Infleqtion

Full-stack quantum hardware and software

Quantum Software Engineer - Algorithms & Applications

Software EngineeringPosted on Nov 11

Full-time

About the Job

Requirements

A master's degree in quantum applications, mathematics, engineering, physics, or a directly related field is required.
High proficiency in programming is required; fluency in Python is preferable.
Experience with open-source quantum software frameworks such as Cirq or Qiskit is required.
The role requires professional-level verbal, written, and presentation communication skills and the ability to work with people at all organizational levels.
The role requires the ability to work comfortably in a highly collaborative, cross-functional, team-oriented, and matrixed environment.
The candidate must be able to learn new and complex topics quickly and produce results in a dynamic, fast-paced environment.
The candidate should be a resourceful problem-solver able to identify effective paths forward collaboratively and demonstrate expertise in executing productization efforts.
A PhD in quantum computation, physics, computer science, or a directly related field is desirable.
Familiarity with quantum computing concepts such as error correction and fault tolerance, native gate decomposition, qubit mapping and routing, and variational quantum algorithms is desirable.
Experience with material science applications of quantum computers is desirable.
Familiarity with professional software engineering practices such as coverage, integration tests, type checking, unit tests, and version control is desirable.
Backend development experience using tools such as FastAPI for web frameworks and PostgreSQL or SQLAlchemy for databases is desirable.
Cloud development experience, especially on GCP and AWS, is desirable.
Familiarity with CI/CD, automated actions, issue tracking, version control, and other GitHub features is desirable.
Familiarity with security best practices such as access control, encryption at rest, key rotation, and logging is desirable.
Exposure to or interest in front-end or GUI development, such as HTML/CSS, React, or PyQt, is desirable.

Responsibilities

Conduct research and development toward advances in quantum technology, focusing on quantum applications and algorithms.
Deploy software optimizations to the Superstaq cloud platform using industry-grade procedures, including documentation, linting, testing, and type checking.
Interface with Superstaq customers to understand their needs and support them in a timely manner.
Contribute to developing government and commercial proposals and executing global programs.
Collaborate with experimental physicists and software engineers to translate theoretical concepts into practical implementations.
Publish research findings in scientific journals and present them at conferences.
Stay current with developments in quantum computer architecture, quantum compilation, and related fields.
Provide guidance and support to other team members and foster a collaborative research environment.

Desired Qualifications

Familiarity with quantum computing concepts such as error correction and fault tolerance, native gate decomposition, qubit mapping and routing, and variational quantum algorithms.
Experience with material science applications of quantum computers.
Familiarity with professional software engineering practices such as coverage, integration tests, type checking, unit tests, and version control.
Backend development experience using tools such as FastAPI for web frameworks and PostgreSQL or SQLAlchemy for databases.
Cloud development experience, especially on GCP and AWS.
Familiarity with CI/CD, automated actions, issue tracking, version control, and other GitHub features.
Familiarity with security best practices such as access control, encryption at rest, key rotation, and logging.
Exposure to or interest in front-end or GUI development, such as HTML/CSS, React, or PyQt.

Quantum Software Engineer - Algorithms & Applications

Infleqtion · Kidlington, United Kingdom (Hybrid) · Full-time · Posted 2026-11-11

Workplace: hybrid

Department: Engineering and Software Development

Description

ABOUT THE COMPANY

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.

LOCATION

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.

POSITION SUMMARY

Infleqtion is seeking a Quantum Software Engineer to develop cutting-edge applications and algorithms for next-generation quantum computers. In this role, you will design, implement, and optimize quantum algorithms across domains such as simulation, optimization, sensing-enhanced workflows, and hybrid quantum-classical computation. You will work closely with hardware, control, and research teams to translate theoretical advances into performant, executable workloads, leveraging modern quantum SDKs, compiler toolchains, and resource estimation frameworks. The ideal candidate combines strong foundations in quantum algorithms and computational mathematics with practical software engineering expertise, enabling them to build scalable, testable, and high-impact quantum applications that push the boundaries of near-term and fault-tolerant quantum systems.

JOB RESPONSIBILITIES

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.

Conduct R&D toward cutting-edge advances in quantum technology with a focus on quantum applications and algorithms
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

Requirements

Masters’s degree in quantum applications, mathematics, engineering, physics or a directly related field. Must
High proficiency in programming, with fluency in Python preferable.
Experience with open-source quantum software frameworks such as Cirq or Qiskit;
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

Desirable Skills or Knowledge

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 material science applications of quantum computers
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.

EQUAL OPPORTUNITY

Regardless of your interest in the quantum industry, you can take pride in the fact that Infleqtion is building an ecosystem of quantum technologies and commercial products, driving the industry towards the future. Studies reveal that while men apply for jobs when they meet an average of 60% of the requirements, women and other groups tend to apply only when they meet all the criteria. If you believe you have the potential but don't meet every single point in our job advertisement, please don't hesitate to contact us! We would love to chat with you and see how you could bring great value to our team. Our goal is to find exceptional individuals who can enrich our team culture, actively contribute, and have a genuine passion for their work. Here you have freedom to embrace your whole self: who you love, your gender identity and expression, skin colour, 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.

Benefits

In addition to your base compensation, we offer a generous Total Rewards program which includes:  

Competitive salary
Incentive Stock Option Plan
Generous company 10% pension contribution regardless of employee contribution
Unlimited PTO
BUPA healthcare after probation period
Cycle to work and Technology scheme

Apply

Apply at Infleqtion

About the Company

Infleqtion

Full-stack quantum hardware and software

Infleqtion develops neutral-atom quantum hardware and software for computing, sensing, and security. Its hardware uses lasers to cool and trap neutral atoms to perform quantum operations, with products like the Sqale quantum processor, Tiqker optical atomic clocks, quantum RF receivers, and inertial sensors. The software is Superstaq, a hardware-agnostic compiler that optimizes quantum algorithms for execution on different quantum devices, potentially improving performance for some workloads. The company differentiates itself through vertical integration of core hardware and software and by pursuing a broad neutral-atom platform, serving government and commercial customers with a goal of accelerating practical quantum adoption and expanding its addressable markets.

Company size: 201-500
Company stage: IPO
Headquarters: Louisville, CO
Founded: 2007

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