
Senior Software Engineer
- 🇺🇸 United States
- On-site
- Senior
- 21 hours ago
- C++
- Unit Testing
- Integration Testing
- Acceptance Testing
- Python
Job Summary:The Senior Software Engineer supports the design, development, integration, and sustainment of software for Active Protection Systems (APS) programs operating in a classified environment. This role contributes across the full software lifecycle, including requirements analysis, software design, implementation in C/C++, integration with hardware and systems, and verification/validation activities. The engineer collaborates with internal teams and external customers to support requirement refinement, prototype development, and delivery of mission‑critical APS capabilities.
Responsibilities and Tasks:Â
- Provides software engineering input to the APS product team through development, testing, and validation activities.
- Develops and maintains C/C++ applications and embedded software for new features, system upgrades, and end‑of‑life replacements.
- Supports interpretation and implementation of internal and external customer application requirements.
- Reviews and becomes familiar with existing codebases, including subcontractor or partner‑developed modules.
- Writes high‑quality, maintainable source code within established deadlines.
- Performs unit testing and integration testing prior to release.
- Troubleshoots reported issues, identifying root causes and implementing corrective actions.
- Identifies, documents, and proposes solutions for software defects.
- Contributes to development and execution of test plans, procedures, and verification reports for qualification and acceptance testing.
- Supports laboratory testing on breadboards, mock‑ups, and system integration test setups.
- Creates and maintains task lists and engineering documentation.
- Assists with system integration, field testing, and system‑level troubleshooting.
- Collaborates closely with systems, hardware, electrical, and test engineering disciplines.
 Education, Experience, License, or Certification:
- Bachelor’s degree in Engineering, Computer Science, or related technical field
- 5 or more years of related experience
- Experience with C/C++ and Python software development
- Candidate must hold or be able to obtain a SECRET security clearance
- Experience in embedded, real‑time, or hardware‑adjacent software environments preferred
- Experience working in classified or defense environments is a plus
- Experience supporting integrated hardware‑software systems beneficial
 Skills and Abilities:
- Proficient in software development processes including requirements, design, implementation, and test.
- Strong understanding of software development lifecycles and structured engineering processes.
- Solid understanding of interactions between software and hardware components.
- Strong written and verbal communication skills.
- Ability to work effectively in a classified environment following security procedures.
 Travel/Physical Requirements:
- Required (approximately 15%), including international travel.
Senior Software Engineer · Twenty-Six Defense