{"question":"Leidos backend engineering jobs","answer":"Leidos has 116 open backend engineering roles: 14 in Chantilly, 12 in Bethesda and 11 in Fort Meade. 105 of them state the pay; the middle half sits between $122k and $184k a year. 7 were posted in the last 7 days. Roles at Leidos take 27 days to fill at the median.","company":"Leidos","company_url":"https://alion.io/company/leidos","team":"Backend engineering","open_roles":116,"new_7_days":7,"fully_remote":1,"median_days_to_fill":27,"stated_pay_usd":{"p25":122275,"median":151475,"p75":184325,"postings":105},"cities":{"Chantilly":14,"Bethesda":12,"Fort Meade":11,"Huntsville":9,"Columbia":7,"Annapolis Junction":7,"Saint Louis":7,"Canberra":5,"Tucson":5,"Clarksburg":4,"Arlington":4,"Melbourne":4,"Ashburn":4,"Gaithersburg":3,"San Diego":3,"Englewood":3,"Reston":2,"Hanover":2,"Tampa":2,"Eagan":2},"roles":[{"title":"Software Developer","url":"https://alion.io/job/leidos-software-developer-12","cities":["Salt Lake City"],"work_mode":"Hybrid","pay_usd":[87100,157450],"posted":"2026-10-15"},{"title":"Principal Software Tool Developer","url":"https://alion.io/job/leidos-principal-software-tool-developer","cities":["Fort Meade"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-10-15"},{"title":"Senior Software Tool Developer","url":"https://alion.io/job/leidos-senior-software-tool-developer","cities":["Fort Meade"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-10-15"},{"title":"Junior Software Engineer","url":"https://alion.io/job/leidos-junior-software-engineer-8","cities":["Tucson","Saint Louis","Englewood","Chantilly"],"work_mode":"On-site","pay_usd":[69550,125725],"posted":"2026-10-15"},{"title":"Senior Java Software Engineer - 25k Sign On Bonus","url":"https://alion.io/job/leidos-senior-java-software-engineer-25k-sign-on-bonus","cities":["Annapolis Junction"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-10-14"},{"title":"Full Stack Software Developer Technical Lead","url":"https://alion.io/job/leidos-full-stack-software-developer-technical-lead","cities":["Ashburn"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-10-14"},{"title":"Database Admin/Engineer Data Librarian","url":"https://alion.io/job/leidos-database-adminengineer-data-librarian","cities":["Saint Louis"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-10-14"},{"title":"Senior Software Defined Radio (SDR) Engineer","url":"https://alion.io/job/leidos-senior-software-defined-radio-sdr-engineer-2","cities":["Arlington"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-10-13"},{"title":"Junior Software Developer","url":"https://alion.io/job/leidos-junior-software-developer-2","cities":["Huntsville"],"work_mode":"On-site","pay_usd":[57850,104575],"posted":"2026-10-13"},{"title":"Principal Hardware Software Engineer","url":"https://alion.io/job/leidos-principal-hardware-software-engineer","cities":["Annapolis Junction"],"work_mode":"On-site","pay_usd":[154050,278475],"posted":"2026-10-09"},{"title":"Principal Software Engineer - 25k Sign on Bonus","url":"https://alion.io/job/leidos-principal-software-engineer-25k-sign-on-bonus","cities":["Annapolis Junction"],"work_mode":"On-site","pay_usd":[154050,278475],"posted":"2026-10-09"},{"title":"Software Engineer Expert","url":"https://alion.io/job/leidos-software-engineer-expert-2","cities":["Chantilly"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-10-08"},{"title":"Systems, Integration and Software Engineer Intern","url":"https://alion.io/job/leidos-systems-integration-and-software-engineer-intern","cities":["Atlantic City"],"work_mode":"On-site","pay_usd":[48100,86950],"posted":"2026-10-08"},{"title":"Software Engineer (Learning Management System – Mid-Level)","url":"https://alion.io/job/leidos-software-engineer-learning-management-system-mid-level","cities":["Bethesda"],"work_mode":"On-site","pay_usd":[69550,125725],"posted":"2026-10-08"},{"title":"Software Application Developer","url":"https://alion.io/job/leidos-software-application-developer-3","cities":["Reston"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-10-08"},{"title":"Defensive Exploit Software Developer","url":"https://alion.io/job/leidos-defensive-exploit-software-developer","cities":["Lawton"],"work_mode":"On-site","pay_usd":[57850,104575],"posted":"2026-10-07"},{"title":"Software Engineer | 4-month contract","url":"https://alion.io/job/leidos-software-engineer-4-month-contract","cities":["Melbourne","Canberra"],"work_mode":"On-site","pay_usd":null,"posted":"2026-10-06"},{"title":"Lead Software