Senior Accounting Manager

<div class="content-intro"><h2><strong>A Rare Opportunity to Shape the Future of Genomics</strong></h2> <p>Join a team of brilliant, passionate innovators determined to transform healthcare. At BillionToOne, we've built a category-defining, publicly traded company on Nasdaq where transparency fuels trust, collaboration drives breakthroughs, and every contribution moves the needle on our mission to make life-changing diagnostics accessible to all. We don't just aim for incremental improvements; we build products that are 10x better than anything that exists today.</p> <p>Our scientists, engineers, sales executives, and visionaries are united by an unwavering commitment to changing the standard of care in prenatal and cancer diagnostics. This is where cutting-edge science meets human compassion, and every innovation you contribute helps remove the fear of the unknown from some of life's most critical medical moments.</p> <p>If you're driven by purpose, energized by innovation, and ready to help shape the future of precision medicine at scale, this is where you belong.</p></div><p>The <strong>Senior Accounting Manager</strong> will oversee the accounting operations of a newly public company in its first full year of SOX 404(b) compliance, including managing the month-end close process, owning the integrity of the general ledger, and serving as a named control owner within our SOX framework. Reporting to the Director of Accounting, this role leads a team of GL and AP accountants, acts as a primary day-to-day contact for our external auditors, and is accountable for the monthly management reporting package including flux analysis and cost-per-test economics. The ideal candidate has experience in a fast-paced, post-IPO environment and brings the experience and knowledge to drive operational and process improvements.</p> <p><strong>Responsibilities:</strong></p> <ul> <li><strong>Month-End Close: </strong>Manage the month-end and quarter-end close on a dependency-gated calendar in FloQast, including the journal entry control log, reconciliation sign-offs, and close checklist completion driving continuous compression of the close timeline while raising quality and audit-readiness.</li> <li><strong>General Ledger Oversight: </strong>Own the accuracy and integrity of the general ledger in NetSuite, including review of recurring and non-standard journal entries, balance sheet reconciliations across the full account population, and root-cause resolution of posting and configuration issues.</li> <li><strong>Internal Controls (SOX 404(b)): </strong>Serve as a named owner and reviewer for financial reporting, GL, and close-cycle controls. Maintain control narratives and supporting documentation, ensure IPE (information produced by the entity) meets completeness and accuracy standards, and remediate deficiencies with urgency. Coordinate submission of deliverables with key business partners.</li> <li><strong>Audit & Compliance: </strong>Act as a day-to-day point of contact for our Big 4 external auditor and consulting advisors, managing PBC requests, walkthrough support, sample pulls, and interim and year-end fieldwork.</li> <li><strong>Financial Reporting & Flux Analysis: </strong>Own the monthly management reporting package: month-over-month flux analysis by functional area (COGS, R&D, S&M, G&A), cost-per-test analytics for the prenatal and oncology products, and a management summary suitable for the CFO and leadership team.</li> <li><strong>Team Leadership: </strong>Lead, mentor, and develop a team of GL and AP accountants spanning general ledger, fixed assets, accounts payable, and payroll, setting clear expectations, building review discipline into