ABOUT THE COMPANY Infleqtion is a global quantum technology company solving the world’s most challenging problems. The company harnesses quantum mechanics to build and integrate quantum computers, sensors, and networks. From fundamental physics to leading edge commercial products, Infleqtion enables “quantum everywhere” through our ecosystem of devices and platforms. Our mission is to commercialise atom-based quantum products that provide orders of magnitude improvements in performance and computing applications. LOCATION Infleqtion has offices in the USA, United Kingdom and Australia. This is a full-time position in our Kidlington and Harwell offices. Our flexible working policy enables all full-time employees to work up to 2 days a week from home as work permits. POSITION SUMMARY Infleqtion is seeking a Quantum Software Engineer to develop cutting-edge applications and algorithms for next-generation quantum computers. In this role, you will design, implement, and optimize quantum algorithms across domains such as simulation, optimization, sensing-enhanced workflows, and hybrid quantum-classical computation. You will work closely with hardware, control, and research teams to translate theoretical advances into performant, executable workloads, leveraging modern quantum SDKs, compiler toolchains, and resource estimation frameworks. The ideal candidate combines strong foundations in quantum algorithms and computational mathematics with practical software engineering expertise, enabling them to build scalable, testable, and high-impact quantum applications that push the boundaries of near-term and fault-tolerant quantum systems. JOB RESPONSIBILITIES The duties and responsibilities outlined below include essential functions of the role. Depending on business needs, this role may perform a combination of some or all of the following duties. Duties, responsibilities, and activities may change, or new ones may be assigned at any time. Conduct R Demonstrated ability to work and communicate with all levels of an organization; Professional-level communication skills, including verbal, written, and presentation skills Demonstrated ability to work comfortably in a highly collaborative, cross-functional, team-oriented, and matrixed environment Desire and demonstrated ability to thrive and produce results in a fluid, dynamic, and fast-paced environment Demonstrated ability to learn new and complex topics quickly Resourceful problem-solver who collaboratively identifies effective paths forward with demonstrated expertise in executing productization efforts Passion for solving complex problems and challenges in a highly technical and scientific environment Desirable Skills or Knowledge PhD in quantum computation, physics, computer science, or a directly related field Familiarity with concepts in quantum computing such as error correction / fault tolerance, native gate decomposition, qubit mapping and routing, and variational quantum algorithms Experience with material science applications of quantum computers Familiarity with best practices of professional software engineering such as coverage, integration tests, type checking, unit tests, and version control Experience with backend development with tools such as FastAPI for web frameworks and PostgreSQL/SQLAlchemy for databases Experience with cloud development, especially on GCP and AWS Familiarity with CI/CD, automated actions, issue tracking, version control, and other features on GitHub Familiarity with security core best-practices such as access control, encryption at rest, key rotation, and logging Exposure to or interest in front-end / GUI development, e.g., HTML/CSS, React, PyQt. In addition to your base compensation, we offer a generous Total Rewards program which includes: Competitive salary Incentive Stock Option Plan Generous company 10% pension contribution regardless of employee contribution Unlimited PTO BUPA healthcare after probation period Cycle to work and Technology scheme #J-18808-Ljbffr
Quantum Software Engineer - Algorithms & Applications employer: Infleqtion Inc.
Infleqtion is an exceptional employer that offers a unique opportunity to work at the forefront of quantum technology in a collaborative and innovative environment. With a strong focus on employee growth, you will gain hands-on experience with cutting-edge quantum hardware while being mentored by world-class physicists and engineers. The company promotes a supportive culture that values diversity and inclusion, ensuring that every team member can thrive and contribute meaningfully to groundbreaking advancements in quantum computing.
