Job 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

Pay Range:

Pay Range $57,850.00 - $104,575.00

The 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.