Staff Software Engineer – Billing & Metering

About IonQ: IonQ, Inc . [NYSE: IONQ] is the world’s leading quantum platform and merchant supplier - delivering integrated quantum solutions across computing, networking, sensing, and security. IonQ’s newest generation of quantum computers, the IonQ Tempo, is the latest in a line of cutting-edge systems that have been helping customers and partners including Amazon Web Services, and AstraZeneca achieve 20x performance results and accelerate innovation in drug discovery, materials science, financial modeling, logistics, cybersecurity, and defense. In 2025, the company achieved 99.99% two-qubit gate fidelity, setting a world record in quantum computing performance . Headquartered in College Park, Maryland, IonQ has operations in California, Colorado, Massachusetts, Tennessee, Washington, Italy, South Korea, Sweden, Switzerland, Canada, and the United Kingdom. Our quantum computing services are available through all major cloud providers, while we also meet the needs of networking and sensing customers across land, sea, air, and space. IonQ is making quantum platforms more accessible and impactful than ever before. We don’t just build the world’s best quantum computers—we sell them! We make our systems available via the cloud, alongside quantum services to do the heavy lifting for our customers. We are looking for a Staff Software Engineer to lead our billing and payments platform integration efforts, which makes it possible for us to meter and sell our products to customers. You’ll lead key components of the platform in collaboration with our product team and other engineers, to build the best quantum developer experience for our customers and partners. Responsibilities : Design and implement end-to-end usage-based billing capabilities, utilizing pricing primitives, payment flows, usage tracking, contract and entitlement models, and revenue data pipelines. Know where to extend third-party billing platform integrations and where to build our own primitives around them. Collaborate with Product and Customer Success teams to translate ambiguous business needs into scalable technical solutions for our next-generation billing system, including expansion into new international markets and supporting Enterprise resellers. Own the interfaces with third-party billing platforms like Metronome and Stripe as well as our internal dataset for generating invoices and revenue reports. Perform required manual work like Enterprise contract amendments, pricing config changes, and billing support escalations. A lot of it can be automated by building internal tooling, but some of it still requires human-in-the-loop. Partner with Finance, Legal, and other stakeholders on compliance-related technical decisions. You’d be a good fit with: Deep understanding of how to build for correctness and have an instinct for where idempotency, reconciliation, retry logic, and audit trails matter in a billing system Past experience with building usage-based billing, subscription, and invoice services Proven experience designing and leading large-scale, cross-team technical projects from inception to completion Exceptional written and verbal communication skills, demonstrated through a portfolio of technical design documents, architectural diagrams, or public presentations A strong sense of ownership and the ability to navigate ambiguity to drive complex projects forward with a high degree of autonomy Familiarity with using AI in day-to-day coding Bachelor's degree in Computer Science, Engineering or a related field, or equivalent training, fellowship, or work experience 8+ years of professional software engineering experience shipping backend or platform systems in production and 3+ years leading large-scale, complex projects as a tech lead You’d be a great fit with: Experience with the operational side of B2B billing or B2C billing Familiarity with global payment systems, including international tax regulations (VAT, GST), currency conversion, and local payment met