Senior Full Stack Software Engineer - Application Engineering

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. Location: This role is based out of our College Park, MD, Boulder, CO, Bothell, WA, or Ontario, Canada offices. We offer a hybrid work model, allowing for remote work two days per week. Travel: Up to 5% Job ID: 1781 The Role: We are looking for a Senior Full Stack Software Engineer for Application Engineering . As a Software Engineer on the Applications Engineer team, you'll be part of a cross-functional team whose mission is to deliver real-world applications and deliver value from the jump forward in computing that quantum solving represents. We don't just build the world's best quantum computers - we apply cutting-edge quantum tools to real-world problems. Until this year, our team for Applications Research has been building prototypes and doing research, by working closely with our customers. Our new department, Applications Engineering, transforms those prototypes and research into applications for broad use. Our work makes those innovations available to more people and businesses; as libraries, as APIs, and ultimately as whole SaaS applications. Our Application Engineering team has a commitment to engaging user experience and showing quantum advantage, not just talking about it. We are especially focused on clearly communicating the value of hybrid computing, and making clear outputs to visualize domain specific problems. It’s a chance to shape how quantum computing is conceptualized in contrast to classical computing To support that goal and lay the groundwork for future quantum-enhanced services, this role will also help polish our internal tools, APIs, and integrations. Along with humans, other digital tools and systems will need to easily read and parse the solutions we generate. That means designing APIs and library interfaces, often in domain specific terms or formats, to speak to experts in tools and systems they already know deeply. You will be a key contributor in taking novel quantum approaches to cutting-edge problems, and turning them into clear concise tools. You will help shape how everyday developers visualize and use quantum computing to solve problems, in close collaboration with Developer Tools, Infrastructure, and Product teams. The ideal candidate will be excited about working on a chemistry simplification via Quantum Computing tool one month, and working on visualizing novel topology solver the next. Responsibilities : Creating simple and clear interfaces in cooperation with domain experts. We bridge quantum computing to specific domain, by creating clear API interfaces in the language and visuals domain experts are experts in. Designing the API endpoints and intuitive software library interfaces, making applications and tools easy to maintain and update Working closely with peers in Applications, Developer Tools, and Field Engineering teams to share best practices and give feedback on inter…