Software Engineer - Billing & Metering

Position: 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:

* Architectural Vision & Strategy:
Architect and lead the design and building of our next-generation billing and payments platform. Author technical design documents, RFCs, and roadmaps that align with long-term business goals

* Technical Authority & Mentorship:
Act as the ultimate technical authority for the billing domain. Provide guidance, mentorship, and technical oversight to senior engineers and team leads across the organization. Elevate the entire engineering team through best practices and knowledge sharing

* Solve Complex Problems:
Spearhead the development of solutions for our most challenging technical problems, such as implementing sophisticated usage-based billing models or expanding into new international markets with complex tax and compliance needs

* Strategic Cross-Functional Influence:
Collaborate with senior leadership in Product, Finance, and Legal to influence product strategy and ensure our technical architecture can support future business initiatives. Translate complex business needs into a scalable and maintainable technical reality

* Hands-On Development:
While this is a strategic role, you are expected to remain hands-on by leading the development of new solutions, contributing to critical path code, and performing deep-dive investigations into production issues

You'd be a good fit with:

* 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, with a history of technical leadership and shipping large-scale, mission-critical systems

* Deep, expert-level knowledge (4+ years) of payment processing platforms, with extensive hands-on experience with the Stripe API for SaaS and/or Marketplace use cases (Stripe Billing, Connect, Invoicing, etc.)

* Strong understanding of transaction life cycles, payment processing flows, and idempotency in distributed systems

* Past experience with usage-based billing and invoice reconciliation

* Solid understanding of microservices architecture, event-driven systems, and data consistency patterns

* 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

* Expertise programming backends in Go or Java Script

* 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

You'd be a great fit with:

* 10+ years of software developer experience

* Experience with global payment systems, including international tax regulations (VAT, GST), currency conversion, and local payment methods

* Deep understanding of financial compliance (PCI DSS) and revenue recognition principles

* Past experience with subscription billing systems, usage-based billing, and invoice reconciliation

* Past experience integrating fraud detection systems

* Familiarity with usage-based billing platforms like Metronome

* Active participation in the broader tech community (e.g., open-source contributions, conference talks)

Location:

This role will work onsite or hybrid at our office located in…