Note: The job is a remote job and is open to candidates in USA. Mainstay is an AI-native market intelligence platform for the single-family rental industry. The company is hiring an Accounting Operations Associate to support finance and accounting operations, including AP, AR, treasury, financial systems, month-end close, reporting, payroll, and expense management.
Responsibilities
- Own the full AP cycle: process vendor invoices, verify coding and approvals, manage payment runs, and maintain vendor terms
- Own the full AR cycle: generate and send customer invoices, track collections, manage past-due follow-up, and apply cash receipts
- Maintain accurate AP/AR aging schedules; proactively flag risk and resolve discrepancies with vendors and customers
- Track and report on AP/AR KPIs (e.g., DPO, DSO, aging trends) and use them to drive process improvement
- Own vendor onboarding, W-9/W-8 collection, and vendor record maintenance
- Serve as the go-to point of contact for all AP/AR questions from vendors, customers, and internal teams
- Monitor daily cash positions across Mainstay's bank and operating accounts
- Process and execute wire transfers, ACH payments, and other cash movements in line with internal controls and approval limits
- Manage day-to-day banking relationships and administer online banking platforms — user access, permissions, and alerts
- Support short-term cash flow forecasting and proactively flag liquidity needs to the Controller
- Reconcile treasury and bank accounts, and investigate/resolve discrepancies
- Act as the primary owner/administrator of Mainstay's accounting, AP/AR, and treasury/banking platforms (e.g., ERP, [Bill.com](http://Bill.com), banking portals) — user access, configuration, and troubleshooting
- Manage integrations across systems (AP/AR, banking, general ledger, payroll), ensuring data flows cleanly and stays reconciled
- Own system maintenance: software updates, permissions audits, and ongoing troubleshooting across the financial systems stack
- Evaluate, recommend, and help implement new or upgraded financial systems and automation as the company scales
- Build and maintain documentation/SOPs for financial systems and workflows
- Prepare journal entries and support the monthly close checklist
- Reconcile bank and credit card accounts, and research/clear variances
- Maintain supporting schedules for prepaids, accruals, and other balance sheet accounts
- Assist in preparing monthly financial reports and management summaries
- Support budget-to-actual tracking and basic variance analysis
- Pull and organize data for ad hoc financial requests
- Support payroll processing in partnership with the Controller/HR
- Review and process employee expense reports and reimbursements
- Help maintain compliance with expense policy and documentation standards
Skills
- 1–3 years of experience in accounting, bookkeeping, or a related finance role, with meaningful hands-on AP/AR experience
- Exposure to treasury or cash management tasks (bank transfers, cash positioning, reconciliations) — direct treasury experience is a strong plus, not a requirement
- Experience administering or power-using financial systems (e.g., an ERP, AP/AR platform, or banking portal) — comfortable owning a system, not just using it
- Strong Excel/spreadsheet skills and comfort working across multiple financial systems
- Strong attention to detail and follow-through on recurring, deadline-driven, controls-sensitive work
- Clear communicator, comfortable working with vendors, customers, banks, and internal teams
- A systems/process mindset — someone who naturally looks for ways to make financial operations more accurate and efficient
- Interest in growing beyond AP/AR into broader accounting, treasury, and finance operations
- Experience at a startup or fast-growing company
- Prior exposure to treasury management systems or online banking platforms
- Prior experience owning/administering a financial system beyond AP/AR (e.g., ERP, payroll, or expense tools)
- Familiarity with payroll systems and expense management tools
- No certification required; degree in accounting, finance, or related field preferred but not mandatory
Benefits
- Remote work
Company Overview