Jessica Mierkey
Walsenburg
Summary
Experienced finance professional prepared for role with strong skills in accounts payable management, vendor relations, and financial analysis. Known for fostering collaborative team environments and consistently achieving results.
Overview
16
16
years of professional experience
Work History
Senior Accounts Payable Analyst
Lightsourcebp
12.2022 - Current
- Oversee full-cycle AP process, including vendor onboarding, invoice processing, employee expenses, purchase cards, multi-currency payments, and bank reconciliations.
- Lead month-end, quarter-end, and year-end close processes, preparing journal entries, reconciling accounts, and generating detailed AP reports.
- Act as subject matter expert for the AP team, mentoring junior staff, resolving escalations, and streamlining AP procedures.
- Spearhead automation initiatives, reducing invoice processing time by 35% through system upgrades and workflow redesign.
- Collaborate with Finance, Procurement, and Treasury teams to resolve discrepancies, improve reporting, and drive operational excellence.
- Partner with IT for ERP system implementation, data migration, and system testing to ensure smooth transitions and functionality.
- Lead P2P training sessions for new hires and conduct ad hoc business training sessions as needed.
Accounts Payable Analyst
Marathon Petroleum Company
02.2015 - 06.2022
- Administer Purchase Card program for approximately 700 employees, auditing expense reports, resolving disputes, and supporting cardholders.
- Reconcile monthly purchase card bank statements and submit purchase card accruals for timely financial reporting.
- Prepare GAP Audit reports and monthly KPIs for finance leadership, ensuring transparency and accuracy.
- Manage vendor setups and ensure compliance with company policies and tax regulations.
- Support month-end close activities by preparing journal entries, processing reclassifications, and validating general ledger coding.
- Perform daily bank statement reconciliations, identifying and resolving discrepancies.
- Review and clean up GL cross-validation errors to maintain data integrity and compliance.
- Handle weekly payment processes, including ACH, wire transfers, outsourced check printing, and in-house check disbursements.
- Prepare and post treasury wire entries, ensuring proper cash management procedures are followed.
- Collaborate with IT on Oracle ERP system testing, including validations and user acceptance testing (UAT).
- Provide backup support for Purchase Order (PO) resolution, assisting with invoice matching and discrepancy resolution.
Office Manager
Marathon Petroleum Company
02.2014 - 02.2015
Accounts Payable Full Cycle
McCandless Truck Center
05.2009 - 02.2014
Education
BBA -
CSU Global
2029
Skills
- Full-Cycle Accounts Payable
- Month-End/Quarter-End/Year-End Close
- Team Leadership & Mentorship
- ERP & AP Systems (eg, SAP, Oracle)
- AP Automation & Process Improvement
- Financial Reporting & Analysis
- Cross-Functional Collaboration
- Internal & External Audit Support
- Internal controls
Timeline
Senior Accounts Payable Analyst
Lightsourcebp
12.2022 - Current
Accounts Payable Analyst
Marathon Petroleum Company
02.2015 - 06.2022
Office Manager
Marathon Petroleum Company
02.2014 - 02.2015
Accounts Payable Full Cycle
McCandless Truck Center
05.2009 - 02.2014
BBA -
CSU Global
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