Senior Software Engineer

• Provide direct technical support to classified HPC R&D users including onboarding and account setup
• Troubleshoot and resolve user access issues in coordination with security and O&M teams
• Support and maintain modeling and simulation workflows written in C, C++, and Fortran
• Write, debug, and maintain Bash and Korn shell scripts to automate user workflows
• Diagnose and resolve technical issues across compute, storage, and networking within the HPC environment
• Maintain accurate and current user-facing technical documentation
• Coordinate with the customer, operations and maintenance staff, and security personnel on user support matters
• Assist users with code maintenance, debugging, and configuration management practices
• Monitor system and user issues to identify recurring problems and recommend improvements
• Communicate technical issues and resolutions clearly to both technical and non-technical stakeholders

• Active TS/SCI clearance with Counterintelligence (CI) Polygraph required
• DOD 8570 IAT Level 2 certification required
• 10+ years of technical experience in software engineering or HPC user support
• Demonstrated experience supporting modeling and simulation workloads
• Hands-on experience with C and C++ in a modeling and simulation context
• Basic to intermediate Linux command line experience required
• Familiarity with HPC environments, job scheduling, and compute cluster operations
• Working knowledge of Fortran, Bash, and Korn shell scripting
• Strong documentation, communication, and cross-team coordination skills

• Comprehensive medical, dental, and vision insurance
• 401(k) retirement plan with employer match
• Paid time off and paid holidays
• Life and disability insurance
• Tuition and professional certification reimbursement
• Relocation assistance available
• On-site access to secure, state-of-the-art HPC facilities
• Career growth opportunities within a mission-critical technical environment
• Health savings and flexible spending account options
• Employee assistance program

Careerscape is recruiting on behalf of our client, a mission-driven defense technology organization, for a Senior Software Engineer to support technical users within a classified High Performance Computing (HPC) research and development environment in Colorado Springs, CO. This is a high-impact role for an experienced engineer who wants to work at the intersection of software engineering, systems administration, and mission-critical modeling and simulation, directly enabling researchers and analysts to get the most out of a demanding classified computing environment. Day to day, you will be the go-to technical resource for HPC users, helping them onboard, resolve access issues, troubleshoot workflows, and maintain the scripts and tools that keep their modeling and simulation work moving. You will spend your time split between hands-on user support, scripting and code maintenance, and coordination with O&M and security teams, so this role suits someone who is equally comfortable debugging a Fortran routine, writing clear documentation, and explaining a technical issue to a non-technical stakeholder. People who thrive here are patient troubleshooters, strong communicators, and genuinely enjoy helping other engineers and scientists succeed.