Staff Accountant

Ossium Health
San Francisco, CA


Ossium’s mission is to improve the health, vitality, and longevity of human beings through bioengineering. We develop, manufacture, and bank cell therapy products that apply the power of stem cell science to revolutionize treatment for patients with blood, immune, and orthopedic diseases. At Ossium, we empower our employees, maintain the highest standards of operational excellence, and are a force for good.

About the Job


We’re hiring a Staff Accountant to provide broad accounting support to our growing biotech startup. This role will get a view into every part of Ossium’s business as you help our Controller manage sales, account for grants, assist with reconciling and building the monthly reimbursement invoice for our government contract, process payroll, and pay our bills. You’ll also help us build reports for our board and investors and prepare for audits.

Your work will be critical in expanding our accounting function at Ossium, and you’ll get to work with members of the team across both of our locations. This is a great role for someone with a few years of accounting experience under their belt who is excited by some ambiguity and the ability to put their mark on an early stage company. This role reports to the Senior Director, Accounting (Controller).

Required Qualifications



  • Bachelor's degree in finance, accounting, mathematics, engineering, or other computationally focused field

  • 2-4 years experience in a bookkeeping or accounting position

  • Comfort with GAAP and other standard accounting practices

  • Familiar with financial software tools

  • Extremely detail oriented

  • Comfortable with ambiguity and building systems as you go

  • Excellent written and oral communication skills

  • Capability to operate with a high level of organization and excellent time management in a dynamic startup environment

  • Ability to maintain confidentiality

  • Pivot tables, sumifs, and vlook-up functional knowledge

  • This position is based in our San Francisco office; we maintain a hybrid schedule of Monday - Thursday in the office, with Friday as a remote work day

Preferred Qualifications



  • Experience with NetSuite, bill.com

  • Previous role at a start-up

  • Grant management or project based accounting experience

Key Responsibilities



  • BARDA Reimbursements: Prepare submissions for our federal government contract each month. Reconcile invoices, import wage information, and ensure accuracy of submission

  • Accounts Receivable: Ensure that customers pay AR timely and in full by tracking AR aging and diligently following up with customers by phone, email, and other methods proactively until payment is received

  • Invoice Processing: Receive, review, and enter invoices in NetSuite and Bill.com, checking for accuracy, completeness, and proper coding

  • Purchase Order Review: Perform three-way matching of purchase orders, receipts, and invoices. Follow up with stakeholders to get Purchase Orders signed and received

  • Vendor Management: Establish and maintain positive relationships with vendors, responding to inquiries, resolving payment discrepancies, and addressing any vendor-related issues

  • Expense Reports: Review and process employee expense reports, ensuring compliance with company policies

  • Month-end Closing: Maintain fixed asset and prepaid schedules. Prepare journal entries, accruals, and reconcile bank and balance sheet accounts. Collaborate with the internal teams to ensure accurate and timely financial reporting

  • Cross-Functional Collaboration: Collaborate with other departments, such as purchasing and human resources, to resolve issues, improve processes, and ensure smooth workflow and effective communication

  • Ad hoc Projects: Participate in special projects and initiatives as assigned, such as system upgrades, process automation, financial audits or financial analysis

  • Maintain accurate records, including ledgers, journals, receipts, and invoices

  • Identify gaps and areas for improvement, find solutions to increase productivity, decrease cost, and streamline timelines

We offer a full slate of employee benefits including:



  • Stock options

  • 401(k) matching

  • Medical, dental and vision coverage

  • Four weeks of PTO accrued (vacation & sick time) annually + 11 company holidays

  • Employer paid life insurance and long term disability

  • Gym membership/recreational sports reimbursements

Ossium Health provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, sex, national origin, age, disability, protected veteran status, sexual orientation, gender identity, gender expression, or any other protected characteristic. Our Equal Employment Opportunity Policy Statement and the Know Your Rights: Workplace Discrimination is Illegal Poster reaffirm this commitment. Pursuant to the San Francisco Fair Chance Ordinance, we will consider for employment qualified applicants with arrest and conviction records.

If reasonable accommodation is needed, please contact our People Team at [email protected] or 650-285-0603. Ossium Health complies with federal and state disability laws and makes reasonable accommodations for applicants and candidates with disabilities.

Principals / direct applicants only please. Recruiters, please do not contact this job poster.

Equal Opportunity Employer/Veterans/Disabled

Posted 2025-08-22

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