Mid-Level Software Engineer (St Louis)

Description

Leidos National Security Sector combines technology-enabled services and mission software capabilities in the areas of cyber, logistics, security operations, and decision analytics to support our defense and intel customers' mission to defend against evolving threats around the world. Our team's focus is to ensure our customers have the right tools, technologies, and tactics to keep pace with an ever-evolving security landscape and succeed in their pursuit to protect people and critical assets.

The Intelligence Production Solutions Division (IPSD), part of the Decision Advantage Solutions Business Area, is currently seeking a Mid-Level Software Engineer for the Chinook Program. The Chinook Program delivers secure, scalable, and mission-enabling software applications across our customer's enterprise using Agile and DevSecOps practices.

In this role, you will work on cross-functional development teams to build and maintain microservices, APIs, and web-based applications that support GEOINT data access, visualization, and dissemination. You will contribute to the full software lifecycle and will have the opportunity to work directly with users, cloud engineers, and mission stakeholders.

Position may be performed in the following locations below. Please note Gaithersburg, MD is the program's primary work location.

Gaithersburg, MD

Alexandria, VA

Chantilly, VA

Aurora, CO

St. Louis, MO

Tucson, AZ

Clearance Level Required :

Must have a Top Secret with SCI eligibility and able to obtain a Polygraph.

Primary Responsibilities :

Design, develop, test, and deploy software solutions that support our customer's GEOINT mission.

Participate in agile development sprints and contribute to daily stand-ups, sprint planning, and retrospectives.

Build and maintain secure, containerized applications using technologies such as Docker, Kubernetes, and AWS.

Develop RESTful APIs and user-facing interfaces with modern tools (e.g., React, Node.js, Flask or Sprint Boot).

Collaborate with mission users and product owners to refine requirements and improve user experience.

Support DevSecOps pipelines and ensure code meets security and accreditation standards.

Participate in code reviews and mentor junior developers as needed.

Resolve various tasks as prioritized by the team product owner.

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 2-6 years of prior relevant experience.

Proficiency with the following technologies :

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

Object-oriented Programming : Python, Java, or JavaScript

Advanced Programming : Go

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

Cloud Development : AWS, Azure, or similar cloud platforms

Relational Database : MySQL, PostgreSQL, or SQL Server

Operating System : Windows, Linux

Version Control System : Git

Deep 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 :

Frontend Web Development : UI / UX

NoSQL Database : OpenSearch / Elasticsearch.

Cloud Exposure :

Multi-cloud architectures : AWS, IBM, Google, Azure, and Oracle.

Specific AWS Services : S3, SQS, SNS, EC2, CloudFormation and RDS.

Experience working on a customer contract or in the Intelligence Community (IC).

Familiarity with geospatial tools and standards :

GeoServer

PostGIS

OGC APIs

ESRI ArcGIS

Exposure to Infrastructure-as-Code (Terraform, Ansible)

Certifications such as AWS Certified Developer, Security+, SAFe Practitioner or similar.

#Chinook

Come break things (in a good way). Then build them smarter.

We're the tech company everyone calls when things get weird. We don't wear capes (they're a safety hazard), but we do solve high-stakes problems with code, caffeine, and a healthy disregard for how it's always been done.

Original Posting : October 3, 2025

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 $85,150.00 - $153,925.00

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.