Engineer","url":"https://alion.io/job/leidos-lead-software-engineer-6","cities":["Albuquerque"],"work_mode":"On-site","pay_usd":[87100,157450],"posted":"2026-10-02"},{"title":"Cloud Systems Engineer","url":"https://alion.io/job/leidos-cloud-systems-engineer","cities":["Suitland"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-10-01"},{"title":"Full Stack Developer & Automation Specialist","url":"https://alion.io/job/leidos-full-stack-developer-automation-specialist","cities":["Atlanta"],"work_mode":"On-site","pay_usd":[87100,157450],"posted":"2026-10-01"},{"title":"Principal Software Developer","url":"https://alion.io/job/leidos-principal-software-developer","cities":["Gaithersburg"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-09-30"},{"title":"Software Engineering Lead","url":"https://alion.io/job/leidos-software-engineering-lead","cities":["Rockville"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-09-30"},{"title":"Software Engineer - Kinetic Effects","url":"https://alion.io/job/leidos-software-engineer-kinetic-effects-2","cities":["Huntsville"],"work_mode":"On-site","pay_usd":[87100,157450],"posted":"2026-09-28"},{"title":"Software Reverse Engineer","url":"https://alion.io/job/leidos-software-reverse-engineer","cities":["Columbia"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-09-24"},{"title":"Junior Software Developer","url":"https://alion.io/job/leidos-junior-software-developer","cities":["Huntsville"],"work_mode":"On-site","pay_usd":[69550,125725],"posted":"2026-09-24"},{"title":"Jr. Software Engineer","url":"https://alion.io/job/leidos-jr-software-engineer","cities":["Bethesda"],"work_mode":"On-site","pay_usd":[57850,104575],"posted":"2026-09-24"},{"title":"Lead Software Engineer – AI-Assisted Development","url":"https://alion.io/job/leidos-lead-software-engineer-ai-assisted-development","cities":["Huntsville"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-09-23"},{"title":"Lead Software Engineer, Data & DevSecOps","url":"https://alion.io/job/leidos-lead-software-engineer-data-devsecops-2","cities":["Arlington"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-09-21"},{"title":"Jr. Software Engineer Intern","url":"https://alion.io/job/leidos-jr-software-engineer-intern","cities":["Tucson"],"work_mode":"On-site","pay_usd":[48100,86950],"posted":"2026-09-21"},{"title":"Software Engineer","url":"https://alion.io/job/leidos-software-engineer-24","cities":["Melbourne"],"work_mode":"On-site","pay_usd":null,"posted":"2026-09-18"},{"title":"Sr. Software Architect","url":"https://alion.io/job/leidos-sr-software-architect-2","cities":["San Diego"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-09-17"},{"title":"Senior Software Engineer","url":"https://alion.io/job/leidos-senior-software-engineer-11","cities":["Canberra"],"work_mode":"On-site","pay_usd":null,"posted":"2026-09-17"},{"title":"Software Engineer Expert","url":"https://alion.io/job/leidos-software-engineer-expert-3","cities":["Chantilly"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-09-17"},{"title":"Oracle Software Engineer","url":"https://alion.io/job/leidos-oracle-software-engineer-2","cities":["Oklahoma City"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-09-16"},{"title":"Principal Full-Stack Developer","url":"https://alion.io/job/leidos-principal-full-stack-developer","cities":["Fort Meade"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-09-16"},{"title":"Full Stack Developer","url":"https://alion.io/job/leidos-full-stack-developer-3","cities":["Arlington"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-09-15"},{"title":"Full Stack Developer - with AI","url":"https://alion.io/job/leidos-full-stack-developer-with-ai-2","cities":["Ashburn"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-09-15"},{"title":"Full Stack Developer with AI","url":"https://alion.io/job/leidos-full-stack-developer-with-ai-3","cities":["Ashburn"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-09-15"},{"title":"Modeling and Simulation Software Engineer","url":"https://alion.io/job/leidos-modeling-and-simulation-software-engineer","cities":["Beavercreek"],"work_mode":"On-site","pay_usd":[69550,125725],"posted":"2026-09-14"},{"title":"Software Engineer (SWE-2)","url":"https://alion.io/job/leidos-software-engineer-swe-2-2","cities":["Fort Meade"],"work_mode":"On-site","pay_usd":[87100,157450],"posted":"2026-09-11"},{"title":"Software Engineer SME","url":"https://alion.io/job/leidos-software-engineer-sme-2","cities":["Tucson","Saint Louis","Englewood","Chantilly"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-09-10"},{"title":"Mid-Level Software