Senior Cloud Backend Software Engineer

Senior Cloud Backend Software Engineer

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.

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.

Infleqtion is seeking a Senior Cloud Backend Software Engineer to design and build scalable backend services that power both internal platform infrastructure and externally facing systems for our quantum technologies. This role focuses on developing cloud-native microservice architectures, distributed APIs, and reliable backend systems that support experiment orchestration, data pipelines, device control workflows, and internal developer platforms. You will build and operate services that form the backbone of our quantum software platform, enabling scientists, engineers, and external users to interact with quantum hardware and experimentation workflows through robust, scalable infrastructure. The ideal candidate is comfortable building API-driven services, asynchronous systems, and scalable data infrastructure deployed in containerized and orchestrated cloud environments.

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.

• Design, develop, and operate cloud-native backend services and microservice architectures supporting both internal engineering platforms and externally accessible APIs.
• Build Python-based backend systems using modern frameworks such as FastAPI and SQLAlchemy to implement scalable, maintainable services.
• Architect and implement distributed systems that support experiment orchestration, telemetry collection, data ingestion, and device interaction workflows.
• Design backend systems with strong focus on reliability, scalability, observability, and fault tolerance, including monitoring, logging, tracing, and graceful degradation.
• Deploy and operate services using Docker containers, local development environments with Docker Compose, and production orchestration using Kubernetes.
• Collaborate with interdisciplinary teams including physicists, hardware engineers, and research scientists to translate experimental workflows into scalable software systems.
• Mentor junior engineers and promote best practices in backend architecture, distributed systems design, reliability engineering, and software development.
• Lead architecture discussions, design reviews, and code reviews to maintain high engineering standards and system maintainability.
• Contribute to platform reliability and operational excellence, diagnosing production issues, improving system performance, and strengthening infrastructure resilience.