Entry level software engineer Jobs in Denver, CO

Are you ready to build software that makes a real-world impact? Leidos is seeking a talented Mid-Level Full Stack Software Engineer to join the Chinook Program supporting an Intelligence Community customer. In this role, you’ll design, develop, and deliver modern software solutions that enable critical national security missions while working alongside some of the industry’s brightest engineers, architects, and mission experts.

As a Full Stack Engineer, you’ll contribute across the entire software development lifecycle, from crafting intuitive user interfaces to building scalable backend services and integrating secure, cloud-native solutions. Working within a collaborative Agile environment, you’ll help deliver high-quality capabilities through iterative development, continuous integration, and DevSecOps best 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.

If you’re passionate about solving complex technical challenges, learning emerging technologies, and developing software that directly supports mission success, this is an exciting opportunity to grow your career while making a meaningful difference.

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

• Englewood, CO

• St. Louis, MO

• Tucson, AZ

Clearance Level Required:

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

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 managers 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.

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

• 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

#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:

September 8, 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.