Engineer","url":"https://alion.io/job/leidos-mid-level-software-engineer","cities":["Tucson","Saint Louis","Englewood","Chantilly"],"work_mode":"On-site","pay_usd":[87100,157450],"posted":"2026-09-08"},{"title":"Modeling and Simulation Lead Software Engineer","url":"https://alion.io/job/leidos-modeling-and-simulation-lead-software-engineer","cities":["Beavercreek"],"work_mode":"On-site","pay_usd":[87100,157450],"posted":"2026-09-08"},{"title":"Principal Biometrics Software Engineer","url":"https://alion.io/job/leidos-principal-biometrics-software-engineer","cities":["Bethesda"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-09-03"},{"title":"Senior Full Stack Application Developer","url":"https://alion.io/job/leidos-senior-full-stack-application-developer-2","cities":["Tampa"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-09-02"},{"title":"Algorithm Software Engineer","url":"https://alion.io/job/leidos-algorithm-software-engineer","cities":["San Diego"],"work_mode":"On-site","pay_usd":[140000,220000],"posted":"2026-09-01"},{"title":"Senior Python Developer","url":"https://alion.io/job/leidos-senior-python-developer","cities":["Columbia","Chantilly"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-08-31"},{"title":"Software Developer II","url":"https://alion.io/job/vuejobs-software-developer-ii","cities":["Huntsville"],"work_mode":"On-site","pay_usd":[69550,125725],"posted":"2026-08-31"},{"title":"Software Engineer/Data Science Librarian","url":"https://alion.io/job/leidos-software-engineerdata-science-librarian","cities":["Saint Louis"],"work_mode":"On-site","pay_usd":null,"posted":"2026-08-28"},{"title":"Senior Software Integration Engineer","url":"https://alion.io/job/leidos-senior-software-integration-engineer","cities":["Chantilly"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-08-28"},{"title":"Mid-Level Backend Software Engineer","url":"https://alion.io/job/leidos-mid-level-backend-software-engineer-3","cities":["Tucson","Saint Louis","Chantilly"],"work_mode":"On-site","pay_usd":[87100,157450],"posted":"2026-08-28"},{"title":"Junior Software Engineer","url":"https://alion.io/job/leidos-junior-software-engineer-4","cities":["Laurel"],"work_mode":"On-site","pay_usd":[57850,104575],"posted":"2026-08-28"},{"title":"Lead Software Developer","url":"https://alion.io/job/leidos-lead-software-developer","cities":["Egg Harbor Township"],"work_mode":"Hybrid","pay_usd":[87100,157450],"posted":"2026-08-27"},{"title":"Software Developer","url":"https://alion.io/job/leidos-software-developer","cities":["Egg Harbor Township"],"work_mode":"Hybrid","pay_usd":[69550,125725],"posted":"2026-08-27"},{"title":"Sr. Software Engineer TS/SCI Polygraph HANOVER","url":"https://alion.io/job/leidos-sr-software-engineer-tssci-polygraph-hanover","cities":["Hanover"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-08-27"},{"title":"Software Engineer – Mid-Career","url":"https://alion.io/job/leidos-software-engineer-mid-career","cities":["San Diego"],"work_mode":"On-site","pay_usd":null,"posted":"2026-08-26"},{"title":"Principal Software Engineer","url":"https://alion.io/job/leidos-principal-software-engineer-3","cities":["Laurel"],"work_mode":"On-site","pay_usd":[154050,278475],"posted":"2026-08-26"},{"title":"Aviation Software Engineer","url":"https://alion.io/job/leidos-aviation-software-engineer","cities":["Huntsville"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-08-26"},{"title":"Software Development Lead","url":"https://alion.io/job/leidos-software-development-lead","cities":["Eagan"],"work_mode":"On-site","pay_usd":[87100,157450],"posted":"2026-08-25"},{"title":"Electronic Warfare Software Engineer","url":"https://alion.io/job/leidos-electronic-warfare-software-engineer","cities":["Huntsville"],"work_mode":"On-site","pay_usd":null,"posted":"2026-08-25"},{"title":"Software Developer","url":"https://alion.io/job/leidos-software-developer-9","cities":["Eagan"],"work_mode":"Hybrid","pay_usd":[69550,125725],"posted":"2026-08-25"},{"title":"Senior Java Software Developer","url":"https://alion.io/job/leidos-senior-java-software-developer","cities":["Clarksburg"],"work_mode":"On-site","pay_usd":[87100,157450],"posted":"2026-08-21"},{"title":"Master Software Engineer","url":"https://alion.io/job/leidos-master-software-engineer","cities":["Clarksburg"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-08-21"},{"title":"Software Integration Engineer","url":"https://alion.io/job/leidos-software-integration-engineer","cities":["Chantilly"],"work_mode":"On-site","pay_usd":[69550,125725],"posted":"2026-08-20"},{"title":"Autonomous