Sr. Software Engineer, Back-end

Job Description

Job Title: Sr. Software Engineer, Back-end. Location: Sydney, Australia

This position offers the opportunity to work with world-class researchers and engineers, contributing directly to software that drives quantum advantage.

Duties:

• Design, develop, and optimize scalable backend services using Python.
• Maintain and enhance the compiler stack for OpenQASM3 and OpenPulse programs;
• Collaborate with researchers and quantum engineers to turn experimental needs into reliable production code.
• Test and validate compiler outputs through hands-on experiments on quantum hardware.
• Build and maintain high-performance APIs using gRPC, GraphQL, and REST.
• Contribute to software design patterns, tools, and best practices that improve quantum control systems.
• Mentor junior engineers and support cross-functional collaboration;
• Write maintainable, testable, and well-documented code aligned with best practices.
• Engage in system-level programming to optimize performance and reliability.

Qualifications:

• Bachelor’s degree in Computer Science, Engineering, or a related field.
• At least 5 years of experience in backend software development using Python;
• Proven ability to write clean, testable, and maintainable code.
• Experience with compiler development or pulse-level programming (OpenQASM3, Qiskit Pulse, or Qua).
• Familiarity with Python web frameworks such as Django, Flask, or FastAPI.
• Strong collaboration and mentoring skills in a team environment.
• Experience with quantum hardware control systems or similar infrastructure;
• Bonus skills include C++ or Rust for CPython extensions, FPGA programming, compiler theory, or low-latency systems.

Benefits and Instructions:

• Competitive salary, equity potential, and comprehensive benefits.
• Flexible hybrid work model based in Sydney, Australia;
• Opportunity to join a globally recognized quantum software company with offices in Sydney, Los Angeles, San Francisco, Berlin, and Oxford.
• Be part of a team that recently raised US$113 million in Series B funding and achieved the first commercial quantum advantage with Ironstone Opal.
• Apply directly through the official Q-CTRL website. Communications will only come from the @q-ctrl.com domain;
• Recruitment agencies are not accepted for this position.