Software Engineer II - Fullstack

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 seeking a Software Engineer II to support several new, space-centric programs across the DoW and IC. We are looking for engineers who thrive in a fast-paced startup environment and enjoy solving hard problems. Our culture is simple: work hard, solve real problems, build things that matter.

JOB DUTIES AND RESPONSIBILITIES

• Build modern full-stack applications in support of space mission systems.
• Integrate and modernize legacy space-related ground and flight software.
• Develop distributed applications leveraging microservices, cloud-native architectures, and Distributed Ledger Technology (DLT)/consensus frameworks.
• Support on-orbit and ground system integration & test, including emulation, simulation, and interface validation.
• Implement DevSecOps pipelines, automated testing, and secure software practices.
• Develop modern UI/UX interfaces for mission operators and analysts.
• Work closely with space system engineers, mission integrators, and operations teams.
• Contribute to a mission-focused engineering culture where your ideas truly shape the product.

JOB REQUIREMENTS AND MINIMUM QUALIFICATIONS

• Bachelor's degree in Software Engineering, Computer Engineering, or relevant field.
• 2+ years of relevant software engineering experience.
• Foundation in object-oriented or systems programming (C++, Rust, C#, etc.)
• Familiarity with containerization (Docker), REST APIs, or microservices
• Exposure to embedded development or cloud development is a plus
• Strong desire to learn space-domain systems, DLT, DevSecOps, and distributed architectures
• U.S. Citizenship is required for this position along with the ability to obtain a Secret security clearance.
• Ability to travel up to 10%.

PREFERRED EXPERIENCE

• Existing security clearance (TS/SCI preferred).
• Experience supporting DoD/IC programs.
• Experience building software for spacecraft, OPS software, or flight/ground segment integration.
• Experience with high-performance computing, distributed processing, or real-time systems.
• Experience with performance tuning and resource-constrained environments.
• Experience with DevSecOps, IaC, and automated test frameworks.
• Familiarity with DLT, blockchain, or consensus protocols.
• Experience with modern UI/UX frameworks (React, Vue, Svelte, Blazor, etc.).