I

Infleqtion

Full-stack quantum hardware and software

Quantum Integrations Engineer

Full-TimeUpdated on 10/23/2026
$145k - $170k/yr+ 401(k) Match + Equity Package
Mid
Bachelor's, Master's
Chicago, IL, USA
HybridHybrid workplace in Chicago.
Software EngineeringBackend Engineering

About the job

Requirements
  • A Bachelor of Science or Master of Science in Computer Science, Software Engineering, Computer Engineering, Physics, Applied Mathematics, Electrical Engineering, or a closely related field is required.
  • High proficiency in software development is required; fluency in Python is preferable, and proficiency in C++, Rust, Go, Java, or Julia is beneficial.
  • Experience designing, developing, and maintaining production-quality software is required.
  • Experience designing and consuming APIs, including RESTful services, RPC frameworks, SDKs, or equivalent software interfaces, is required.
  • Experience integrating software systems developed by different organizations or teams is required.
  • Familiarity with distributed computing, cloud computing, or high-performance computing environments is required.
  • Familiarity with modern software architecture concepts, including APIs, services, authentication, asynchronous workflows, job queues, data serialization, and distributed systems, is required.
  • Experience with backend development using frameworks and technologies such as FastAPI, Flask, Django, gRPC, PostgreSQL, SQLAlchemy, or equivalent tools is required.
  • Experience with cloud development, preferably on AWS, GCP, or Azure, is required.
  • Familiarity with containerization and deployment technologies such as Docker and Kubernetes is required.
  • Familiarity with continuous integration and continuous delivery, automated testing, issue tracking, version control, and collaborative software-development workflows is required.
  • Familiarity with professional software-engineering practices such as unit testing, integration testing, type checking, code review, observability, and maintainable API design is required.
  • Ability to collaborate directly with external engineering teams and translate between different technical architectures, terminology, and organizational requirements is required.
  • Ability to work comfortably in a highly collaborative, cross-functional, team-oriented, and matrixed environment is required.
Responsibilities
  • Design, develop, test, and maintain integrations between the company’s quantum software and external software platforms, scientific applications, cloud environments, high-performance computing systems, and enterprise computing tools.
  • Integrate the company’s quantum computing capabilities, including Superstaq and related software interfaces, with domain-specific applications, development environments, orchestration platforms, and partner software ecosystems.
  • Work directly with ecosystem partners to understand their architectures, APIs, workflows, technical constraints, and integration requirements.
  • Collaborate with partner engineering teams to define interfaces and integration architectures that provide access to quantum computing within existing customer and developer workflows.
  • Develop APIs, software development kit integrations, plugins, adapters, workflow connectors, reference implementations, and other software components that connect company systems with third-party platforms.
  • Build and maintain integrations with cloud, high-performance computing, artificial intelligence, and scientific-computing environments.
  • Develop prototypes and proofs of concept with strategic partners to validate integration approaches and identify technical requirements for production deployment.
  • Collaborate with quantum software engineers to translate application prototypes and quantum algorithms into deployable workflows within external software platforms.
  • Collaborate with quantum software and systems engineers to reflect external integration requirements in software architecture, APIs, developer tooling, and the product roadmap.
  • Develop abstractions that allow users and partners to interact with quantum computing resources without detailed knowledge of the underlying hardware implementation.
  • Design solutions for hybrid quantum-classical workflows, including job submission, orchestration, data movement, resource management, result processing, and interaction with classical compute resources.
  • Develop and maintain integration documentation, technical specifications, reference architectures, tutorials, and developer examples for internal and external users.
  • Establish automated testing, monitoring, and validation approaches to ensure integrations remain reliable as company and partner software evolve.
  • Troubleshoot complex integration issues across quantum software, cloud infrastructure, networking, authentication, partner applications, and external APIs.
  • Contribute to technical workshops and design sessions with strategic ecosystem partners and end users.
  • Stay up to date with developments in quantum software, cloud computing, high-performance computing, artificial intelligence infrastructure, scientific-computing platforms, APIs, and software integration technologies.
  • Provide guidance and support to other team members and foster a collaborative engineering environment.
Desired Qualifications
  • An advanced degree in computer science, software engineering, quantum computation, physics, or a directly related field is preferred.
  • Experience developing quantum computing software or integrating quantum computing systems with classical software environments is preferred.
  • Experience using AI-assisted software-development tooling such as Codex is preferred.
  • Experience with, or demonstrated ability to rapidly learn, open-source quantum software frameworks such as Cirq, Qiskit, PennyLane, CUDA-Q, or equivalent technologies is preferred.
  • Experience integrating software into scientific or engineering applications used in computational chemistry, materials science, life sciences, optimization, machine learning, or high-performance computing is preferred.
  • Familiarity with deployment requirements for regulated, government, national-security, or other security-sensitive computing environments is preferred.
  • Familiarity with front-end or graphical user interface development for partner-facing integrations, including React, JavaScript, HTML/CSS, or equivalent technologies, is preferred.

