About Four Sea Group, Inc.

Four Sea Group is a 100% employee-owned technical mission support company based in Denver, Colorado. Founded by an aerospace industry veteran and PhD astrophysicist, we support complex defense, space, software, systems, and mission-focused programs for government and industry partners. What sets FSG apart is the caliber of our people and the way we operate: we are a reputation-driven team of highly skilled engineers and technical experts who are brought in for their depth, judgment, and ability to solve difficult problems. As an employee-owned company, we have built our compensation, benefits, and culture around a simple idea: when the company succeeds, that value should go back to the people doing the work.

About the role

We are seeking a Senior Software Engineer – Command & Control to support the design, development, integration, and sustainment of software solutions in a secure mission environment. This role is best suited for a strong software engineer who can lead delivery within a defined technical scope, resolve cross-team software issues, and support reliable execution across integrated development efforts.

The ideal candidate brings solid software engineering fundamentals, practical technical judgment, and the ability to work independently while collaborating effectively across software, systems, integration, and test teams in a high-consequence environment.

What you'll do

• Design, develop, enhance, and maintain complex software applications, services, and components.
• Lead delivery of larger features or technical workstreams through implementation, testing, integration, and sustainment.
• Translate software requirements into effective, maintainable technical solutions within assigned scope.
• Set implementation approach within assigned work with attention to performance, reliability, maintainability, and testability.
• Troubleshoot, debug, and resolve software defects and cross-team technical issues that affect execution or integration.
• Participate in design reviews, code reviews, technical planning, and continuous improvement efforts.
• Collaborate with systems engineers, integration teams, testers, and program stakeholders to support aligned execution and successful delivery.
• Identify technical risks, communicate tradeoffs, and recommend practical mitigation strategies.
• Provide peer guidance and help reinforce strong engineering practices across the team.
• Support software quality through disciplined development, testing, documentation, and structured delivery practices.

Required Qualifications

• Bachelor’s degree in Computer Science, Software Engineering, Computer Engineering, or a related technical field, or equivalent practical experience.
• 6+ years of relevant software engineering experience in technical or mission-driven environments.
• Active TS/SCI Security Clearance
• Experience in command-and-control (C2) software environments.
• Experience with C++ development.
• Experience with Python development or scripting.
• Experience supporting software development, integration, or sustainment in a structured engineering environment.
• Experience working in Agile software development environments.
• Ability to work independently within assigned scope and contribute to reliable delivery across software efforts.
• Strong written and verbal communication skills.

Preferred Qualifications

• Experience with SNMP and networked systems environments.
• Experience working with Cisco switches or comparable network infrastructure.
• Active CI Polygraph.
• Security+ certification or comparable security certification.
• Experience with automated testing frameworks such as Robot Framework or Behave.
• Experience supporting GitLab CI/CD pipelines or similar continuous integration and deployment workflows.
• Experience with operational or mission management platforms such as XMS, MCS, ECS, COPS, or similar environments.
• Experience working across software integration, automated testing, and release workflows in classified environments.

Salary: The salary range for this role is $151,700-$205,200 per year. The salary range provided is a good faith estimate representative of all experience levels. Four Sea Group, Inc. considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, key skills, and market conditions.   

Application Deadline: This position is expected to remain open through August 31, 2026. The company may adjust this deadline based on business needs and will update the posting as appropriate.

Benefits: FSG is 100% ESOP-owned, which means our employees share directly in the company’s growth. We offer competitive compensation, a strong employer-funded retirement plan, generous PTO and flexible time-off options, comprehensive health, dental, vision, life, short-term disability, and long-term disability benefits, plus a generous medical stipend that gives employees more choice and flexibility. Our model is intentionally built to keep more value with employees through salary, retirement, benefits, and ownership. You will work alongside experienced engineers and technical leaders on meaningful defense, space, software, systems, and mission support work, with room to grow as a technical expert, mentor, program contributor, or future leader.
  
EEO Statement: Four Sea Group is an equal opportunity employer and considers qualified applicants for employment without regard to race, color, sex, sexual orientation, gender identity or expression, religion, national origin, marital or familial status, age, disability, veteran status, military service or application for military service.