About Us

Cast AI is the leading Application Performance Automation (APA) platform, enabling customers to cut cloud costs, improve performance, and boost productivity – automatically.

Built originally for Kubernetes, Cast AI goes beyond cost and observability by delivering real-time, autonomous optimization across any cloud environment. The platform continuously analyzes workloads, rightsizes resources, and rebalances clusters without manual intervention, ensuring applications run faster, more reliably, and more efficiently.

Headquartered in Miami, Florida, Cast AI has employees in more than 32 countries worldwide and supports some of the world’s most innovative teams running their applications on all major cloud, hybrid, and on-premises environments. Over 2,100 companies already rely on Cast - from BMW and Akamai to Hugging Face and NielsenIQ.

What’s next? Backed by our $108M Series C, we’re doubling down on making APA the new standard for DevOps and MLOps, and everything in between.

Core values that hold us all together:

PRACTICE CUSTOMER OBSESSION. Focus on the customer journey and work backwards. Strive to deliver customer value and continuously solve customer problems. Listen to customer feedback, act, and iterate to improve customer experience.

LEAD. Take ownership and lead through action. Think and act on behalf of the entire company to build long-term value across team boundaries.

DEVELOP AND HIRE THE BEST. Strive to raise the performance bar by continuously investing in yourself, the team and by hiring the best possible candidates for every position. Drive towards personal development and professional growth, and mentor others to raise the collective bar.

EXPECT AND ADVOCATE CHANGE. Strive to innovate and accept the inevitable change that comes with innovation. Constantly welcome new ideas and opinions. Share insights responsibly with unwavering openness, honesty, and respect. Once a path is chosen, be ready to disagree and commit to a direction.

Role overview

We’re a hypergrowth SaaS company looking for a detail-oriented and motivated Billing Specialist to help ensure our global invoicing operations run smoothly. This is an early-career role, ideal for someone with 2–3 years of hands-on billing or AR experience who is eager to learn and grow within a scaling Finance team.

In this role, you’ll collaborate closely with our Finance, Sales, Customer Success, and Legal teams to support accurate customer invoicing, contract updates, marketplace billing, and day-to-day finance operations.

Key Responsibilities

• Prepare and issue timely, accurate invoices based on customer contracts and usage data
• Assist with billing and reconciliation for sales through third-party marketplaces (e.g., AWS, Azure, GCP)
• Maintain and update billing records for new contracts, renewals, upgrades, and downgrades
• Respond to billing inquiries from Sales, TAMs, and customers, ensuring resolution within SLA
• Support monthly close processes, including billing cut-off and revenue reconciliation
• Follow up with customers on overdue accounts and assist with collections
• Perform administrative tasks such as account setup, vendor forms, and audit support
• Participate in process improvements and help test billing system enhancements

Requirements

• Based on the US East Coast
• Able to collaborate effectively across EU and US time zones
• 2–3 years of experience in billing, accounts receivable, or order management - SaaS experience a plus
• Familiarity with billing systems and marketplaces is preferred
• Advanced Excel / Google Sheets skills (vLookups, Pivot tables)
• Strong attention to detail and a customer-first mindset
• Experience with SaaS metrics (ARR, MRR)
• Exposure to CRM systems like Salesforce
• Basic understanding of revenue recognition principles

What's in it for you?

• Team of highly skilled professionals to work with and learn from

• Impact and visibility. Our organization is flat, getting in touch with CEO or CTO is a common practice here

• Flexible working hours. We deliver instead of sitting in the office 8 to 5

• Skin in the game. Every employee gets a share of the company

• 10% time to focus on self-improvement or personal projects.