{"id":2102481,"url":"https://alion.io/job/systems-and-technology-research-principal-software-engineer","title":"Principal Software Engineer","company":{"id":5401,"name":"Systems and Technology Research","domain":"str.us","url":"https://alion.io/company/str","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"A","score":96,"open_postings":44,"ghost_share":0,"stale_share":0.159,"repost_share":0,"time_to_fill_p50_days":53,"computed_at":"2026-10-10T05:45:15Z"}},"role":"Backend","role_family":"Backend","seniority":"lead","employment_type":null,"work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":[],"countries":[],"hiring_countries":["US"],"hiring_countries_total":1,"salary":{"min":220000,"max":260000,"currency":"USD","period":"year","gross":null,"usd_annual":260000},"salary_estimate":null,"experience_years_min":10,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"Git","optional":false},{"name":"Linux","optional":false},{"name":"MATLAB","optional":false},{"name":"Python","optional":false}],"status":"live","first_seen_at":"2026-10-08T18:51:02Z","employer_posted_date":"2026-10-08","last_verified_at":"2026-10-11T21:42:25Z","board_verified":true,"closed_at":null,"days_open":3,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":3},"description":"About the Team:\nThe Real-time Architectures, Integration, and Demonstration (RAID) Group focuses on transition of algorithms from concept to real-time software, providing open architecture expertise, and facilitating integration of capabilities for experimentation, test, and deployment.\nThe Role:\nAs a Principal Software Engineer you will provide technical leadership for the development, integration, and validation of real-time RF sensor software systems. You will work as part of a multi-disciplinary team to architect, guide, and implement software components, integrate algorithms into open architecture frameworks, and develop test infrastructure to validate system performance. This role emphasizes hands-on software development, open system integration, integrating software components across distributed architectures and with hardware platforms, and rigorous testing of real-time applications. You will establish integration and test approaches, identify and mitigate technical risks, mentor engineers, and collaborate with program leadership and government customers to ensure successful delivery of mission-critical capabilities.\nWhat you will do:\nLead the technical design, development, integration, and validation of real-time sensor systems in C/C++\nIntegrate signal processing algorithms into open architecture software frameworks\nDefine, develop, and execute integration tests and system-level validation tests\nDebug software issues in real-time, multi-threaded, and distributed systems\nLead the transition of algorithm specifications and MATLAB/Python prototypes into optimized production C/C++ implementations\nDocument software designs, test procedures, results, and technical reports as well as integration plans, technical briefings, and customer-facing presentations\nSupport system demonstrations and field-testing activities\nEstablish and promote best practices for software quality, configuration management, test automation, documentation, and technical risk management\nMentor and provide technical guidance to junior and mid-level engineers\nInterface with government sponsors, customers, program managers, and technical stakeholders to define requirements, communicate technical status, and present results\nLead or substantially contribute to proposal development, including technical approach development, work-breakdown planning, technical writing, cost estimation, white papers, and customer presentations\nContribute to the design and implementation of user interfaces, dashboards, and visualization tools that support system observability, test execution, data analysis, and integration workflows\nSupport approximately 10% travel for integration events, field testing, and customer demonstrations\nWho you are:\nActive clearance at the Secret level with ability to obtain and maintain a Top Secret security clearance, for which U.S. citizenship is a government requirement\nBS, MS, or PhD in Computer Science, Computer Engineering, Electrical Engineering, or a related field with relevant experience depending on degree (BS + 12 years, MS + 10 years, or PhD + 5 years)\nTen or more years of professional software development experience, including demonstrated experience leading complex software development, integration, and test efforts\nExpert-level proficiency in programming for high-performance, real-time applications\nExperience with version control systems (Git)\nExperience with Linux\nStrong debugging and troubleshooting skills\nDemonstrated experience developing or integrating real-time software for signal-processing, embedded, distributed, or hardware-connected systems\nDemonstrated technical leadership and mentoring experience\nExperience leading or substantially contributing to proposal efforts, including technical writing, technical-approach development, cost estimation, and customer presentations\nEven Better:\nActive Top Secret clearance (TS/SCI preferred)\nStrong written, verbal, and presentation skills, including the ability to communicate technical concepts to engineers, program leadership, and government customers\nProficiency in Python or MATLAB\nExperience with hands-on hardware testing and lab equipment\nExperience in signal processing and RF sensor-system architectures\nExperience with real-time or embedded software development\nKnowledge of multithreaded programming and synchronization\nUnderstanding of open architecture principles and standards\nExperience developing user interfaces, dashboards, or visualization tools for system integration, test execution, operational monitoring, or data analysis\nAwareness of usability and human-machine-interface considerations for technical, engineering, or mission-system applications\nJoin us and be part of a team that's making an impact at the forefront of technology and innovation.\nPay Information\nFull-Time Salary Range: $220,000 - $260,000\nThe salary range listed is based on external market data. Offers are based on factors, such as but not limited to, the candidate’s experience, education, training, key skills/critical skills, security clearances, and prevailing market and business conditions.\nSTR is a growing technology company with locations near Boston, MA, Arlington, VA, near Dayton, OH, Melbourne, FL, Carlsbad, CA, Atlanta, GA, and Denver, CO. We specialize in advanced research and development for defense, intelligence, and national security in: cyber; next generation sensors, radar, sonar, communications, and electronic warfare; and artificial intelligence algorithms and analytics to make sense of the complexity that is exploding around us.\nSTR is committed to creating a collaborative learning environment that supports deep technical understanding and recognizes the contributions and achievements of all team members. Our work is challenging, and we go home at night knowing that we pushed the envelope of technology and made the world safer.\nSTR is not just any company. Our people, culture, and attitude along with their unique set of skills, experiences, and perspectives put us on a trajectory to change the world. We can't do it alone, though - we need fellow trailblazers. If you are one, join our team and help to keep our society safe! Visit us at www.str.us for more info.\n\nSTR is an equal opportunity employer. We are fully dedicated to hiring the most qualified candidate regardless of race, color, religion, sex (including gender identity, sexual orientation and pregnancy), marital status, national origin, age, veteran status, disability, genetic information or any other characteristic protected by federal, state or local laws.\nIf you need a reasonable accommodation for any portion of the employment process, email us at  and provide your contact info.\nPursuant to applicable federal law and regulations, positions at STR require employees to obtain national security clearances and satisfy the requirements for compliance with export control and other applicable laws.","description_format":"text","description_chars":6930,"description_truncated":false,"requirements":{"experience_years_min":10,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":true,"languages":[]},"benefits":[],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["C4ISR","Cyber Warfare","Defense AI"],"lifecycle":[{"event":"open","at":"2026-10-08T19:06:12Z"}],"visa":[],"liveness":{"score":90,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.903,"p_room":1,"age_days":1,"expected_fill_days":53,"reasons":["conf:1","velocity","win:early","comp:brand"],"computed_at":"2026-10-10T05:45:15Z"},"pay":{"stated_usd_annual":260000,"is_top_pay":true},"html_url":"https://alion.io/job/systems-and-technology-research-principal-software-engineer","json_url":"https://alion.io/job/systems-and-technology-research-principal-software-engineer.json","meta":{"generated_at":"2026-10-11T23:40:45Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":14833,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-12T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":5401},"rest":"https://alion.io/mcp/rest/get_company?id=5401"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fsystems-and-technology-research-principal-software-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fsystems-and-technology-research-principal-software-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fsystems-and-technology-research-principal-software-engineer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/systems-and-technology-research-principal-software-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fsystems-and-technology-research-principal-software-engineer"}]}