Senior Accountant

Overview

About Adaptive

Adaptive is a cybersecurity startup on a mission to stop AI-powered cyberattacks. In December 2025, the company announced an $81M Series B led by NVIDIA and Bain Capital Ventures, with participation from Capital One Ventures, Citi Ventures, and continued support from Andreessen Horowitz (a16z), the OpenAI Startup Fund, and Abstract Ventures. The round marked NVIDIA’s first AI cybersecurity investment.

Adaptive was founded by Brian Long and Andrew Jones, repeat entrepreneurs who have built and scaled category-defining companies. Brian and Andrew previously co-founded Attentive, which grew to more than $500M in annual revenue and a $10B+ valuation, and Tap Commerce, which was acquired by Twitter. Together, they bring deep experience building high-growth, product-led businesses at massive scale as Adaptive builds the security layer for the AI era.

Trusted by leading banks, technology companies, and healthcare organizations, Adaptive protects teams from emerging threats like deepfakes, smishing, and AI-powered voice scams. With rapid enterprise adoption and a $200B+ market ahead, the company is just getting started.

We’re hiring a full-time Senior Accountant based in our Los Angeles or NYC offices to support day-to-day accounting operations and month-end close. This is a hands-on role in a lean, fast-moving accounting team where you’ll own core workflows end-to-end. On a daily basis, you will lead our accounts receivable and accounts payable operations. During close, you’ll support general ledger reconciliations and help keep our financials accurate, audit-ready, and on schedule.

You’ll also contribute to ad-hoc audit and tax projects as we scale.

This role reports directly to the Head of Accounting & Finance.

• Accounts Receivable (AR)
  • Own accounts receivable operations end-to-end, including:
  • Responding to customer questions regarding contracts, invoicing, and payments
  • Issuing and sending invoices on time and with accurate support
  • Recording and applying customer payments from our operating accounts
  • Following up on past-due invoices, resolving discrepancies, and keeping AR aging current
• Accounts Payable (AP)
  • Own accounts payable operations end-to-end, including:
  • Reviewing and ensuring Ramp credit card transactions are coded correctly
  • Following up with employees to maintain receipt and policy compliance
  • Supporting vendor onboarding and documentation, including W-9 collection for 1099 filings
  • Keeping AP aging accurate and up to date
• Month-End & Year-End Close
  • Support month-end, quarter-end, and year-end close with accuracy and urgency.
  • Prepare and post routine journal entries (accruals, prepaid amortization, reclasses).
  • Perform balance sheet reconciliations, including:
  • Bank and credit card reconciliations
  • Prepaids and fixed assets
  • Commissions calculations and payouts
  • Sales tax payable
  • Review and clean up AR/AP aging, investigate variances, and drive issues to resolution.
  • Maintain close documentation and supporting schedules for audit readiness.
• Audit & Tax Support
  • Assist with external audits and tax compliance by preparing schedules and responding to requests.
  • Support recurring compliance filings (e.g., 1099s, 3921s) and related documentation.
• Projects & Process Improvement
  • Identify opportunities to streamline AR/AP and close processes as we scale.
  • Participate in accounting system improvements and future implementations.
  • Collaborate cross-functionally (Sales, CS, HR, Ops) to ensure clean inputs and accurate reporting.

• Bachelor’s degree in Accounting, Finance, or a related field.
• 2–4+ years of relevant accounting experience (startup, SaaS, or public accounting a plus).
• Working knowledge of GAAP and core accounting principles.
• Hands-on experience supporting month-end close and balance sheet reconciliations.
• Experience owning or meaningfully supporting AR and/or AP processes.
• Strong Excel/Google Sheets skills (pivot tables, XLOOKUP/VLOOKUP, formulas).
• Familiarity with an ERP/GL system (e.g., Net Suite, Quick Books, Oracle, SAP) and modern finance tools (e.g., Ramp, Stripe, or similar).

• High attention to detail and a strong sense of ownership.
• Organized, deadline-driven, and comfortable juggling multiple priorities.
• Clear communicator who’s confident working with customers and internal teams to resolve issues.
• Improvement-minded—always looking for a better, cleaner way to run the process.