Senior Software Engineer - Fullstack

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 seeking a **Senior Software Engineer** 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. - 5+ years of relevant software engineering experience. - Demonstrated technical leadership across software modernization or distributed systems - Experience architecting microservices, APIs, message buses, and high-availability systems - Expertise integrating and testing software for space-based or ground mission systems - Ability to mentor junior engineers and guide design decisions - Experience with DoD/IC programs, ATO processes, or DevSecOps on classified systems - Experience developing in C++, C#, Rust, Python, or Go. - Experience with SQL/NoSQL database design and integration. - Experience with cloud services (AWS, Azure, or GovCloud variants). - Experience with GitHub, Jira, and Confluence. - 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.).