Senior Accountant Torrance, CA Operations

Castelion Corporation; Torrance (CA); Hybrid; USD 85,000 - 110,000; Full time

Job summary

Castelion is seeking a Senior Accountant in Torrance, CA to join a fast-growing defense technology startup. You will own core accounting functions, including the monthly close, reconciliations, and cross-functional collaboration with operations and FP&A teams.

Ideal candidates will have 3+ years of public accounting, strong U.S. GAAP knowledge (ASC 606/842), and proficiency with NetSuite and Excel. This role offers impactful ownership in a high-growth environment.

Qualifications

• Bachelor's degree in Accounting or Finance required.
• 3+ years public accounting experience with a nationally recognized firm.
• Strong U.S. GAAP knowledge including ASC 606 and ASC 842.
• Experience with month-end close and reconciliations.
• Familiarity with NetSuite ERP.
• Advanced Excel and data analysis skills.
• Excellent analytical, organizational, and communication abilities.
• Ability to prioritize multiple projects in a fast-paced startup environment.

Responsibilities

• Prepare journal entries, reconciliations, variance analyses, and schedules.
• Perform monthly revenue and accounts receivable reconciliations.
• Own components of the monthly close and financial reporting.
• Support AP activities including invoice review and vendor reconciliations.
• Assist with integrations between NetSuite and other systems.
• Prepare technical workbooks for complex transactions under US GAAP.
• Collaborate with Supply Chain, Facilities, Eng, and FP&A.
• Help develop scalable accounting policies and internal controls.
• Support annual external audits.
• Identify opportunities to automate processes and improve data quality.

Skills

U.S. GAAP

NetSuite

Excel

Month-end close

Financial analysis

Communication skills

Prioritization

Startup experience

Education

Bachelor's degree in Accounting or Finance

Tools

NetSuite ERP

MS Excel

Job description

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus, ownership, and excellence are decisive advantages - and we're building a world-class team to turn bold ideas into real capability.

This is a rare opportunity to join at an early stage, where you'll have significant ownership, collaborate with exceptional teammates, and make a direct, measurable impact on our mission and the future of the company - regardless of your function.

Senior Accountant

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.
• [Skills and experiences]

Castelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details.

Other Duties

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice.

Additional Eligibility Requirements

This position may require access to classified information or restricted U.S. Government sites, systems, or information, as determined by the Company and/or applicable U.S. Government requirements. If the position is so designated, your employment in the role may be contingent upon your ability to obtain and maintain the required U.S. Government security clearance or other government authorization, and to satisfy any citizenship or other eligibility requirements imposed by applicable law, regulation, executive order, or government contract requirements. You will be notified if and when such requirements apply.

Affirmative Action/EEO Statement

Castelion is an Equal Opportunity Employer. We are committed to providing equal employment opportunities to all applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information, protected veteran status, or any other characteristic protected by applicable federal, state, or local law.

Castelion is committed to providing reasonable accommodations to qualified individuals with disabilities throughout the application and hiring process. If you require a reasonable accommodation to complete an application, participate in the interview process, or otherwise participate in the hiring process, please contact [e-mail]. Requests for accommodation will be considered on an individual basis and handled in accordance with applicable law.

Castelion is committed to fostering a workplace where employment decisions are based on qualifications, business needs, and the ability to perform the essential functions of the role, with or without reasonable accommodation.

This position requires access to export-controlled information, and as such, employment (or hiring of a contractor) is contingent upon the candidate’s ability to access all applicable export-controlled information without additional export licensing being required by the Bureau of Industry and Security and/or the Directorate of Defense Trade Controls.