Full-Time
Quantum Software Engineer
Applications
Posted on 8/8/2025
Infleqtion
51-200 employees
Edge-ready quantum hardware and software
Compensation Overview
$115k - $175k/yr
Chicago, IL, USA
In Person
 Software Engineering (2) |
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- BS or MS in computer science, mathematics, statistics, physics, or another closely related field
- Experience in designing and evaluating quantum algorithms
- Experience developing and demonstrating quantum software
- Experience performing quantum resource estimation for target applications and their identified quantum solutions
- Familiarity with common quantum software languages, tools, and packages (e.g. Qiskit, Cirq, Superstaq, OpenFermion, Stim, CUDA-Q)
- Demonstrated ability to understand end user needs and connect real-world challenges with quantum solutions
- 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 travel domestically and (potentially) internationally up to 10%
- Contribute to the development of quantum algorithmic solutions for real-world problems by developing and implementing custom quantum software, including testing and evaluation through simulation and hardware execution
- Customer-centric focus on solving end-user needs and proposing new work to customers
- Stay up-to-date on literature, assess and pursue cutting edge quantum algorithms for novel applications
- Communicate and interpret cutting-edge research in both theory and experiment with colleagues
- 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 algorithms and quantum application development
- Provide guidance and support to other team members, working closely with them to foster a collaborative research environment
- Ph.D. in computer science, mathematics, statistics, physics, or another closely related field
- Strong scientific publication record
- Domain experience in condensed matter, quantum chemistry, materials science, or similar
- Experience evaluating and implementing quantum error correction protocols
Infleqtion (formerly ColdQuanta) develops quantum-enabled hardware and software designed for edge use. It builds portable quantum devices such as quantum sensors and ion-based systems, plus modular components and plug-and-play solutions that maintain data integrity from edge to computer. Its software platform, Superstaq, lets users write quantum programs in any language and run them on any quantum computer, enabling performance gains on standard benchmarks. The company differentiates itself by focusing on hardware-as-a-service at the edge, offering a broad range of ready-to-use devices and a versatile software stack, rather than just large quantum computers. It collaborates with the Department of Energy to speed commercialization and broaden adoption. The overall goal is to accelerate the deployment of quantum technology across research labs and businesses by providing accessible hardware and cross-backend software that integrates smoothly with existing systems.
Company Size
51-200
Company Stage
IPO
Headquarters
Boulder, Colorado
Founded
2007
Simplify's Take
What believers are saying
- 2026 revenue guidance hits $40 million, up from $32.5 million in 2025 amid demand growth.
- NASA ISS upgrade and Quantum Gravity Gradiometer secure over $20 million in contracts.
- Safran partnership launches quantum timing solution for defense and telecom markets.
What critics are saying
- IonQ's 429% revenue growth captures market share from Infleqtion's neutral atoms within 12 months.
- $28.1 million operating loss burns 70% of $40 million 2026 revenue, exhausting cash by 2027.
- 48.6% YTD stock decline triggers dilution via equity raises and talent exodus by Q4 2026.
What makes Infleqtion unique
- Neutral-atom technology enables smaller, power-efficient quantum systems without cryogenic refrigeration.
- Superstaq software compiles quantum programs across multiple hardware platforms seamlessly.
- Tiqker quantum optical clocks deliver picosecond accuracy for GNSS-denied environments.
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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
Company Equity
Growth & Insights and Company News
6 month growth
↑ 1%1 year growth
↑ 0%2 year growth
↓ -2%Quantum computing stocks are attracting strong analyst interest as the sector grows rapidly. Precedence Research values the quantum computing market at $1.44 billion in 2024, projecting it will reach $19.44 billion by 2035, representing a 29.7% CAGR. IonQ, using trapped ion technology, raised analyst attention after posting $61.9 million in 4Q25 revenues, up 429% year-over-year. Jefferies rates it a Buy with a $90 target, implying 213% upside. D-Wave Quantum's dual-platform approach combining annealing and gate-model systems has earned a unanimous Strong Buy rating from analysts, with a $38.18 average target suggesting 168% gains. Infleqtion, the sector's newcomer using neutral atom technology, went public in February through a SPAC transaction that raised $550 million. BTIG rates it a Buy with a $22 target, representing 75% potential upside.
