalities, private water companies and professional contractors across municipal, non-residential and residential end markets, nationwide. With over 370 locations across the U.S., the company provides its customers local expertise backed by a national supply chain. Core & Main’s 5,700 associates are committed to helping their communities thrive with safe and reliable infrastructure. Visit coreandmain.com to learn more.
Job Summary
Responsible for planning, organizing, and executing on multiple projects including advisory reviews and risk-based audits of people, process (operational and financial) and technology changes. Responsible for identifying impacts to internal controls, process improvement opportunities and facilitating change cross functionally. Responsible for supporting internal audit department management in providing internal control advisory services, preparation, and delivery of recommendations to key business customers and monitoring progress on recommendations.
Major Tasks, Responsibilities and Key Accountabilities
- Project planning, execution, and delivering insightful feedback to management that highlights process gaps, control deficiencies and improvement opportunities.
- Develop risk perspectives and internal control recommendations based on thorough understanding of business processes and review work performed.
- Assist in preparation and formulation of deliverables (reports, memos, etc.) including recommendations designed to improve controls and/or methods of operation.
- Assist in the presentation of findings, recommendations, and corrective action plans to Management.
- Build detailed knowledge of branch operations, processes and systems across the organization including thorough understanding of sources of change.
- Act as a champion for internal control and risk concepts throughout the organization.
- Undertake other ad hoc, project and investigation work as required.
- Work independently and remain flexible to change based on the needs of the business.
Preferred Qualifications
- Prior auditing or consulting experience
- Strong finance/accounting experience including internal controls and SOX (Sarbanes Oxley Act) understanding
- Experience in reviewing operational processes and associated IT applications, products, and infrastructure
- Advanced excel skills including data analytics proficiency. Experience with Alteryx, SQL, PowerBI a plus
- Project management experience.
Education and Experience
- Typically requires BS/BA in a related discipline. Generally, 3-5 years of experience in a related field OR MS/MA and generally 2-3 years of experience in a related field.
Minimum Qualifications
- Must be a minimum of 18 years of age or older
- Must pass pre-employment assessment(s) if applicable
Environmental Job Requirements
- Occasional travel (10%-20% may be required)
- Located in a comfortable indoor area. Any unpleasant conditions would be infrequent and not objectionable.
This information indicates the general nature and level of work performed by associates in this role. It is not designed to contain a comprehensive inventory of all duties, responsibilities, and qualifications required of associates assigned to this role. This description supersedes any previous or undated descriptions for this role. Management retains the right to add or change the duties of the position at any time.
Core & Main is an Equal Employment Opportunity employer. Employment at Core & Main is based solely on a person’s merit and qualifications directly related to professional competence. Core & Main does not discriminate against any employee or applicant on the basis of race, creed, color, religion, national origin, nationality, ancestry, age, disability, veteran status, pregnancy or related condition (including breastfeeding), affectional or sexual orientation, gender identity or expression, marital status, status with regard to public assistance, citizenship, or any other basis protected by law.
None of the questions in this application are intended to elicit information regarding any protected characteristics, nor imply any limitation, illegal preferences or discrimination based upon non-job-related information or protected characteristics.
For more information, please click here or visit https://www.eeoc.gov
AuditFriendly salary estimate
The employer did not post a salary for this role. Based on AuditFriendly's salary intelligence model (comparable live postings, role, seniority, and location), we estimate base pay of $99,000–$117,000 per year (median ~$107,000). This is an AuditFriendly estimate, not an employer-provided figure.
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