Simulation Software Engineer","url":"https://alion.io/job/leidos-autonomous-simulation-software-engineer","cities":["Lynnwood"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-08-19"},{"title":"Sr. Software Engineer","url":"https://alion.io/job/leidos-sr-software-engineer-2","cities":[],"work_mode":"Remote","pay_usd":[107900,195050],"posted":"2026-08-19"},{"title":"Software Engineer 25k Sign on Bonus!","url":"https://alion.io/job/leidos-software-engineer-25k-sign-on-bonus","cities":["Columbia"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-08-14"},{"title":"Journeyman Full Stack Developer","url":"https://alion.io/job/leidos-journeyman-full-stack-developer","cities":["Saint Louis"],"work_mode":"On-site","pay_usd":[69550,125725],"posted":"2026-08-14"},{"title":"Sr. Software Developer","url":"https://alion.io/job/leidos-sr-software-developer","cities":["Gaithersburg"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-08-13"},{"title":"Software Engineer - 25k Sign on Bonus","url":"https://alion.io/job/leidos-software-engineer-25k-sign-on-bonus-2","cities":["Columbia"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-08-13"},{"title":"Traveling Software/ Radar Engineer","url":"https://alion.io/job/leidos-traveling-software-radar-engineer","cities":["Huntsville"],"work_mode":"On-site","pay_usd":[69550,125725],"posted":"2026-08-12"},{"title":"Defence & Intelligence Technical Leaders – Mission Software Solutions – Canberra & Melbourne","url":"https://alion.io/job/leidos-defence-intelligence-technical-leaders-mission-software-solutions-canberra-melbourne","cities":["Melbourne","Canberra"],"work_mode":"On-site","pay_usd":null,"posted":"2026-08-12"},{"title":"Senior Software Developer","url":"https://alion.io/job/leidos-senior-software-developer-2","cities":["Chantilly"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-08-11"},{"title":"Software Developer","url":"https://alion.io/job/leidos-software-developer-7","cities":["Chantilly"],"work_mode":"On-site","pay_usd":[87100,157450],"posted":"2026-08-11"},{"title":"Software Engineer Expert","url":"https://alion.io/job/leidos-software-engineer-expert","cities":["Chantilly"],"work_mode":"On-site","pay_usd":[131300,237350],"posted":"2026-08-11"},{"title":"Senior Software Engineer (SWE-3)","url":"https://alion.io/job/leidos-senior-software-engineer-swe-3","cities":["Fort Meade"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-08-11"},{"title":"Software Developer SME","url":"https://alion.io/job/leidos-software-developer-sme-2","cities":["Chantilly"],"work_mode":"On-site","pay_usd":[154050,278475],"posted":"2026-08-11"},{"title":"Full Stack Developer","url":"https://alion.io/job/leidos-full-stack-developer-2","cities":["Ashburn"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-08-07"},{"title":"Application Developer (SWE-2)","url":"https://alion.io/job/leidos-application-developer-swe-2","cities":["Fort Meade"],"work_mode":"On-site","pay_usd":[87100,157450],"posted":"2026-08-06"},{"title":"Web Developer","url":"https://alion.io/job/leidos-web-developer","cities":["Hampton"],"work_mode":"On-site","pay_usd":[92300,166850],"posted":"2026-08-05"},{"title":"Software Engineer (SME)","url":"https://alion.io/job/leidos-software-engineer-sme","cities":["Bethesda"],"work_mode":"On-site","pay_usd":[154050,278475],"posted":"2026-08-04"},{"title":"Sr. Software Engineer","url":"https://alion.io/job/leidos-sr-software-engineer","cities":["Bethesda"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-08-04"},{"title":"Principal Software 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(SME)","url":"https://alion.io/job/leidos-biometrics-software-engineer-sme","cities":["Bethesda"],"work_mode":"On-site","pay_usd":[154050,278475],"posted":"2026-08-04"},{"title":"Sr. Full Stack Developer","url":"https://alion.io/job/leidos-sr-full-stack-developer","cities":["Bethesda"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-08-04"},{"title":"Journeyman Full Stack Application Developer","url":"https://alion.io/job/leidos-journeyman-full-stack-application-developer","cities":["Tampa"],"work_mode":"On-site","pay_usd":[87100,157450],"posted":"2026-07-31"},{"title":"Senior Analytic Developer (SWE-3)","url":"https://alion.io/job/leidos-senior-analytic-developer-swe-3-2","cities":["Fort Meade"],"work_mode":"On-site","pay_usd":[107900,195050],"posted":"2026-07-29"},{"title":"Senior Signals Software Engineer","url":"https://alion.io/job/leidos-senior-signals-software-engineer","cities":["Annapolis 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