{"id":3220647,"url":"https://alion.io/job/sierra-nevada-corporation-principal-software-engineer-architecturedesign-development","title":"Principal Software Engineer (Architecture/Design Development)","company":{"id":98067,"name":"Sierra Nevada Corporation","domain":"sncorp.com","url":"https://alion.io/company/sierra-nevada-corporation","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"B","score":82,"open_postings":88,"ghost_share":0,"stale_share":0.705,"repost_share":0.011,"time_to_fill_p50_days":33,"computed_at":"2026-10-27T05:46:45Z"}},"role":"Backend","role_family":"Backend","seniority":"lead","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Plano, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":124000,"max_usd":248000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":1231},"experience_years_min":14,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"C#","optional":false},{"name":"C++","optional":false},{"name":"Java","optional":false},{"name":"Machine Learning","optional":false},{"name":"Python","optional":false},{"name":"RTOS","optional":false},{"name":"Scrum","optional":false},{"name":"Waterfall","optional":false}],"status":"live","first_seen_at":"2026-10-23T00:00:00Z","employer_posted_date":"2026-10-23","last_verified_at":"2026-10-27T03:02:07Z","board_verified":true,"closed_at":null,"days_open":5,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":5},"description":"Do you enjoy developing new products and services? Join us! Our Software Engineers work in an agile, collective environment. As a Principal Software Engineer, you will provide technical leadership and strategic direction for the development and optimization of advanced software systems for aerospace applications. You will lead major projects, mentor engineering teams, and drive innovation to achieve superior software performance.The ISR (Intelligence, Surveillance & Reconnaissance), Aviation, and Security (IAS) business area is a leader in ISR and aviation, it is a leading prime manned and unmanned aircraft systems integrator for innovative, high-performance ISR and aviation systems. Its end-to-end Command, Control, Computers, Communications and Intelligence, Surveillance & Reconnaissance (C4ISR) capabilities encompass design, integration, test, certification, ground/flight training and complete logistics support. IAS tailors solutions to customer cost, performance, and schedule requirements and designs to consistently exceed expectations - with an unrivaled record of on time and on (or under) budget deliveries.Responsibilities:\nProvide technical leadership and direction for the development of advanced software systems.\nCollaborate with cross-functional teams to ensure software meets performance, quality, and regulatory standards.\nLead the creation and maintenance of detailed software documentation, including design specifications and user manuals.\nMentor and guide engineering teams on technical best practices and innovation.\nConduct high-level code reviews and provide strategic feedback.\nDefine and implement software requirements and specifications in collaboration with stakeholders.\nDrive major continuous improvement initiatives to enhance software performance and reliability.\nRepresent the software engineering function in high-level strategic meetings and decision-making processes.\nQualifications You Must Have:\nBachelor's degree in Computer Science, Software Engineering, or related field; Master's degree preferred.\n14+ years of experience in experience in software development.\nHigher level relevant degree may substitute for experience.\nExpert proficiency in programming languages such as C++, Java, or Python.\nExtensive leadership experience in software development.\nDemonstrated knowledge of engineering principles and practices.\nExperience working in multi-disciplinary teams.\nApply extensive expertise in software and equipment architecture/design development, technical monitoring, and lifecycle management.\nAn active Secret with the eligibility to obtain a Top Secret / Top Secret with SCI eligibility U.S. Security Clearance is required.\nQualifications We Prefer:\nExpertise in advanced software technologies (e.g., AI, machine learning, cloud computing).\nExperience with real-time operating systems (RTOS) and embedded systems.\nSignificant experience in the Aerospace and Defense industry.\nUnderstanding of industry standard software languages such as C, C#, C++, HTML, Java, Python, and Bash.\nExperience with software tools for requirements tracking, code reviews, static analysis, library and artifact repository, and automated build.\nKnowledge of software development methodologies such as Agile/Scrum, Waterfall, and Spiral.\nProficient with data structures.\nExperience using the Open Mission System messaging protocol and Universal Command and Control Interface standards.\nExperience supporting mission system architectures and capabilities\nExperience applying systems engineering principles to software-based solutions.\nSolid Understanding of various Air Frames, Air Vehicle sub-systems and general operation a plus.\nEssential Functions:\nAbility to work on a computer for extended periods.\nHand/finger dexterity for coding and testing.\nAbility to work in a hybrid environment with occasional travel.\nThis posting will be open for application for a minimum of 5 days and may be extended based on business needs.\nSNC offers annual incentive pay based upon performance that is commensurate with the level of the position.\nSNC offers a generous benefit package, including medical, dental, and vision plans, 401(k) with 150% match up to 6%, life insurance, 3 weeks paid time off, tuition reimbursement, and more.\nIMPORTANT NOTICE:\nThis position requires current/active Top Secret with SCI eligibility U.S. Security Clearance. U.S. Citizenship status is required as this position needs an active U.S. Security Clearance for employment. Non-U.S. Citizens may not be eligible to obtain a security clearance. The Department of Defense Consolidated Adjudications Facility (DoD CAF), a federal government agency, handles the adjudicative aspects of the security clearance eligibility process for industry applicants. Adjudicative factors which affect the outcome of the eligibility determination include, but are not limited to, allegiance to the U.S., foreign influence, foreign preference, criminal conduct, security violations and illegal drug use.Learn more about the background check process for Security Clearances.\nSNC is a global leader in aerospace and national security committed to moving the American Dream forward. We’re known and respected for our mission and execution focus, agility, and disruptive and rapid innovation. We provide leading edge technologies and transformative solutions that support our nation’s most critical security needs. If you are mission-focused, thrive in collaborative environments, and want to make our country stronger with state-of-the-art technologies that safeguard freedom, join our team!\nSNC is an Equal Opportunity Employer committed to an environment free of discrimination. 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