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Sr. Internal Auditor

Bi-State Development

St. Louis, MO · Posted September 18, 2026

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  • Audit

About the job

The Senior Internal Auditor performs advanced professional internal audit work involving audits of greater-than-normal complexity. This position is responsible for examining and evaluating management activities to ensure the reliability and integrity of information, compliance with policies, procedures, laws, and regulations, the safeguarding of Agency assets, and the economical and efficient use of resources. This role also supports the achievement of established goals and management objectives through independent analysis, evaluation, and recommendations. Job Responsibilities • Performs or leads audits, reviews, investigations, management studies, and other internal control–related activities as assigned. • Ensures audit engagements are completed within established budget and time constraints. • Develops audit programs that provide effective and comprehensive audit coverage. • Conducts entrance and exit conferences to clarify audit objectives and review findings, recommendations, and auditee responses. • Collects, analyzes, and evaluates data related to accounting practices, financial reporting, internal controls, and program operations to assess alignment with policies and procedures. • Identifies and documents root causes of issues to determine cause‑and‑effect relationships. • Develops recommendations to enhance operational efficiency, strengthen internal controls, and improve compliance. • Performs follow‑up reviews to assess the effectiveness of corrective actions and implemented recommendations. • Conducts fieldwork in a professional, competent, and well‑documented manner. • Prepares complete and accurate workpapers that provide evidential support for findings and recommendations. • Prepares and/or reviews detailed audit reports that clearly present findings, recommendations, and auditee responses. • Conducts special investigations involving sensitive or confidential matters with discretion and professionalism. • Identifies and recommends process improvements to enhance audit efficiency and support the Internal Audit Department’s audit plan. • Performs research on audit practices and public transportation industry issues to remain informed on developments affecting the Agency. • Assists external auditors with work related to the Agency’s annual audit.