Junior Software Developer jobs in United Kingdom

Quantinuum are seeking a Research Software Engineer to join our growing Quantum Software team in Cambridge, UK. In this role, you will help shape the design and implementation of the Guppy quantum programming language and contribute to the next generation of the TKET quantum compiler. This is a unique opportunity to work at the intersection of software development, compiler design, and quantum computing research.

You will collaborate closely with a small, dynamic team throughout the full development lifecycle — from research and design to programming and testing — with the freedom to think independently and make a real impact.

• Maintain and contribute to a Python-based compiler codebase.
• Design and implement novel features for quantum programming languages.
• Develop and apply optimization methods for quantum programs.
• Collaborate with key stakeholders across research and engineering teams.

• Software development experience, preferably in Python or Rust.
• Broad knowledge of programming languages, paradigms, and compiler concepts.
• Ability to work collaboratively, communicate technical ideas clearly, and write clean, maintainable code.
• Familiarity with collaboration tools (e.g., version control, issue tracking) and development tools (e.g., debugger, profiler, testing frameworks).
• A 2:1 or higher degree in Computer Science, Mathematics, Engineering, or a related discipline.
• Ability to read and implement ideas from technical research materials.
• Knowledge of quantum computing, quantum algorithms, or programming quantum systems is advantageous.

• Experience designing programming languages or domain-specific languages.
• Familiarity with formal methods, type theory, or program verification tools.
• Background in large software system architecture and design.
• Experience with compiler frameworks such as LLVM or MLIR.

Working alongside a highly talented team, with leading names in the quantum computing industry. We offer a highly competitive package, equity, 28 days of paid holiday (in addition to public holidays), a workplace pension, a positive approach to flexible working and enhanced parental and adoption benefits.

Quantinuum is the world’s largest integrated quantum company, driving breakthroughs in materials discovery, cybersecurity, and next-generation quantum AI. With a team of more than 600 employees, including more than 420 of them being scientists and engineers, we are leading the worldwide quantum computing revolution.

By uniting best-in-class software with high-fidelity hardware, our integrated full-stack approach is accelerating the path to practical quantum computing and scaling its impact across multiple industries.

As we celebrate the International Year of Quantum, there has never been a more exciting time to be part of this rapidly evolving field. By joining Quantinuum, you’ll be at the forefront of this transformative revolution, shaping the future of quantum computing, pushing the limits of technology, and making the impossible possible.

Quantinuum is an inclusive equal opportunity employer. You will be considered without regard to age, race, creed, color, national origin, ancestry, marital status, affectional or sexual orientation, gender identity or expression, disability, nationality, sex, or veteran status.