{"id":1198876,"url":"https://alion.io/job/leidos-senior-software-developer-3","title":"Senior Software Developer","company":{"id":7791,"name":"Leidos","domain":"leidos.com","url":"https://alion.io/company/leidos","size_band":"5000+","is_staffing_agency":false,"employer_type":"services","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"A","score":85,"open_postings":84,"ghost_share":0,"stale_share":0.619,"repost_share":0,"time_to_fill_p50_days":22,"computed_at":"2026-09-28T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Gaithersburg, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":107900,"max":195050,"currency":"USD","period":"year","gross":null,"usd_annual":195050},"salary_estimate":null,"experience_years_min":8,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"C++","optional":false},{"name":"Linux","optional":false},{"name":"Red Hat","optional":false},{"name":"TCP/IP","optional":false},{"name":"Ada","optional":true},{"name":"AI Agents","optional":true},{"name":"CI/CD","optional":true},{"name":"Claude","optional":true},{"name":"OpenAI Codex","optional":true}],"status":"live","first_seen_at":"2026-09-24T19:43:10Z","employer_posted_date":"2026-09-24","last_verified_at":"2026-09-28T20:36:09Z","board_verified":true,"closed_at":null,"days_open":4,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":4},"description":"Leidos is seeking a Senior Software Developer to be based in Gaithersburg, MD; Eagan, MN; or Egg Harbor, NJ. This position will support the United Kingdom National Airspace System Replacement Product Delivery Team - UK NASR PDT. This effort delivers enhanced capabilities to replace and modernize the current operational system supporting UK air traffic services.\nYou will join a dynamic engineering team responsible for building and sustaining real-time, high-availability, safety-critical systems that directly support national airspace operations.\nLocation\nThis is a U.S.-based position that offers a balanced 50% hybrid schedule between 2-3 days in the office per week.\nWhat You’ll Do\nDesign, develop, test, and maintain software for real-time, high-availability systems\nLead software development activities independently and as part of a collaborative engineering team\nAnalyze complex system requirements and translate them into efficient, maintainable software designs\nApply sound software engineering principles to ensure code is reliable, fault tolerant, reusable, and maintainable\nLead and mentor junior developers, influencing technical direction and development processes\nParticipate in Agile ceremonies including daily stand-ups, release planning, and sprint reviews\nDevelop, tune, document, and deploy automation scripts across development, test, and production environments\nPromote code reuse, cross-program collaboration, and sustainable development practices\nSupport system integration activities, including hardware and low-level communications interfaces\nRequired Qualifications\nBachelor’s degree in Computer Science or related field with 8-12years of relevant experienceOR Master’s degree with 6-10 years of relevant experience\n\nAbility to obtain and maintain a Public Trust clearance\nStrong object-oriented programming experience\nProficiency in C and/or C++\nExperience developing real-time, multi-threaded, high-availability systems\nExperience with Linux environments (Red Hat), virtual machines, and hypervisors\nExperience with low-level communications protocols (TCP/IP, UDP, SCTP)\nExperience with hardware or complex system integration\nFamiliarity with system maintenance and lifecycle concepts\nExperience with source control and configuration management tools\nStrong understanding of modern software development principles and best practices\nAbility to plan and prioritize work effectively in a fast-paced environment\nStrong verbal and written communication skills\nDemonstrated ability to work independently and collaboratively\nUS Citizenship Required\nPreferred Qualifications\nExperience with Ada\nExperience with test automation frameworks\nFamiliarity with AI coding tools and agents (Codex, Claude, or similar)\nExperience with Agentic and AI-assisted development workflows, including vibe coding\nFamiliarity with AI-enabled CI/CD, testing, code review, and DevSecOps\nUnderstanding of AI-generated code validation, security, and responsible use\nWhy Leidos\nYou’ll contribute to software systems where reliability, performance, and precision are essential. This is an opportunity to work on mission-critical infrastructure supporting national airspace operations - collaborating with experienced engineers to modernize complex, real-world systems.\nIf you are motivated by solving technically challenging problems in regulated, operational environments, we encourage you to apply.\nIf you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 - and moving faster than anyone else dares.\nOriginal Posting:\nSeptember 24, 2026For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.\nPay Range:\nPay Range $107,900.00 - $195,050.00The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.","description_format":"text","description_chars":4484,"description_truncated":false,"requirements":{"experience_years_min":8,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":true,"languages":[]},"benefits":["Equity"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["National Security","C4ISR","Defense Manufacturing","Engineering Services"],"lifecycle":[{"event":"open","at":"2026-09-24T19:43:10Z"}],"liveness":{"score":61,"band":"ok","label":"Likely open","p_open":1,"p_active":0.615,"p_room":1,"age_days":3,"expected_fill_days":22,"reasons":["conf:5","stale_co","velocity","win:early","comp:brand"],"computed_at":"2026-09-28T05:45:00Z"},"pay":{"stated_usd_annual":195050,"is_top_pay":true},"html_url":"https://alion.io/job/leidos-senior-software-developer-3","json_url":"https://alion.io/job/leidos-senior-software-developer-3.json","meta":{"generated_at":"2026-09-28T22:58:49Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","usage":{"tier":"crawler","counted_by":"address","units_charged":1,"used_today":612,"day_limit":5000,"remaining_today":4388,"minute_limit":60,"resets_at":"2026-09-29T00:00:00Z"}}}