Junior Software Engineer

Markon

. Develop and modify application source code in response to new requirements and requests for change .

Posted 9/21/2026full-timeMcLean • Virginia • United StatesJunior💰 $140,000 - $170,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Proficient in developing and modifying application source code, with a strong focus on REST API design and Agile software development practices. Capable of integrating third-party code, maintaining software library architecture, and ensuring compliance with coding standards.

Highest-signal resume keywords

Active TS/SCI ClearanceAgile Software DevelopmentREST API DesignSoftware Issue-Tracking (JIRA).NET, Java, JavaScript, SQL, Python

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

.NETJavaJavaScriptSQLPythonXMLVisual BasicTomcatApacheRuby

Tools & Technologies

JIRACloud-Based EnvironmentsSoftware LibrariesAudio/Video ProcessingImage-Processing Algorithms

Certifications & Qualifications

Active TS/SCI ClearanceFS Polygraph

Industry Keywords

Software Development Life Cycle (SDLC)Configuration ManagementModularityReusable CodeCoding Standards Compliance

Tech Stack

Tools & technologies

ApacheCloudJavaJavaScriptPythonRubySDLCSQLTypeScript.NET

About the role

Key responsibilities & impact

Develop and modify application source code in response to new requirements and requests for change
Provide application bug fixes, enhancements, and GUI improvements
Develop and deploy software applications across Sponsor environments, including cloud-based environments
Design and develop REST APIs
Integrate externally developed code into core software libraries
Install and configure application software
Evaluate third-party vendors and software partners
Maintain software library design and architecture, including module APIs, code organization, and coding standards compliance
Emphasize modularity, reusable code, clean subsystem interfaces, and overall design integrity
Coordinate with configuration management personnel to integrate externally developed software into core software libraries
Develop software for deployment on Sponsor networks
Develop and support software libraries involving audio/video, image-processing algorithms, operating systems and file systems, and device drivers
Assist the Sponsor in developing standards, methods, and procedures for product quality, release readiness, and software acceptance
Conduct testing throughout all levels of the SDLC
Perform regression testing and follow established testing procedures
Support Agile software development practices throughout the application lifecycle
Track and manage software issues using tools such as JIRA
Provide software availability and reliability metrics during monthly status reviews

Requirements

What you’ll need

Active TS/SCI with a FS Polygraph
Bachelor’s degree or higher in Computer Science, Information Systems, Engineering, Mathematics, or another related scientific or technical discipline
Minimum of 2 years of software engineering experience within the last 5 years
Demonstrated experience with at least 3 of the following technologies: .NET, Visual Basic, Java, JavaScript, Tomcat, SQL, XML, Python, HTML, LDAP certificates, Apache, Ruby
Demonstrated experience supporting full-lifecycle Agile software development projects
Demonstrated experience with software issue-tracking tools such as JIRA
Collectively, the team must demonstrate experience across all of the listed technologies

Benefits

Comp & perks

Medical
Dental
Vision
Life Insurance
Short-Term Disability
Long-Term Disability
401(k) match
Flexible Spending Accounts
EAP
Training and Tuition Assistance
Paid Time Off
Holidays