Senior Software Engineer
Confirmed on the employer's own hiring board on Nov 2, 2026. First seen by Alion on Oct 26, 2026. Twenty-Six Defense scores B on the Alion truth index.
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:
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.