Salary
$133k – $161k per year
Location
In office (Westminster)
Seniority
Senior · 5+ years exp
Visa
H-1B filings in 12 months: 2
Employment
Full-Time

Removed from the employer's board on Nov 9, 2026. First seen by Alion on Aug 30, 2026. CesiumAstro scores A on the Alion truth index.

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CesiumAstro is an American company founded in Austin in 2017 that builds active phased array communications payloads for satellites, aircraft and defence platforms. Its systems are software-defined and electronically steered, which lets a moving platform track several links at once without mechanical antennas, and the company manufactures them in house rather than integrating third-party subsystems. It sells mainly to defence customers and satellite operators, has raised venture funding from investors including Airbus Ventures and Lightspeed, and operates facilities in Austin, Colorado and the United Kingdom.

We are designing, building, and launching 8 new satellites in the next four years. They are BIG and super capable RF payload rideshare SmallSats. Our launches are already secured. Our in-house test facilities are built. Ifyou want to own critical communications for these LEO communications satellites and then have the chance to iterate and improve your design at a rapidly growing tech company, this is your chance.

We’re looking for builders, problem-solvers, and system thinkers. As a Senior Communication Systems Engineer, you will own the design, configuration, and operation of the satellite’s space-to-ground communication links. You will define how the satellite communicates with the ground in both nominal and off-nominal conditions, ensuring reliable command, telemetry, and fault recovery.

The ideal candidate will have a strong background in systems engineering, expertise with both space-based communication payloads and ground terminals, and proven ability to coordinate activities across multidisciplinary engineering teams.

JOB DUTIES AND RESPONSIBILITIES

  • Model, analyze and maintain the satellite’s link budget, modulation and coding, ensuring reliable communications from space to ground for all RF links.
  • Architect hardware-based crypto solutions for flight hardware, manage pass-throughs and end points for users and operations.
  • Strong understanding of ground station and network operations with the ability to troubleshoot issues with commercial providers and on-site terminals.
  • Define how the radios are used in different mission phases, including contingency operations and emergency recovery.
  • Contribute to the RF link test campaign and work with flight software and ground teams to validate end-to-end communication link performance, from antenna to command center.
  • Optimize low-SWaP communications, mitigate interference, and ensure robust, fail-safe links.

WHAT A SUCCESSFUL CANDIDATE LOOKS LIKE

  • You understand how to design, analyze, and operate spaceborne communication links.
  • You can balance power, bandwidth, protocols and noise to ensure reliable space-to-ground connectivity. You can answer “what’s the link budget” with thorough analysis, EbN0, EsN0, or effective data rate given a variety of conditions.
  • Extensive and practical experience with crypto-From COMSEC plan development, key management to system trouble shooting you have applied, on the ground experience.
  • You know how comms fit into the broader mission, from flight software integration to ground operations
  • You are comfortable identifying problems and using your expertise to find solutions.
  • You can prototype, test, and iterate quickly, focusing on what’s needed to get a mission off the ground.

JOB REQUIREMENTS AND MINIMUM QUALIFICATIONS

  • Bachelor’s degree in electrical engineering or a related field
  • A minimum of 5 years of experience with emphasis on satellite communications, RF system engineering, or related fields
  • Experience in design, verification, and operation of satellite communication links
  • Strong understanding of link budget analysis, modulation schemes, and ground station interfaces
  • Hands-on experience configuring and testing ground station equipment and space-qualified radios and antennas
  • Practical understanding of how space links fail, why, and how to fix them before they break
  • Ability to define and implement communication system CONOPS for nominal and emergency operations
  • Experience with satellite communication link licensing and regulatory compliance (ITU/FCC)
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