Infleqtion, a quantum computing and sensing company, has announced 2026 revenue guidance of $40 million, reflecting growing customer demand for its neutral-atom quantum technologies. The company reported 2025 revenue of $32.5 million and a non-GAAP operating loss of $28.1 million. Recent business highlights include launching a quantum-enabled precision timing solution with Safran Electronics & Defense in April 2026, and delivering the UK's only operational 100-physical qubit quantum computing system to the National Quantum Computing Centre in March. The company secured additional funding through ARPA-E's QC3 programme and NASA's Quantum Gravity Gradiometer Pathfinder mission, bringing contracted funding to over $20 million. Chief executive Matthew Kinsella cited strengthened business operations and expanding customer relationships across defence, telecommunications and critical infrastructure sectors.
Infleqtion launches quantum timing solution with Safran partnership. Credit: Infleqtion Infleqtion has announced availability of its first quantum-enabled precision timing solution delivered as part of the company's partnership with Safran Electronics & Defense. The new solution includes Infleqtion's Tiqker quantum optical clock, which has been integrated and validated with Safran's White Rabbit and SecureSync systems. Modern systems, from financial markets to military operations, telecom networks and datacenters, depend on technologies such as GPS or GNSS for precise timing, but these are vulnerable to jamming, spoofing, and natural disruption. As threats to traditional timing infrastructure grow, the need for resilient, independent alternatives has become critical. In a recent live demonstration conducted in partnership with Quantum Corridor, the solution integrating Tiqker, White Rabbit and SecureSync system was validated in a real-world environment, demonstrating picosecond accuracy vs. nanosecond GPS accuracy. The combined, validated solution delivers enhanced stability and resilience, ensuring continuity of operations for mission-critical systems even in environments where traditional timing signals are challenged or denied. The collaboration between Infleqtion and Safran Electronics & Defense makes the validated solution available to customers globally, across allied defense, telecommunications, and critical infrastructure sectors, enabling rapid deployment of precision timing architectures designed to operate even in GNSS-challenged environments.
Infleqtion has delivered the UK's only operational 100 physical qubit quantum computing system to the National Quantum Computing Centre, marking a significant infrastructure milestone. The company has also been selected for US Department of Energy ARPA-E funding focused on quantum algorithms for advanced energy materials. Despite these technological advances, Infleqtion's share price has experienced significant volatility, trading at $8.81 with a 40.1% decline over 30 days and 48.6% year-to-date decline. The stock fell 12.6% over the past week. The developments position Infleqtion in sovereign infrastructure and energy-focused materials research. The UK testbed provides a reference site for researchers to test its neutral atom hardware, whilst the ARPA-E grant connects the technology to high-temperature superconductors and energy materials applications.
Infleqtion has delivered the UK's only operational 100-physical-qubit quantum computing system at the National Quantum Computing Centre, achieving a milestone critical to the UK's quantum strategy. The Sqale platform, delivered in December 2025, uses neutral-atom technology. The deployment is part of the NQCC's Quantum Computing Testbed Initiative, enabling researchers to evaluate performance, benchmark applications and study how neutral-atom systems scale. Infleqtion is targeting over 30 logical qubits in 2026 and more than 100 logical qubits in 2028. Infleqtion's neutral-atom approach has already been deployed in operational environments beyond laboratories, including quantum flight trials and underwater autonomous vehicles. The company's two-qubit gate fidelity of 99.73% delivers industry-leading performance, requiring fewer physical qubits per logical qubit for improved scalability.