Senior Accountant

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 hiring a Senior Accountant to support the accounting operations that ensure accuracy, transparency, and reliability across Mariana’s growing portfolio of assets and operating entities.

This is a hands-on role focused on executing core accounting processes and supporting the monthly close, reconciliations, and financial reporting. You will work closely with the Accounting Manager, FP&A team, and operational leaders to ensure financial activity is properly recorded and reflected in company reporting.

As Mariana continues to scale, this role will also contribute to improving accounting workflows, strengthening internal controls, and helping implement systems that support efficient and reliable financial operations.

This role is ideal for someone who enjoys detailed work, solving accounting challenges, and building efficient processes in a fast-moving environment.

• Support the monthly, quarterly, and annual close process

• Prepare journal entries, accruals, and account reconciliations

• Maintain general ledger accuracy across multiple entities

• Assist with preparation of 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

• Assist with external audits, tax filings, and compliance requirements

• Identify opportunities to improve accounting processes and automation

• 3–6 years of experience in accounting, public accounting, or a related role

• Strong understanding of GAAP and core accounting principles

• Experience supporting month-end close processes

• Public accounting background preferred

• Experience working 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 businesses is a plus

• Willingness to be in the office most days and work closely with operational teams

At Mariana Minerals, you’ll be part of a mission-driven team reshaping the way critical minerals are sourced and supplied globally. You’ll have the autonomy to make big decisions, the tools to innovate, and a culture that values ownership, smart automation, and collaboration.

Extreme Ownership – We take full responsibility for outcomes, relentlessly driving toward solutions.

Engineer Out Requirements, then Automate – We simplify, optimize, and then automate for scale.

Share Your Legos – We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.

Join us as we build the future of responsible mineral sourcing and supply.

Mariana is an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. We do not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other protected status.