Senior Software Engineer Job Colorado Springs area,Colorado USA,Software Development

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 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 work streams 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 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 Dev Sec Ops tooling such as Docker, Kubernetes, Jenkins, Git Lab, or similar platforms.
Experience with secure software development in defense, aerospace,…