Accounts Payable Manager

Mariana Minerals • Houston, TX

1d

About The Position

Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.

We are seeking an experienced Accounts Payable Manager to lead Mariana Minerals’ accounts payable operations and help build a scalable, technology-enabled procure-to-pay function. This position is responsible for ensuring the timely and accurate processing of supplier invoices, compliance with company purchasing policies and internal controls, and leading a high-performing AP team.

The ideal candidate combines strong operational accounting experience with a continuous-improvement mindset and enjoys building efficient processes that leverage automation. As Mariana continues to grow, this role will play a key part in implementing best-in-class procure-to-pay practices, improving vendor relationships, strengthening internal controls, and supporting the company’s readiness for continued growth.

This role will work closely with Procurement, Operations, Accounting, Treasury, FP&A, and business leaders across multiple operating locations.

Requirements

• Bachelor’s or Associate’s degree in Accounting, Finance, Business Administration, or a related field
• Five or more years of progressive Accounts Payable experience, including at least two years supervising or leading AP staff
• Experience in manufacturing, mining, energy, industrial, construction, or another asset-intensive industry is preferred
• Strong understanding of procure-to-pay processes, invoice matching, vendor management, and payment controls
• Experience with ERP systems such as Odoo, NetSuite is preferred
• Experience with AP automation platforms and OCR technologies is highly desirable
• Strong knowledge of internal controls, segregation of duties, and financial compliance
• Experience implementing process improvements and automation initiatives
• Excellent organizational skills and the ability to manage competing priorities in a fast-paced environment
• Strong analytical, problem-solving, interpersonal, and communication skills

Nice To Haves

• Experience in manufacturing, mining, energy, industrial, construction, or another asset-intensive industry is preferred
• Experience with ERP systems such as Odoo, NetSuite is preferred
• Experience with AP automation platforms and OCR technologies is highly desirable

Responsibilities

• Supervise and assist in the daily processing of vendor invoices across multiple legal entities.
• Ensure invoices are processed accurately, completely, and in accordance with company policies and payment terms.
• Ensure three-way matching of purchase orders, goods receipts, and vendor invoices.
• Review invoice coding for accuracy, including general ledger accounts, departments, projects, entities, and budget classes.
• Manage invoice queues and ensure service-level expectations for invoice processing are achieved.
• Coordinate weekly payment proposals with Treasury while supporting working-capital objectives and vendor relationships.
• Monitor accounts payable aging and proactively
• Serve as the primary escalation point for vendor inquiries, account statements, and payment disputes.
• Build strong relationships with key suppliers while ensuring consistent communication regarding payment status.
• Coordinate the resolution of invoice discrepancies with Procurement and operational teams.
• Oversee vendor onboarding documentation, including W-9 or W-8 forms, banking information, tax forms, certificates of insurance, and other required support.
• Prepare and complete vendor credit applications to establish or expand supplier credit terms.
• Assist in maintaining an accurate vendor master and support vendor due-diligence processes.
• Supervise, coach, mentor, and develop Accounts Payable staff.
• Establish performance expectations and monitor individual and team productivity, quality, and timeliness.
• Conduct regular performance reviews and provide ongoing feedback and coaching.
• Develop cross-training plans to ensure operational continuity and appropriate coverage.
• Promote a culture of customer service, accountability, collaboration, and continuous improvement.
• Supervise, coach, mentor, and develop Accounts Payable staff.
• Establish performance expectations and monitor individual and team productivity, quality, and timeliness.
• Conduct regular performance reviews and provide ongoing feedback and coaching.
• Develop cross-training plans to ensure operational continuity and appropriate coverage.
• Promote a culture of customer service, accountability, collaboration
• Identify opportunities to automate invoice processing, approval workflows, and exception handling.
• Support the implementation and optimization of AP automation tools, OCR technologies, and ERP workflows.
• Develop and maintain standard operating procedures, desk procedures, and process documentation.
• Ensure compliance with internal controls, segregation of duties, procurement policies, and payment authorization requirements.
• Support internal and external audit requests and remediation activities.
• Monitor key performance indicators and recommend
• Prepare and report key Accounts Payable metrics, including: Invoice processing cycle time and backlog, Percentage of invoices supported by purchase orders, Outstanding approval aging, Vendor aging, Non-PO invoice volume
• Provide regular reporting and recommendations to Finance leadership to improve operational efficiency and support decision-making.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: Associate degree