Senior Software Engineer - Fullstack Software

Front Door Defense; Westminster (CO); Hybrid; USD 133,000 - 161,000; Full time

Benefits offered by this job

Stock options

Health benefits

Dental

Vision

HSA

FSA

Life insurance

Disability insurance

Retirement plan

Job summary

CesiumAstro in Westminster, Colorado is seeking a Senior Software Engineer to lead full-stack development for space mission software and modernize ground/flight systems.

You will build modern full-stack applications, integrate legacy components, and own DevSecOps pipelines while collaborating with space system engineers and operators to deliver mission-critical software.

Qualifications

• Bachelor's degree in Software Engineering, Computer Engineering, or relevant field.
• 5+ years of relevant software engineering experience.
• Experience architecting microservices, APIs, message buses, and high-availability systems.
• Experience with space-based or ground mission systems is a plus.
• Experience with cloud services (AWS, Azure, GovCloud).
• Experience with DevSecOps, testing, and secure software practices.
• Proven ability to mentor junior engineers and lead design decisions.

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 using microservices and cloud-native architectures.
• Support on-orbit and ground system integration & test, including emulation and validation.
• Implement DevSecOps pipelines and automated testing.
• Develop modern UI/UX interfaces for operators and analysts.
• Collaborate with space system engineers, mission integrators, and operations teams.

Skills

C++

C#

Rust

Python

Go

AWS

Azure

GovCloud

GitHub

Jira

Confluence

U.S. Citizenship

Education

Bachelor's degree in Software Engineering/Computer Engineering or relevant field

Tools

GitHub

Jira

Confluence

Job description

Senior Software Engineer - Fullstack

Lead development of full-stack space mission software and modernize legacy ground/flight systems

Location: Westminster, Colorado

Compensation: $133,000 - 161,000 USD / year

About The Role

Senior Software Engineer

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.).

$133,000 - $161,000 a year

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. Full-time employment offers include company stock options and a generous benefits package including health, dental, vision, HSA, FSA, life, disability and retirement plans.

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