Senior Software Engineer (Quantum Computing)

Infleqtion; Madison (WI); On-site; USD 160,000 - 185,000; Full time

Benefits offered by this job

Medical coverage

Dental coverage

Vision coverage

Unlimited PTO

401(k) matching

Life Insurance

Student Loan Repayment

FMLA Leave

Job summary

Infleqtion is building brainy quantum computers and seeking engineers to write the software that runs them. This production-first role focuses on backend services and control frameworks used to calibrate neutral atom quantum machines.

You will work alongside physicists and hardware engineers, turning complex scientific requirements into robust software, with extensive Python and C++/Rust work and end-to-end tooling. The role emphasizes hands-on coding and system reliability.

Qualifications

• Bachelor-level degree in a quantitative field (CS, physics, math).
• Production-grade Python and either C++ or Rust experience required.
• Strong discipline: testing, revision control, reliability, and maintainable code.

Responsibilities

• Write, own, and ship production backend services and control frameworks for quantum computers.
• Debug and support all layers of the control stack across real-time to distributed services.
• Build tooling enabling scientists to run experiments independently with minimal translation."
• Develop and maintain CI/CD pipelines and containerized deployments (Docker/Kubernetes).
• Work with experimental data including time-series, SQL/NoSQL databases, and image analysis from live systems.

Skills

Backend engineering

Python

C++

Rust

Data pipelines

NumPy

SciPy

PyTorch

Time-series

Education

BS in Computer Science

Physics

Applied Mathematics

Tools

Docker

Kubernetes

Linux

Git

Job description

Infleqtion is on a mission to commercialize atom-based quantum technologies that deliver orders-of-magnitude improvements in sensing and computing applications. We are seeking self-motivated, energetic individuals with exceptional problem-solving and technical skills to help drive our Quantum Computing mission forward.

We build quantum computers. You will write the software that runs them.

This is a production-first, high-coding role — roughly 90% of your time will be spent writing and owning code, not reviewing or directing others who do. You will work directly alongside physicists and hardware engineers, converting complex scientific requirements into software that controls real quantum machines. If you are looking to step back from the keyboard, this is not that role.

You will

• Write, own, and ship production backend services and control frameworks that directly operate and calibrate our neutral atom quantum computers — if it breaks, you fix it.
• Debug and support every layer of the control stack — from real-time embedded kernels to distributed services — without handing it off when it gets hard.
• Build reliable tooling that lets physicists and hardware engineers run experiments independently, which means understanding what they need well enough to build it without a lengthy translation process.
• Develop and maintain CI/CD pipelines, containerized deployments using Docker and Kubernetes, and Python packages with C++ or Rust extensions in a Linux-native environment.
• Work hands-on with experimental data — time-series, SQL and non-relational databases, and realtime image analysis and object detection from live quantum systems.

You have

• 6+ years of backend software engineering; a degree in Computer Science, Physics, Applied Mathematics, or a field where writing code to solve hard quantitative problems was the norm, not the exception.
• Production-tested Python and hands-on C++ or Rust experience — both is a strong advantage; candidates who bring all three move to the front.
• A track record of rigorous engineering discipline: comprehensive testing, clean revision control, operational reliability, maintainable systems, thorough documentation, and a reflex for code health — not as process, but as habit.
• Real experience with scientific or experimental data pipelines — NumPy, SciPy, PyTorch, time-series storage, and ETL — ideally in a context where data quality directly affected outcomes.
• A science or mathematics background, or verifiable experience embedded with scientists translating research requirements into production software — you can hold your own in a conversation about physics.
• Familiarity with statistics, machine learning, or AMO physics is a genuine differentiator; experience with realtime image analysis and object detection moves you to the top of the list.

The targeted salary range for this role is $160,000 to $185,000 on an annualized basis plus eligibility to participate in our annual incentive plan.

Total Rewards program which includes:

• 100% company paid Employee coverage for Medical, Dental, Vision, and Short/Long Term Disability insurance programs
• Employer funded Health Savings Account
• Unlimited Paid Time Off
• 401(k) Matching Programs
• Company paid Life and AD&D Insurance
• Flexible Healthcare Savings Account
• Paid FMLA Leave
• Paid Maternity/Paternity Leave
• Employer Assistance Program
• Student Loan Repayment

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.

If you need assistance or an accommodation due to disability, please feel free to contact us at [e-mail].