About the company

I

Infleqtion

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Infleqtion builds neutral-atom quantum hardware and complementary software for computing, sensing, and security. Its hardware uses lasers to cool and trap neutral atoms and perform quantum operations, with products like Sqale for computation, Tiqker clocks for precise timing, RF receivers for spectrum sensing, and inertial sensors for GPS-denied navigation; its Superstaq software optimizes algorithms across different quantum machines. The company differentiates itself by vertically integrating hardware and software and leveraging neutral-atom technology to scale, along with a history of strategic acquisitions and a NYSE listing. Its goal is to accelerate practical quantum adoption by expanding its roadmap and serving government and commercial customers across computation, sensing, navigation, and secure communications.

Company Size

201-500

Company Stage

IPO

Headquarters

Louisville, Colorado

Founded

2007

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Simplify's Take

What believers are saying

  • NASA's August 27, 2026 award doubled QGGPf funding to $40 million.
  • September 10, 2026 Cisco collaboration opens distributed-quantum networking and telecom integration opportunities.
  • Shunkai became Japan's first operational neutral-atom quantum computer on September 7, 2026.

What critics are saying

  • Quantum hardware revenues remain contract-driven; NASA's $20 million extension ends after 2027.
  • Cisco and Riverlane can commoditize networking and error-correction layers, squeezing Infleqtion's software moat.
  • If 2030 fault-tolerant milestones slip, investors reprice INFQ as a science project, not a platform.

What makes Infleqtion unique

  • Infleqtion pairs neutral-atom hardware with Superstaq software, plus full-stack sensing and networking, since 2007.
  • On September 24, 2026, Sqale reached 30 entangled logical qubits using 80 physical qubits.
  • The February 2026 NYSE listing raised over $550 million, funding commercialization and deployment.

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Benefits

  • Health Insurance
  • Dental Insurance
  • Vision Insurance
  • Life Insurance
  • Disability Insurance
  • Unlimited Paid Time Off
  • 401(k) Company Match
  • Paid Maternity/Paternity Leave
  • Student Loan Repayment
  • Family Leave
  • Short Term & Long Term Disability
  • Stock Options

Growth & Insights and Company News

6 month growth

1%

1 year growth

-1%

2 year growth

-9%
U.S. Securities and Exchange Commission
Oct 20th, 2026
EX-99.1

Defined terms included below have the same meaning as terms defined and included elsewhere in this Current Report on Form 8-K.

U.S. Securities and Exchange Commission
Oct 20th, 2026
8-K

Date of Report (Date of earliest event reported): February 13, 2026

The Defense Post
Oct 16th, 2026
Infleqtion secures UK funding for quantum signal-tracking system.

Infleqtion secures UK funding for quantum signal-tracking system. 2 minutes read UK-based Infleqtion has received 9 million pounds ($12 million) from the country's national innovation agency to develop a deployable quantum sensing system that can determine the direction of radio frequency (RF) signals, with potential applications in electronic warfare, spectrum monitoring, and navigation. The funding, awarded through UK Innovate's Quantum Missions Primer program, will support the second phase of the Quantum Direction Finding (QuDiFi) project. The project aims to move the technology from prototype testing toward a deployable product, with further work focused on performance, reliability, and evaluation in realistic operating environments. Infleqtion is developing a system called Quantum Spectrum-DF in collaboration with Italian defense company Leonardo. The companies have not disclosed a timeline for operational deployment. Using quantum sensors to locate radio signals. Direction-finding systems determine the direction from which a radio signal originates, helping operators locate transmitters and monitor activity across the electromagnetic spectrum. Military users can apply the technology to electronic intelligence and electronic warfare, while civilian applications include communications monitoring and infrastructure protection. Conventional systems often use multiple antennas to estimate a signal's direction. At lower frequencies, achieving the required performance can involve large antenna structures, creating size and integration challenges for mobile platforms. Infleqtion's approach uses Rydberg atoms, highly excited atoms that are sensitive to electric fields, to detect radio-frequency signals through optical measurements. By analyzing how these atoms respond to electromagnetic fields, quantum sensors can measure RF signals without relying on conventional antenna elements in the same way as traditional systems. The approach could reduce the size of direction-finding equipment and make it easier to integrate onto platforms with limited space. However, its practical advantages will depend on demonstrated performance under operational conditions, including the ability to identify and locate signals amid interference and competing transmissions. Defense and civilian applications. Leonardo is contributing to the effort, with potential applications across its defense electronics portfolio. Compact RF sensing could be relevant to aircraft, naval vessels, and other platforms where the size, weight, and power requirements of electronic systems are important considerations. The technology could also support passive sensing, which receives and analyzes existing transmissions rather than actively emitting a signal. Potential applications include spectrum surveillance and navigation, although these capabilities would require further development and validation. The project builds on broader UK efforts to advance quantum technologies for practical use. Quantum sensing is being investigated for applications including navigation, timing, and the detection of physical phenomena that conventional sensors may struggle to measure. For Infleqtion, the immediate objective is to establish whether Rydberg-atom sensing can deliver reliable direction finding in a compact, field-ready system. The funding will support that development, but the technology's eventual military and civilian roles will depend on the results of testing and subsequent integration work.

