Accounts Receivable Specialist

At Vast, our mission is to contribute to a future where billions of people are living and thriving in space. We are building artificial gravity space stations, allowing long‑term stays in space without the adverse effects of zero‑gravity. Our initial crewed space habitat will be Haven‑1, scheduled to be the world’s first commercial space station when it launches into low‑Earth orbit in 2026.

It is part of our stepping stone approach to continuous human presence in LEO. Our team is all‑in, committed to executing our mission safely and on time. If you want to work with the most talented people on Earth furthering space exploration for humanity, come join us.

Vast is looking for a Accounts Receivable Specialist
, reporting to the Director of Finance
, to support the development of the systems that will be required for the design and build of artificial‑gravity human‑rated space stations.

In this role, you will manage billing, collections, customer account reconciliation, and AR process improvements that ensure timely cash flow and accurate revenue reporting. This is a key opportunity to help shape scalable financial systems in a fast‑paced, early‑stage environment.

This will be a full‑time
, non‑exempt position located in our Long Beach location.

• Prepare and process customer invoices in compliance with contract terms
• Monitor AR aging reports, proactively follow up on past‑due accounts, and reduce DSO
• Manage customer onboarding including credit terms, tax documentation, and billing setup
• Reconcile customer accounts, investigate discrepancies, and process credit memos or adjustments
• Partner with Sales, Contracts, and Program Management to ensure accurate billing and revenue capture
• Post payments (ACH, wire, check, credit card) and ensure proper application to customer accounts
• Maintain an organized electronic repository of contracts, billing schedules, and supporting documentation
• Support month‑end close activities including AR reporting, revenue accruals, and account reconciliations
• Assist with automation and process improvements to strengthen AR performance and cash collections
• Respond promptly and professionally to internal and external billing inquiries
• Assist the Finance team with other ad‑hoc projects as needed

• Bachelor’s degree in Accounting, Finance, or Business Administration preferred
• 2–5 years of Accounts Receivable experience
• Strong understanding of revenue recognition, invoicing, and collections best practices
• Proficient with Google Suite (Sheets, Docs, Slides)
• Clear and professional communication skills (written and verbal)
• Ability to handle sensitive financial information with discretion

• Experience in manufacturing or aerospace environments a plus
• Familiarity with Net Suite, Ramp, or similar AR/ERP systems
• Strong understanding of project‑based or government contract billing (T&M, FP, Milestone)
• Excel/Sheets proficiency with formulas, pivot tables, and data analysis
• Ability to thrive in a high‑growth startup, managing shifting priorities and deadlines
• Analytical, resourceful, and solutions‑focused approach to problem solving

• Ability to travel up to 50% of the time
• Willingness to work overtime, or weekends to support critical mission milestones

• AR Specialist I: $23.55 - $36.06
• AR Specialist II: $28.61 - $43.27

Salary Range:
California $23.55 — $43.27 USD

Base salary will vary depending on job‑related knowledge, education, skills, experience, business needs, and market demand. Salary is just one component of our comprehensive compensation package. Full‑time employees also receive company equity, as well as access to a full suite of compelling benefits and perks, including: 100% medical, dental, and vision coverage for employees and dependents, flexible paid time off for exempt staff and up to 10 days of vacation for non‑exempt staff, paid parental leave, short and long‑term disability insurance, life insurance, access to a 401(k) retirement plan, One Medical membership, Class Pass credits, personalized mental healthcare through Spring Health, and other discounts and perks.

We also take…