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Leidos

Mid-Level Software Engineer

St. Louis, MO$87,100 – $157,450Posted 23 days ago

Apply on company site View full job

Description

Turn Your Engineering Experience Into Mission Impact

You've built your software engineering foundation. Now it's time to take ownership of technology that truly matters. Leidos is seeking an accomplished Mid-Level Software Engineer to join the Chinook Program supporting an Intelligence Community (IC) customer and helping evolve an application supporting important national security objectives.

As a Mid-Level Software Engineer, you'll have the opportunity to own meaningful features and software components from design through deployment. Independently you'll design, develop, integrate, test, and maintain software capabilities. You're expected to take ownership of assigned features and components while contributing to technical decisions, code quality, automation, and continuous improvement. You'll solve challenging technical problems, collaborate with talented engineers across disciplines, and contribute to modern cloud, DevSecOps, API, and application technologies.

Position may be performed in the following locations below.

• Tucson, AZ

• Gaithersburg, MD

• Alexandria, VA

• Chantilly, VA

• Englewood, CO

• St. Louis, MO

Clearance Level Required:

Active Top Secret/SCI with the ability to successfully pass a Polygraph examination.

Primary Responsibilities:

• Design, develop, integrate, test, deploy, and maintain a software application that supports our customer's GEOINT mission.

• Translate functional and technical requirements into software solutions.

• Independently implement moderately complex software features.

• Develop maintainable, scalable, and secure application components.

• Develop and consume RESTful APIs and backend services.

• Work with relational and/or NoSQL databases.

• Troubleshoot application defects, integration issues, and performance problems.

• Perform root-cause analysis and implement corrective actions.

• Develop unit, integration, and automated tests.

• Participate in code reviews and establish high-quality coding practices.

• Support CI/CD and DevSecOps processes.

• Contribute to containerized application environments.

• Participate in agile ceremonies, sprint planning, backlog refinement, demonstrations, and technical working sessions.

• Collaborate with Test Engineering to ensure features meet acceptance criteria and quality expectations.

• Support deployment, monitoring, and sustainment of the application.

• Identify opportunities to improve application performance, reliability, maintainability, and security.

• Provide technical guidance to junior engineers.

• Maintain appropriate software and technical documentation.

Basic Qualifications:

• US citizenship is required per contract.

• Bachelor's degree in Computer Science, Software Engineering, or related field and 4-8 years of prior relevant experience or Master's with less than 2-6 years of prior relevant experience. Equivalent experience may be considered in lieu of degree.

• Proficiency with the following technologies:

oWeb: HTML, CSS, JSON, Ajax, and REST APIs

oObject-oriented Programming: Python, Java, or JavaScript

oFront-end and Back-end Frameworks: React, Angular, Vue.js, jQuery, Spring Boot, Django, Node.js, Flask, or Svelte

oCloud Development: AWS, Azure, or similar cloud platforms

oRelational Database: MySQL, PostgreSQL, or SQL Server

oOperating System: Windows, Linux

oVersion Control System: Git

• Understanding of modern software design patterns and coding standards.

• Experience architecting, developing, and delivering complex software systems into production.

• Experience with CI/CD tools (GitLab CI, Jenkins) and agile collaboration tools (JIRA, Confluence).

• Familiarity with cloud environments such as AWS (C2S or GovCloud) and containerization technologies (Docker, Kubernetes).

• Understanding of secure coding practices and government system accreditation processes (e.g., RMF, STIGs).

• Strong, self-motivated desire to learn new programming languages, tools, frameworks, and techniques.

Preferred Qualifications:

• Experience supporting Intelligence Community (IC) mission systems.

• Experience with geospatial, intelligence, or other mission-specific data and workflows.

• Experience with AWS and cloud-native architectures.

• Experience with Infrastructure-as-Code (Terraform, Ansible, CloudFormation).

• Experience with GitLab CI/CD, Jenkins, SonarQube, Nexus, Vault, or Keycloak.

• Experience with PostgreSQL, MySQL, SQL Server, OpenSearch/Elasticsearch, or similar technologies.

• Experience with event-driven architectures and messaging technologies.

• Experience with observability, monitoring, logging, and application performance management.

#Chinook

#NSBA

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:

October 15, 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 $87,100.00 - $157,450.00

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.

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.

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.

About Leidos

https://www.leidos.com/

Size: 10,000+ employees
Industry: Information Technology

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