Senior Accountant

About Castelion

Castelion is bringing a new approach to defense development and production: one that focuses on short, iterative design cycles, rapid testing in development, and modern commercial manufacturing strategies for production at scale. We're designing, building, and testing next-generation long-range strike weapons systems to give America and its Allies a definitive edge and deter future conflicts.

Responsibilities

• Prepare journal entries, account reconciliations, variance analyses, and supporting schedules in the following areas: cash, investments, fixed assets, prepaid expenses, leases, capitalized software, debt, and other balance sheet accounts.
• Perform monthly revenue, deferred revenue, and accounts receivable reconciliations, including matching cash collections to customer invoices, reviewing contract balances for accuracy, and monitor contract modifications to ensure they are evaluated and implemented timely.
• Own key components of the monthly financial close process, ensuring timely and accurate financial reporting
• Support operational accounting activities related to accounts payable, including invoice review, payment approvals, vendor reconciliations, and resolution of invoice discrepancies.
• Support integrations between NetSuite and adjacent business systems, including procurement, expense management, and manufacturing platforms by executing data validation tasks, configuration testing, and user acceptance testing (UAT).
• Assist with technical accounting research and prepare technical workbooks for complex transactions to ensure compliance with U.S. GAAP.
• Partner closely with Supply Chain, Facilities, Engineering, and FP&A to ensure timely and accurate financial balances and improve cross-functional business processes.
• Contribute to the development of scalable accounting policies, internal controls, and operational procedures to support company growth.
• Support annual financial statement audit requests from external auditors
• Identify opportunities to automate manual processes, improve data quality, and increase the efficiency of the accounting function.

Required Qualifications

• Bachelor's degree in Accounting or Finance.
• 3+ years of public accounting experience with a nationally recognized accounting firm.
• Strong understanding of U.S. GAAP, including ASC 606 and ASC 842, and financial reporting requirements.
• Experience in month-end close activities and preparing financial reconciliations.
• Familiarity with NetSuite or a comparable ERP system.
• Advanced Microsoft Excel skills and comfort working with large datasets.
• Exceptional analytical, organizational, and communication skills.
• Ability to prioritize multiple projects and thrive in a fast-paced, evolving startup environment.

Preferred Qualifications

• CPA license or active progress toward CPA certification.
• Operational accounting experience within a high-growth technology, manufacturing, aerospace, defense, or industrial company.
• Experience with inventory accounting, cost accounting, or manufacturing environments.
• Experience supporting external audits and implementing internal controls.
• Experience improving accounting processes through automation and system enhancements.
• Comfortable working cross-functionally with technical and operational teams.

What Makes You Successful

• You take ownership and consistently deliver high-quality work with minimal oversight.
• You enjoy building processes rather than simply maintaining existing ones.
• You are naturally curious and seek to understand how the business operates beyond the numbers.
• You communicate effectively with both finance and non-finance stakeholders.
• You balance attention to detail with the ability to move quickly in an evolving environment.
• You're energized by solving problems and continuously improving the way work gets done.

All employees are granted long-term stock incentives as part of their employment as Castelion. All employees receive access to comprehensive medical, vision, and dental insurance, and the company offers four weeks of paid time off per year.

Leadership Qualities

Bias to Action and Creative Problem Solving. Desire and experience questioning assumptions in ways that lead to break through ideas that are ultimately implemented. Successfully bring in applicable processes/concepts/materials from other industries to achieve efficiency gains. Ability to personally resolve minor issues in development without requiring significant support.

High Commitment, High Initiative. A successful candidate will have a genuine passion for Castelion's mission and consistently look for ways to contribute to the company's technical goals and prevent hardware blockers. Ability to work in a fast-paced, autonomously driven, and demanding atmosphere. Strong sense of accountability and integrity.

Clear Communicator. Proactively communicates blockers. Trusted in previous roles to be voice of the company with regulators, suppliers, gatekeepers and customers. Capable of tactfully managing relationships with stakeholders to achieve company-desired outcomes without compromising relationships. Emails, IMs and verbal interactions are logical, drive clarity, and detailed enough to eliminate ambiguity.

ITAR Requirements:

• To conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State.

Employment with Castelion is governed on the basis of competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.