Junior Software Developer

Leidos; Huntsville (TN); On-site; USD 70,000 - 126,000; Full time

Job summary

Leidos Defense Sensors’ Uncrewed Systems Integration and Test group seeks a motivated Junior Software Engineer to join the S3I Joint Technology Center – Systems Integration Lab, focusing on the design, development, and integration of UAS software in a collaborative lab environment.

The role requires a BS in computer science (or related) with 2–4 years of experience or an MS with 1–2 years, strong OO programming (Java/C++/C#), Gitlab CI/CD, scripting (Bash, Python, PowerShell), and familiarity

Qualifications

• BS degree in computer science or related technical degree plus 2-4 years of prior relevant experience or MS degree in computer science or related technical degree plus 1-2 years of prior relevant experience.
• Experience with object-oriented programming in multiple languages such as java, C++, and C#.
• Experience using Gitlab CI/CD.
• Experience with scripting languages such as Bash, Python, or PowerShell including the automation of system and application installations is required.
• Understanding of general computing system architectures and virtual machines/containers.
• Strong command line experience with UNIX based operating system or Windows command line configuration is required.
• Strong analytical and organizational skills to handle multiple tasks and projects and to work independently.
• 1-year+ professional software development experience.
• Excellent written and verbal communication skills.
• Must be a US citizen, possess be able to maintain an active Secret clearance.
• Must be a resident of Huntsville, AL or willing to relocate to the Huntsville, AL area.

Responsibilities

• Software Development & Optimization: Support the design and implementation of software solutions, ensuring high-quality, maintainable, and scalable code.
• Documentation & Communication: Responsible for creation of detailed technical documentation, including system designs, APIs, and architectural diagrams.
• Cross-Functional Collaboration: Collaborate with managers, hardware engineers, network engineers, and other stakeholders to implement system requirements and ensure seamless Integration between software, hardware, and network components.
• Innovation & Technology Evaluation: Stay current on emerging technologies and industry trends, new tools, frameworks, and methodologies that improve the development process and system performance.

Skills

Object‑oriented programming

Python

PowerShell

Unix/Linux

Windows cmd

Team collaboration

Education

Bachelor's degree in Computer Science or related field

Master's degree in Computer Science or related field

Tools

Gitlab CI/CD

Gradle

Jira

Job description

Looking for an opportunity to make an impact?

At Leidos, we deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customers’ success. We empower our teams, contribute to our communities, and operate sustainably. Everything we do is built on a commitment to do the right thing for our customers, our people, and our community. Our Mission, Vision, and Values guide the way we do business.

Your greatest work is ahead!

Leidos Defense Sensors’ Uncrewed Systems Integration and Test is seeking a motivated and ambitious Junior Software Engineer to join the Software, Simulation, Systems Engineering and Integration Directorate (S3I) Joint Technology Center – Systems Integration Lab (JSIL) Technology and Certification Center.This position collaborates with subject matter experts in the requirements, design, development, and implementation of UAS related software.

If this sounds like the kind of environment where you can thrive, keep reading!

Leidos Defense Systems Sector provides a diverse portfolio of systems, solutions, and services covering land, sea, air, space, and cyberspace for customers worldwide. Solutions for Defense include enterprise and mission IT, large-scale intelligence systems, command and control, geospatial and data analytics, cybersecurity, logistics, training, and intelligence analysis and operations support. Our team is solving the world’s toughest security challenges for customers with “can’t fail” missions. To explore and learn more, click here!

Primary Responsibilities

• Software Development & Optimization: Support the design and implementation of software solutions, ensuring high-quality, maintainable, and scalable code. Assist with efforts in debugging, and optimization for large-scale systems.
• Documentation & Communication: Responsible for creation of detailed technical documentation, including system designs, APIs, and architectural diagrams. Communicate complex technical concepts clearly to non-technical stakeholders and executives.
• Cross-Functional Collaboration: Collaborate with managers, hardware engineers, network engineers, and other stakeholders to implement system requirements and ensure seamless integration between software, hardware, and network components.
• Innovation & Technology Evaluation: Stay current on emerging technologies and industry trends, new tools, frameworks, and methodologies that improve the development process and system performance.

Basic Qualifications

• BS degree in computer science or related technical degree plus 2-4 years of prior relevant experience or MS degree in computer science or related technical degree plus 1-2 years of prior relevant experience.
• Experience with object-oriented programming in multiple languages such as java, C++, and C#.
• Experience using Gitlab CI/CD.
• Experience with scripting languages such as Bash, Python, or PowerShell including the automation of system and application installations is required.
• Understanding of general computing system architectures and virtual machines/containers.
• Strong command line experience with UNIX based operating system or Windows command line configuration is required.
• Strong analytical and organizational skills to handle multiple tasks and projects and to work independently.
• 1-year+ professional software development experience.
• Excellent written and verbal communication skills.·
• Must be a US citizen, possess be able to maintain an active Secret clearance.
• Must be a resident of Huntsville, AL or willing to relocate to the Huntsville, AL area.

Preferred Qualifications

• Experience with Atlassian workflow management software.
• Experience with software development and testing
• Experience with Uncrewed Aircraft Systems.
• Experience using Gradle.
• Willingness to be hands-on with the hardware away from assigned desk.

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:

September 24, 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 $69,550.00 - $125,725.00

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.