Description
Junior Software Engineer
Orlando, FL
Leidos Defense is seeking a Software Engineer to join our Modeling, Simulation & Training team. You will help design, develop, and maintain immersive simulation environments using your software skills, supporting advanced training, modeling, and simulation for defense programs. This role offers professional growth in a collaborative, fast-paced environment, with opportunities to work on mission-critical systems and cutting-edge technology.
This position requires a U.S. Citizenship and the ability to obtain and maintain a DISS Secret Security Clearance.
Primary Responsibilities:
Design, develop, test, and maintain simulation and training software within Agile methodologies.
Integrate Unity-based environments with backend systems and data pipelines (C++, Python, Java).
Develop modeling, simulation, and analysis toolsets for algorithm development, requirements validation, and system testing.
Collaborate with cross-functional teams (software, hardware, systems engineers) to deliver performant, scalable solutions.
Debug, analyze, and optimize complex software systems across multiple architectures and operating systems (Windows, Linux).
Implement and maintain CI/CD pipelines using tools such as Git, Jenkins, and Docker.
Create and update documentation for design, development, and testing.
Support integration, testing, and deployment of software in operational and training environments.
Basic Qualifications:
Bachelor's degree in Computer Science, Software Engineering, Computer Engineering, or related field from an ABET-accredited institution. Professional experience may be considered in lieu of a degree.
U.S. Citizenship required; ability to obtain and maintain a DISS Secret Security Clearance
1+ years of hands-on experience in software development (internship/co-op experience acceptable).
Strong understanding of object-oriented design, data structures, and network communications.
Experience with Unity for simulation/game development.
Familiarity with C++, Python, Java, and Linux-based systems.
Excellent verbal, written, and visual communication skills.
Ability to thrive in a collaborative, fast-paced technical environment.
Experience using software configuration management tools.
Preferred Qualifications:
Active DISS Secret clearance.
Familiarity with Atlassian products (Jira, Confluence, Bitbucket).
Exposure to military simulation environments.
Experience with web technologies (HTML, CSS, XML, REST, JSON).
Knowledge of interface communication standards/protocols (TCP/IP, UDP, DDS).
Experience designing and implementing simulations involving spatial analysis, vector geometry, and extensive datasets.
Participate in peer reviews and continuous process improvement. Experience with UML or SYSML to document analysis and design.
Experience with MS Teams, SharePoint.
Experience with automated testing techniques.
AMSOPP1
If 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.
Original Posting:
June 3, 2026
For 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.
Pay Range:
Pay Range $57,850.00 - $104,575.00
The Leidos pay range for this job level is a general guideline onlyand 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.
About Leidos
Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com .
Pay and Benefits
Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits .
Securing Your Data
Beware of fake employment opportunities using Leidos' name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system - never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com .
If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission (https://reportfraud.ftc.gov/#/) .
Commitment to Non-Discrimination
All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.
REQNUMBER: R-00184724
All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. Leidos will consider qualified applicants with criminal histories for employment in accordance with relevant Laws. Leidos is an equal opportunity employer/disability/vet.
