Senior Accountant

About Mariana Minerals

Mariana Minerals is a software-first, vertically integrated minerals company dedicated to supplying critical minerals essential for modern energy, AI, and defense technologies. We aim to reimagine the minerals supply chain through a blend of deep industry expertise, advanced software, automation, and data-driven decision-making.

The Role

We are seeking a Senior Accountant to join our team. This role supports the accounting operations necessary for ensuring accuracy, transparency, and reliability across Mariana’s expanding portfolio of assets and operating entities. The Senior Accountant will focus on executing core accounting processes, including the monthly close, reconciliations, and financial reporting. They will work closely with the Accounting Manager, FP&A team, and operational leaders to ensure financial activities are accurately recorded and reflected in company reporting. As Mariana scales, this role will also contribute to improving accounting workflows, strengthening internal controls, and implementing systems that support efficient and reliable financial operations. Ideal candidates enjoy detailed work, solve accounting challenges, and build efficient processes in a dynamic environment.

What You’ll Do

• Support the monthly, quarterly, and annual close process
• Prepare journal entries, accruals, and account reconciliations
• Maintain general ledger accuracy across multiple entities
• Aid in preparing financial statements and supporting schedules
• Track and record expenses, and operational transactions
• Partner with FP&A to ensure accurate budget vs. actual reporting
• Investigate and resolve accounting discrepancies and variances
• Support implementation and documentation of accounting policies and procedures
• Aid with external audits, tax filings, and compliance requirements
• Identify opportunities to improve accounting processes and automation

Desired Qualifications

• 3–6 years of experience in accounting, public accounting, or a related field
• Strong understanding of GAAP and core accounting principles
• Experience supporting month-end close processes
• Public accounting background preferred
• Experience with ERP or accounting systems
• Strong attention to detail and organizational skills
• Ability to manage multiple priorities in a fast-paced environment
• Strong communication skills and ability to work cross-functionally
• Background in natural resources, energy, infrastructure, or other capital-intensive industries (plus)
• Willingness to be in the office most days and work closely with operational teams