Principal Flight Software Engineer

Company Details


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 Senior Flight Software Engineer to our Internal Missions team. If you are great at what you do, enjoy working in a startup environment, and are passionate about developing space software for leading-edge communications satellites, we would like to hear from you.

In this position, you will be responsible for the Cesium spacecraft flight software and software-in-the-loop testing through all stages of the development process. Your work will include software to monitor, test, and control spacecraft subsystems such as attitude, command and data handling, navigation, thermal, and power. The ideal candidate will be n experience spacecraft software engineer, motivated to develop every aspect of space mission software. You will work and learn from a cohort of senior and principal software engineers. You will use your experience to direct, mentor, and grow a team of motivated spacecraft engineers in the development of a new satellite system.

As a Cesium spacecraft team member, you will work on a small team to develop satellites and put them in orbit. You will be responsible for software design to include initial architecture and block diagrams, requirements definition, implementation, code review, and validation and verification. You will need to identify simplifying solutions to simulate complex problems and explain key results and decisions to the team.

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.


  • Master of Science (MS), or Doctorate (Ph.D.) degree in Software or Computer Engineering from an accredited university or institution
  • Minimum of 8 years of industry experience in spacecraft software development
  • A strong understanding of space missions from conception through flight and disposal
  • Experience with C, C++, Python, or other languages in an aerospace context
  • Familiarity with spacecraft mission design including events, pointing modes, maneuver planning, and operations
  • Experience with multiple mission software architectures which drives your vision for the next generation of space software
  • Experience with spacecraft failure in post-CDR testing and on-orbit, root cause analysis, and recovery
  • Experience with design for reliability, spaceflight redundancy, and fault detection, identification, and recovery
  • Familiarity with systems for continuous integration, test, and delivery
  • Space software experience with attitude dynamics, coordinate frame transformations, vector mathematics, radiative heat transfer, spacecraft propulsion, space communication systems, and power systems
  • Familiarity with spacecraft mission design including events, pointing modes, maneuver planning, and operations
  • Experience with communication protocols such as TCP/IP for use in software-in-the-loop and hardware-in-the-loop lab development and for use in space flight
  • Embedded software experience, particularly for space missions
  • Ability to implement physical first principles as scripts or spreadsheets
  • Experience with processes for software release, revisioning, and configuration
  • Familiarity with configuration management tools, defect tracking tools, and peer review
  • Experience with trades and processes for handling radiation tolerance in software on automotive grade parts
  • Excellent written and verbal communication skills

Preferred experience includes:

  • CubeSat and SmallSat experience including LEO, MEO, GEO, and beyond
  • Hands-on experience with spacecraft instrumentation, subsystems, and test labs
  • Experience with JPL F’, NASA cFS, and other commercial space software frameworks
  • Experience with ground system software engineering for space missions
  • Experience in a team leadership role on a space software program
  • Experience in other non-space safety critical software programs

The salary range for this role is $70,000 to $150,000; however, 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. We also provide generous benefits and stock option packages to all our employees.

CesiumAstro is proud to be an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, gender identity, national origin, age, protected veteran status, or disability status.

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Tagged as: MEO, jpl f’, nasa cfs, GEO, LEO

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