Quantum Software Engineer (Compiler)

Infleqtion; Chicago (IL); On-site; USD 145,000 - 170,000; Full time

Benefits offered by this job

100% company-paid medical, dental, and

Vision, disability coverage

Employer-funded Health Savings Account

Unlimited PTO

401(k) match

Company-paid Life and AD&D Insurance

Flexible Spending Account

Paid FMLA, Maternity/Paternity Leave

Employee Assistance Program

Student Loan Repayment

Equity Package

Job summary

Infleqtion is seeking a Quantum Software Engineer to join the Compiler Team within its Quantum Software organization. You will design, build, and maintain quantum compilation software, collaborating across applications, algorithms, hardware, and control.

This role blends coding, code review, and system design with R&D, and welcomes both entry and senior level candidates. You will work on cutting-edge quantum technology, deploy optimizations to Superstaq, and engage with customers while

Qualifications

• Bachelor’s degree in computer science, engineering, physics or a directly related field.
• Strong programming skills with Python preferred; other languages welcome.
• Experience with Cirq or Qiskit and ability to modify libraries.
• Excellent written and verbal communication; able to work across teams.

Responsibilities

• R&D toward quantum compilation advances within Infleqtion’s Quantum Software team.
• Deploy software optimizations on the Superstaq cloud platform with proper testing and docs.
• Interface with customers to understand needs and provide timely support.
• Contribute to government and commercial proposals and execution on programs.
• Collaborate with experimental physicists and software engineers to bridge theory and practice.
• Publish research findings and present at conferences; stay current on quantum compilers.
• Provide guidance to teammates and foster a collaborative research environment.
• Bachelor’s degree holders and above may be considered; on-site three days/wk and travel up to 10%.

Skills

Python

C/C++

Julia

Cirq

Qiskit

Open‑source quantum frameworks

Software engineering

Cloud platforms

Education

Bachelor’s degree in CS/Engineering/Physics

PhD in quantum computing or related field

Tools

FastAPI

PostgreSQL/SQLAlchemy

Linux tooling

Job description

Position Summary

This Quantum Software Engineer role will join the Compiler Team within Infleqtion’s Quantum Software organization. This role will be responsible for designing, building, and maintaining quantum compilation software alongside considerable involvement in co-design efforts that span the full quantum stack, including applications, algorithms, hardware and control. This role combines hands‑on coding, code review, and system design with R&D. Ideal candidates have a strong software development background and familiarity with quantum computation.

This role is open to both entry‑level and senior‑level candidates.

Job Responsibilities

• Conduct R&D toward cutting‑edge advances in quantum technology with a focus on quantum compilation, similar to work described in https://arxiv.org/abs/2309.05157 and https://arxiv.org/abs/2509.13247

• Deploy software optimizations to our cloud platform Superstaq using industry‑grade software engineering procedures including documentation, linting, testing, and type‑checking

• Interface with customers of Superstaq to understand their needs and support them in a timely fashion

• Contribute to development of government and commercial proposals and execution on global programs

• Collaborate with experimental physicists and software engineers to bridge the gap between theoretical concepts and practical implementation

• Engage with the broader scientific community by publishing research findings in scientific journals and presenting at conferences

• Stay up to date with the latest developments in quantum computer architecture, quantum compilation and related fields

• Provide guidance and support to other team members, fostering a collaborative research environment

• Bachelor’s degree in computer science, engineering, physics or a directly related field

• High proficiency in programming, with fluency in Python preferable. Proficiency in alternative languages (e.g. C/C++ or Julia) with the ability to rapidly upskill in Python

• Experience with open‑source quantum software frameworks such as Cirq or Qiskit; ideal candidates will have experience not only using these libraries but also modifying them

• 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

• Ability to be in the office any three days per week

• Ability to travel domestically and (potentially) internationally up to 10%

Preferred Qualifications

• 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 advanced open‑source quantum software frameworks such as Stim

• 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.

• Salary range: $145,000 to $170,000 per year

• 100% company‑paid medical, dental, vision, short/long‑term disability

• Employer‑funded Health Savings Account

• Unlimited PTO

• 401(k) match

• Company‑paid Life and AD&D Insurance

• Flexible Savings Account

• Paid FMLA, Maternity/Paternity Leave

• Employee Assistance Program

• Student Loan Repayment

• Equity Package

Equal Opportunity

Here you have freedom to embrace your whole self: who you love, your gender identity and expression, skin color, age, appearance, disability, neurodiversity, DNA, military/veteran status, citizenship, and other factors that make up who you are. Your uniqueness is valued, welcomed, and appreciated here. We are dedicated to providing a positive workplace and base all employment decisions on your qualifications, performance, merits, as well as business needs. We are proud to be an Equal Employment Opportunity Employer.

Note

This position may require access to information protected under U.S. export control laws and regulations for quantum computing technology. Please note that any offer for employment may be conditioned on authorization to receive software or technology controlled under these U.S. export control laws and regulations without sponsorship for an export license.