Principal Antenna Design Engineer

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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 Cesium Astro
, 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, Cesium Astro 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 Antenna Design Engineer I to our team. The ideal candidate has experience in designing, simulating, building, and testing high‑frequency antennas made in printed circuit board (PCB) processes. If you enjoy working in a startup environment, and are passionate about developing leading‑edge RF hardware for satellites, spacecraft, and aerospace systems, we would like to hear from you.

As a Cesium hardware team member, you will be responsible for antenna designs from initial concept through requirements definition, topology selection, detailed design, analysis, optimization, manufacturing, testing, qualification, and in‑orbit support of Cesium's products. The work will include many aspects of phased array communication systems, including RF front‑ends, beamformers, power dividers, and phased array antennas.

The successful candidate will also present engineering design review materials to our customers and executive team, as well as participate in proposal‑writing efforts. As such, excellent written and verbal communication skills are required.

This role will initially be remote, with a planned transition to in‑person work once our Florida office is established.

• Bachelor of Science (BS) degree or higher in Electrical Engineering or Physics from an accredited university or institution.
• Minimum of 9 years of industry or university research experience in antenna design, analysis, optimization, fabrication, and test.
• Phased array design and development.
• Expert‑level proficiency in 3D electromagnetic simulation tools such as CST or HFSS.
• Strong experience with EDA tools such as Altium.
• Hands‑on experience with lab instruments such as vector network analyzers, spectrum analyzers, signal generators, and oscilloscopes.
• Excellent written and verbal communication skills.

• Antenna design in frequency bands above 20 GHz.
• Aerospace electronics design, development, and qualification.
• EMI/EMC design and mitigation techniques.

Cesium Astro 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.

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

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

• Mid‑Senior level

• Full‑time

• Engineering and Information Technology

• Defense and Space Manufacturing