About the role We are seeking a Senior Software Engineer to lead complex, high-impact software efforts supporting mission-critical programs. This role works across ambiguous technical challenges, defines engineering approaches that others follow, and helps improve reliability, scalability, quality, and delivery performance across teams or program areas. The ideal candidate brings deep software engineering expertise, strong architectural judgment, and the ability to guide complex work in secure, high-performance environments while mentoring other engineers and influencing technical direction. What you'll do Lead complex software workstreams spanning multiple components, services, or engineering teams. Define and drive technical approaches related to architecture, performance, reliability, maintainability, and testability. Develop, enhance, and sustain complex software solutions in support of mission-critical systems. Troubleshoot and resolve high-complexity software issues, integration challenges, and cross-team dependencies. Establish or improve software patterns, standards, and engineering practices that strengthen execution quality. Participate in technical planning, estimation, roadmap development, and continuous improvement efforts. Collaborate with systems engineers, test teams, integration teams, and program stakeholders to support successful execution. Identify technical risks, communicate tradeoffs, and recommend practical mitigation strategies. Provide mentorship and technical guidance to engineers and technical leads across the team. Maintain awareness of customer priorities, program evolution, and technical opportunity areas to support future program needs and organizational growth. Required Qualifications Bachelor’s degree in Computer Science, Software Engineering, Computer Engineering, or a related technical field, or equivalent practical experience. 10+ years of software engineering experience. Experience leading complex technical efforts across multiple components, systems, teams, or program areas. Strong software design and architecture experience in complex, high-performance, embedded, real-time, or mission-critical environments. Proficiency in C++ and/or Python; experience with Java or other relevant languages is a plus. Experience developing in Linux environments. Experience with Git or comparable distributed version control systems. Experience with software debugging, root cause analysis, automated testing, and technical tradeoff analysis. Experience with service integration, APIs, or distributed application behavior where relevant to the environment. Experience working in Agile or iterative development environments. Strong written and verbal communication skills. Active TS/SCI clearance Preferred Qualifications Experience with radar-related processing, signal processing, tracking, sensor fusion, or high-throughput data pipelines. Experience collaborating closely with hardware design teams on software/hardware integration, interface behavior, device-level interaction, or system performance tuning. Experience supporting or presenting at Critical Design Reviews (CDR), design maturity reviews, or technical baseline reviews. Experience with multithreaded development, low-latency systems, or high-performance compute environments. Experience with containerization, orchestration, CI/CD, or DevSecOps tooling such as Docker, Kubernetes, Jenkins, GitLab, or similar platforms. Experience with secure software development in defense, aerospace, ISR, sensor, radar, or other mission-critical environments. Salary: The salary range for this role is $193,700.00 – $262,000.00 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 July 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. 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