Junior Software Developer

Leidos; St. Louis (MO); On-site; USD 70,000 - 126,000; Full time

Job summary

Leidos FS2 Aero team in Missouri is seeking a junior software developer for a 6-month, temporary-to-permanent role to design and code software solutions for the Aeronautical Navigation Office. The candidate should have a baseline understanding of software development and be eager to contribute to mission-focused projects.

Responsibilities include modifying existing GOTS code to integrate open-source solutions for web display, using C#/Java/JavaScript/TypeScript, Python, and Shell scripting;

Qualifications

• Active Top Secret clearance required.
• Must be able to obtain TS/SCI prior to starting.
• BS degree or certification and 2–4 years of relevant experience.
• Experience with JavaScript, Python, or C# development.
• Experience with web-enabled applications and SOA/Web Services.
• Strong communication skills.

Responsibilities

• Build software knowledge and modify existing GOTS code to integrate open-source solutions for web display.
• Work with languages including C#/Java, JavaScript/TypeScript, Python, Shell scripting.
• Create and document functionality in GitLab and apply DevOps principles within an Agile construct.
• Participate in Agile software development activities and ensure testing per User Story Acceptance Criteria.

Skills

JavaScript

Python

C#

Web apps

Education

BS degree or certification

Tools

Jira

Confluence

GitLab

Job description

The Leidos FS2 Aero team has an opening for a junior software developer to work on the design and coding with software solutions for the Aeronautical Navigation Office for 6 month – temporary to permanent hire position. The ideal candidate has a familiarity with and a baseline understanding of software development concepts, developing coding skills using different tools, and ambition towards future projects in support of the mission.

Primary Responsibilities

Primary responsibilities will involve building software coding knowledge providing the system administration and modification of existing GOTS code to integrate open-source software solutions for display in a web application. This role will work with programming languages to include C#/Java and JavaScript/TypeScript, Python, Shell scripting. Creation and documentation of new and existing functionality within software version control repositories (gitlab) and utilizing DevOps principals and tools to deliver new features within an Agile construct. Participate in program Agile software development initiatives (standup, planning, Increment planning) to support applications through iteration/functionality utilizing Atlassian (Jira/Confluence). Participate and collaborate with team members to assess tickets to ensure proper testing and delivery of functionality per User Story Acceptance Criteria.

Basic Qualifications

Candidate must have an active Top Secret clearance. Candidate must be able to obtain a TS/SCI prior to starting. Candidate must be able to maintain TS/SCI and obtain a successful CI poly post hire. Requires BS degree or certification and 2-4 years of prior relevant experience. Experience may be considered in lieu of a degree. Minimum 2 year of experience with JavaScript, Python, or C# development framework. Minimum 2 years of experience of working with web-enabled applications. Proactive self-starter demonstrates a positive, willing attitude and excellent oral and written communication skills. Experience in either software development projects or software integration projects in a service-oriented environment (Cloud, SOA, Web-Services) or virtualization environment. Demonstrated ability to prioritize competing responsibilities, manage workload efficiently, and deliver high-quality work with strong attention to detail. Strong verbal and written communication skills, with the ability to effectively collaborate with teams and communicate complex ideas to a variety of audiences.

Preferred Qualifications

At least 1 years of experience with DOD software requirements. At least 2 year of experience working in a government cloud environment. AWS Solutions or DevOps certification Team Collaboration tools (Jira, Confluence) Active TS/SCI with Polygraph DOD 8570 Compliant Certification (Sec+) #NSBA

Why Join Us

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.

Pay and Benefits

Original Posting: October 23, 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 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. 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 here. 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 $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit www.Leidos.com.

Securing Your Data

Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to [e-mail].

Commitment and Diversity

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.