Quantum Applications Software Developer



Software Engineering, IT
Palo Alto, CA, USA
Posted on Thursday, September 7, 2023

PsiQuantum is on a mission to build the world’s first utility-scale, 1 million-plus qubit quantum computer, powered by breakthroughs in silicon photonics and quantum architecture. We were founded in 2015 by the world’s foremost experts in photonic quantum computing and have assembled a world class team dedicated to bringing the world-changing benefits of quantum computing into reality.

Quantum computing is anticipated to unlock the solutions to otherwise impossible computational tasks, with impact across science, technology, and business. By harnessing the laws of quantum physics, quantum computers are expected to dramatically outperform even the most powerful existing (or future) supercomputers and offer the potential to enable extraordinary advances across a broad range of applications including climate, energy, healthcare, finance, agriculture, transportation, materials design, and more, as well as deliver entirely new industries.

PsiQuantum is uniquely positioned to deliver on the promise of quantum computing. We have already demonstrated that it’s possible to manufacture core quantum components using the standard and scalable manufacturing processes of a world-leading semiconductor fab.

Our team is working across the full stack of quantum computing, from hardware design, manufacturing, and packaging through to quantum architecture and quantum algorithms. We’re a highly integrated, collaborative group and love tackling problems than span across interfaces.

There’s more work to be done and we are looking for exceptional talent to join us on this extraordinary journey!

Job Summary:

PsiQuantum’s applications team is uniquely focused on algorithms in the fault tolerant regime and is very tightly integrated with quantum architecture development. Within that team, the role of a quantum applications software engineer is to design, build and deploy tools which drive the development of quantum applications for solving the world’s most pressing problems. As a crucial member within the team, a quantum application software engineer’s job is to work closely with quantum applications architects and engineers to develop software toolkits and workflows, without which the team could not do their job. Such tools include (but are not limited to): quantum simulators, quantum resource estimators, quantum circuit compilation, and domain-specific quantum application integration. This work takes quantum algorithms from concept to reality, may involve close collaboration with external partners on specific use cases, and directly enables the discovery of both new quantum application use-cases and novel algorithmic techniques.


  • Lead the design, development, and deployment of quantum applications software tools to support both internal and external users.
  • Maintain, service and upgrade a high-quality codebase supported by a fast and reliable simulation infrastructure.
  • Work closely with internal and external partners and other members of the quantum applications team to design, implement and analyze quantum algorithms for real-world use cases.
  • Assist with full system analysis to evaluate and optimize resource requirements for fault tolerant computations.
  • Assist with the optimization of quantum algorithms at the subroutine, circuit, and compiled gate-set level.


  • Graduate degree in Physics, Math, or Computer Science or equivalent required (MSc or PhD).
  • Practical experience in quantum computing, programming quantum applications, or quantum circuit compilation.
  • 5+ years professional experience programming and releasing production code in Python, C++, or similar languages.
  • Experience with quantum algorithms or compiling in the regime of fault tolerant gates preferred.
  • Experience with deployment of code in distributed environments, cloud application development, and RESTful API-driven architectures.
  • A results-driven “doer”, preferably with experience in a high-throughput, rapid-delivery work environment.
  • A problem solver, with an analytical mindset.
  • Proven team player with an ability to work effectively across departments, sites, and time zones.
  • Ability to work independently and contribute in fast-moving start-up environment.

The base annual salary range for this full-time role is between $132,500 to $175,000. This range reflects the minimum and maximum target range for new hire base salary across all US locations. Actual compensation may vary outside of this range and is dependent on various factors including but not limited to a candidate's qualifications including relevant education and training, competencies, experience, geographic location, and business needs. Base pay is only one part of the total compensation package. Full time roles are eligible for equity and benefits. Base pay is subject to change and may be modified in the future.

PsiQuantum provides equal employment opportunity for all applicants and employees. PsiQuantum does not unlawfully discriminate on the basis of race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), gender identity, gender expression, national origin, ancestry, citizenship, age, physical or mental disability, military or veteran status, marital status, domestic partner status, sexual orientation, genetic information, or any other basis protected by applicable laws.

We are not accepting unsolicited resumes from employment agencies.