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Principal Test Software Engineer I

CesiumAstro

Westminster, CO permanent

Posted: March 24, 2026

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Quick Summary

Develop and deploy cutting-edge software solutions for satellite and airborne platforms.

Job Description

Please Note: To conform with the United States Government Space Technology Export Regulations, the applicant must be a U.S. citizen, lawful permanent resident of the U.S., conditional resident, asylee or refugee (protected individuals as defined by 8 U.S.C. 1324b(a)(3)), or eligible to obtain the required authorizations from the U.S. Department of State.

At CesiumAstro, we are developers and pioneers of out-of-the-box communication systems for satellites, UAVs, launch vehicles, and other space and airborne platforms. We take pride in our dynamic and cross-functional work environment, which allows us to learn, develop, and engage across our organization. If you are looking for hands-on, interactive, and autonomous work, CesiumAstro is the place for you. We are actively seeking passionate, collaborative, energetic, and forward-thinking individuals to join our team.

We are looking to add a Principal Test Software Engineer I to our team. If you enjoy working in a startup environment and are about developing leading-edge hardware and software for satellites, spacecraft, and aerospace systems, we would like to hear from you.

In this position, you will be responsible for software products necessary throughout all phases of test and integration. Key projects will include developing and managing software for interfacing with flight hardware and test equipment in an abstract and flexible manner that can be quickly implemented into a variety of test campaigns, developing methods to store and access generated data, and equipping the test team with other software tools necessary to efficiently accomplish ambitious testing goals.


JOB DUTIES AND RESPONSIBILITIES:
• Design test solutions for flight hardware optimizing for reliability and efficiency.

• Develop a modular, reusable test and automation software in Python (or similar languages) to be implemented in a variety of test applications to verify design and build quality.

• Write software to interact with both units under test and the test equipment.

• Develop custom automation solutions to facilitate testing, data storage, equipment tracking, and other tasks.

• Define and implement project plans, identify and manage milestones, and set clear actionable goals that work in cooperation with goals across the company.

• Identify areas that could benefit from automation, propose plans, and implement solutions.

• Work closely with and receive feedback from engineering and manufacturing team members to improve test methodology in order to increase product reliability and yield.


JOB REQUIREMENTS AND MINIMUM QUALIFICATIONS:
• Bachelor’s degree in Computer Engineering, Computer Science, Electrical Engineering, or Physics.

• Minimum of 9 years of experience with a bachelor’s degree or 4 years of experience with a master’s degree.

• Experience with hardware development or test software development.

• Programming experience using Python, LabVIEW, SQL, MATLAB, or Embedded C.


PREFERRED QUALIFICATIONS:
• Experience working in a version-controlled environment (Git or SVN).

• Knowledge of Windows and Linux operating systems, VLANs and network security.

• Experience developing graphical user interfaces for a production environment.

• Extensive knowledge with a range of digital and analog interfaces including GPIB, USB, VISA, TCP/IP, VLAN, CAN bus, SPI, I2C, and analog-to-digital conversion.

• Understanding and experience in environmental testing such as vibration, shock, thermal, burn-in, TVAC, EMI/EMC, and radiation effects.

• Experience with remote control of test equipment including power supplies, digital oscilloscopes, DMMs, spectrum analyzers, RF signal generators, and vector signal analyzers.

• Experience programming test equipment using SCPI.


CesiumAstro considers several factors when extending an offer, including but not limited to, the role and associated responsibilities, a candidate’s work experience, education/training, and key skills. Full-time employment offers include company stock options and a generous benefits package including health, dental, vision, HSA, FSA, life, disability and retirement plans.

CesiumAstro is an Equal Opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, protected Veteran Status, or any other characteristic protected by applicable federal, state, or local law.

Please note: CesiumAstro does not accept unsolicited resumes from contract agencies or search firms. Any unsolicited resumes submitted to our website or to CesiumAstro team members will be considered property of CesiumAstro, and we will not be obligated to pay any referral fees.

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