Senior Accountant

About Alta Advisors

Alta Advisors is a San Francisco-based strategic finance and accounting firm serving frontier technology startups. We partner with founders building technically complex, capital-intensive companies, providing fractional CFO leadership, capital raising, and operational finance. We've helped clients raise over $500M and support companies representing more than $2B in enterprise value, backed by leading venture capital firms.

We're looking for an experienced Senior Accountant based in Mexico to independently manage accounting and monthly closes for multiple U.S. clients. You'll own financial accuracy, reporting, and process improvement while working directly with clients and Alta's Accounting Manager.

What You'll Do

Own the monthly close

• Manage monthly, quarterly, and year-end closes for multiple U.S. clients.

• Prepare journal entries, accruals, prepaids, and bank, credit card, and balance sheet reconciliations.

• Deliver accurate, complete financial statements on schedule.

Manage accounting operations

• Process accounts payable, expenses, and payroll using QuickBooks Online and related platforms.

• Prepare workpapers for revenue recognition, COGS, payroll allocations, and accruals.

• Resolve discrepancies across accounting, billing, payroll, and expense systems.

Deliver financial reporting

• Prepare financial statements in accordance with applicable U.S. accounting standards, along with budget-versus-actual and KPI reports.

• Explain material variances and unusual transactions.

• Coordinate directly with clients to resolve questions and obtain missing information.

Improve how we work

• Standardize and document accounting workflows, close checklists, and processes across clients.

• Use technology, AI, and automation to improve efficiency without sacrificing accuracy.

AI Proficiency — Required

Demonstrated experience using AI tools to improve professional workflows, productivity, or decision-making. You should proactively identify opportunities to use AI, integrate it into your work, and critically review outputs for accuracy and responsible use.

What Success Looks Like

• Reliable monthly close: Independently manage multiple U.S. clients and consistently meet deadlines.

• Accurate financials: Deliver complete, review-ready reconciliations, workpapers, and financial reports with minimal corrections.

• Strong client collaboration: Communicate clearly, resolve issues proactively, and keep deliverables on track.

• Continuous improvement: Use AI, automation, and better processes to improve accounting quality, efficiency, and scalability.

What We're Looking For

Required qualifications

• 5+ years of accounting experience, including hands-on ownership of the full monthly close.

• Experience managing accounting for multiple companies or clients simultaneously.

• 2+ years of hands-on QuickBooks Online experience.

• Experience with AP or expense management and payroll platforms.

• Working knowledge of U.S. GAAP or IFRS, including revenue recognition, accruals, fixed assets, and cost allocations.

• Advanced Excel and Google Sheets skills.

• Professional written and spoken English for direct communication with U.S. clients.

• Strong organization, independence, and ownership of deadlines and deliverables.

Preferred qualifications

• Experience with venture-backed startups or technology companies.

• Familiarity with Bill.com, Brex, Ramp, Gusto, or Rippling.

• U.S. CPA, Mexican Contador Público Certificado, ACCA, or equivalent certification.

Engagement Details

• Location: Remote, based in Mexico.

• Engagement: Full-time independent contractor under Alta Advisors' contractor agreement.

• Availability: Mutually agreed window during U.S. Pacific Time business hours for client and team collaboration.

• Primary contact: Accounting Manager.

• Compensation: Monthly fee in USD, paid against invoices. Please share your expected monthly rate.

• Invoicing: Contractors manage their own applicable taxes and monthly invoices.

Interviews are recorded with prior notice.

Alta Advisors considers all qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, marital status, pregnancy, or any other characteristic protected by law.