YFarmX
Oct 14th, 2026
Infleqtion wins £9 million for quantum radio direction-finding.

Infleqtion wins £9 million for quantum radio direction-finding. Innovate UK awarded Infleqtion £9 million to develop deployable Rydberg-atom radio direction-finding equipment with Leonardo, building on the QuDiFi prototype project. 00:0003:17 Infleqtion has won £9 million from Innovate UK to develop deployable quantum equipment for locating the direction of radio signals. The company announced the award on 13 October, with Leonardo collaborating on the project. The funding announcement covers the second phase of Quantum Direction Finding, or QuDiFi, within the Quantum Missions Primer programme. Infleqtion aims to build a Quantum Spectrum-DF product suited to realistic operating environments. The award takes a prototype towards field use. The next QuDiFi phase focuses on turning a tested prototype into robust equipment. Infleqtion describes work on performance, reliability, usability and validation in conditions representative of deployment. UKRI's November 2025 project announcement set out the earlier prototype programme under the lead name Coldquanta UK Limited. It covered sensor-head design, signal processing and integration with existing radio-frequency platforms, with a pathway towards smaller equipment and field trials. The new award continues that progression. A laboratory measurement can establish the sensing principle; a deployable product also has to keep working when its surroundings, platform and operator change. Highly excited atoms sense the radio field. Rydberg-atom sensors use atoms in highly excited states whose response to an electric field can be measured optically. Lasers probe the atomic response, providing information about an incoming radio signal. Radio direction-finding adds a spatial question: where is the signal coming from? A sensor can infer direction by comparing measurements taken at different positions or by analysing the field's pattern. A 2021 NIST demonstration measured the phase of a 19.18 GHz signal at two locations inside a caesium vapour cell. The phase difference allowed researchers to calculate its direction of arrival and compare it with a model. That earlier experiment illustrates the sensing principle behind this wider field of research. Compact sensors could fit on more platforms. Infleqtion aims to reduce the size of radio direction-finding equipment, particularly where conventional low-frequency systems require large antenna structures. Its proposed product uses optical measurements of atoms to support compact, broadband, passive sensing. That is relevant to platforms with limited space for antennas and associated electronics. The funded development will test whether the sensing approach can deliver useful performance in a practical package. The company's Quantum Spectrum product information describes its broader atomic radio-sensing approach. The new direction-finding project applies it to detecting and locating signals, with future applications including spectrum surveillance, passive radar and resilient navigation. Leonardo brings operational sensing requirements. Leonardo is collaborating with Infleqtion on the development programme. The award announcement includes Oliver Sims, Leonardo's electronic-warfare chief technologist, describing the potential to reduce the physical footprint of direction-finding systems. Innovate UK, part of UK Research and Innovation, is funding the work. The £9 million is an award for continued product development, with Infleqtion giving an approximate US-dollar equivalent of $12 million. The next test is whether the prototype's sensing capability can be retained in equipment that is reliable, usable and suited to its intended operating environment. That transition is the focus of the funded second phase.

Quantum Zeitgeist
Oct 13th, 2026
Infleqtion UK wins Innovate UK funding to build deployable Rydberg atom direction finder

Infleqtion UK is developing a quantum radio frequency direction finding system with funding from Innovate UK. The amount was not disclosed. The product, called Quantum Spectrum-DF, uses Rydberg atoms to detect and locate high-frequency signals with optical techniques instead of conventional antennas. Infleqtion says this allows a compact system for platforms that cannot carry traditional equipment because of weight or space limits. Leonardo is working with Infleqtion on the project. "For defence platforms, reducing size, weight and power consumption while preserving operational effectiveness is a significant advantage," said Oliver Sims, electronic warfare chief technologist at Leonardo. The system builds on an earlier tested prototype and targets defence and civilian uses, including spectrum surveillance, passive radar, and resilient navigation.