AP/AR Specialist

AP/AR Specialist

Location: Mountain View, CA (Hybrid)

Rune connects wasted power to the compute that needs it. Solar plants generate electricity the grid can't take: clipped by inverters, curtailed by operators, gone before it ever reaches a meter. Meanwhile, AI needs more power than new construction can deliver in time.

Rune deploys hardware, software, and financial solutions to put this power to work. We build modular micro data centers that install directly at solar sites, bypassing the traditional grid entirely and turning stranded power into compute. We're backed by Spark Capital, Union Square Ventures, and Lowercarbon Capital.

The Role:

Rune is seeking an AP/AR Specialist to join our team in Mountain View. This is a hands-on, detail-intensive role in Rune's accounting function, responsible for accurate vendor payments and contract-driven customer invoicing across a rapidly growing organization. Your work keeps Rune's cash position trustworthy and enables us to scale manufacturing, operations, and deployments with confidence. You will partner daily with supply chain, site operations, and our commercial team, and every one of those functions will rely on the accuracy of the records you keep.

Key Responsibilities:

Accounts Payable

• Own the full AP cycle: vendor onboarding (W-9s and banking verification), invoice intake and GL coding, PO and receiving matching, approval routing, and payment runs via ACH, wire, and check.
• Process high-dollar hardware and equipment invoices for servers, networking, electrical and HVAC components, matching against POs, BOMs, and receiving records, and resolving discrepancies before payment goes out.
• Manage payments to site landlords, contractors, and equipment lessors, including milestone-based construction payments and monthly pass-through charges that must tie to the underlying agreements.
• Administer our corporate card and spend program (we use Ramp): receipt compliance, coding, and monthly statement close.
• Enforce payment fraud controls: callback verification for new or changed banking details, dual approval on wires, and disciplined vendor master hygiene.
• Own W-9 collection and annual 1099 filings.

Accounts Receivable

• Own customer invoicing end to end: read our commercial agreements and translate payment terms, prepayment drawdowns, usage charges, and escalators into accurate, on-time invoices.
• Calculate and apply service credits per contract mechanics, coordinating with engineering and operations on the underlying uptime and availability data.
• Track customer prepayments and deposits, ensuring drawdowns, true-ups, and refunds match contract terms.
• Run collections and the AR aging: reminders, escalation paths, and clean cash application against open invoices and prepayment balances.
• Prepare billing schedules and support the Controller on revenue recognition workpapers.

Ideal Qualifications:

• You have owned full-cycle AP and AR hands-on, ideally as an early finance hire at a startup.
• Comfort reading commercial contracts and translating payment terms, credits, and milestones into billing and payment actions.
• Fluency in a modern accounting stack: an ERP or GL system (QuickBooks, NetSuite, or similar) plus spend management tools; direct experience with Ramp is a plus.
• Strong Excel skills: lookups, pivot tables, and reconciliations at a minimum.
• Bias to build: you've created or materially improved AP/AR processes rather than inheriting them.

What We Offer: Competitive base and strategic ownership in what we believe will be one of the largest infrastructure build-outs of the decade.

Rune is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.