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1,732 mid level software engineer jobs at 505 companies in Leesburg, VA

2mo
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Mid-Level Software Engineer
Fort Meade, Maryland, United States
$70k-$190k/yr OnsiteFull Time
Belay Technologies
Belay Technologies: Provides specialized technology and engineering services to the DoD.
12+ YOEMid-level software engineer with strong Python, production-scale systems, and AI workflow experience.
Python, Apache Kafka, Elasticsearch, PydanticAI, Langgraph, DeepAgents
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Mid-Level React Developer
Annapolis Junction or Columbia
$150k-$200k/yr HybridFull Time
Freedom Technology Solutions Group
Freedom Technology Solutions Group: Provides geospatial and software engineering solutions for national security agencies.
6+ YOEMid-level React/Java/Spring Boot developer with TS/SCI poly; 6+ years exp; strong React, Java, REST APIs; Camunda/Pega a plus.
React, Java, Spring Boot, Camunda, Pega, Oracle, REST, SQL
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2mo
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Mid Level Forward Deployed Software Engineer
Arlington, Virginia, United States
RemoteFull Time
PVM
PVM: Specialized services firm implementing Palantir technology for government agencies.
3+ YOEMid-level software engineer with 3+ years of experience; Python/TypeScript/Java; Palantir Foundry experience; government/defense environment familiarity.
Palantir Foundry, Python, TypeScript, Java, Foundry Workshop, Ontology
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3w
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Software Engineer Mid Level
Annapolis Junction, Maryland, United States
$200k-$275k/yr OnsiteFull Time
Integrity Technology Consultants
Integrity Technology Consultants: Provides engineering and management consulting solutions to US national security.
7+ YOETS/SCI with Full-Scope Polygraph, ~7+ years software engineering experience, bachelor’s in computer science or related (or 4 extra years experience), strong software design and testing skills.
Apache AirFlow, Python, Apache Spark, Trino, Kubernetes
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3mo
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Mid-Level Software Engineer
Fairfax or Lexington
$90k-$180k/yr OnsiteFull Time
Riverside Research
Riverside Research: Independent non-profit performing scientific research for national security.
8+ YOESecret clearance; 8-10 years software Eng; ML/AI with Python/Java/C++; ML libraries; cloud; Agile; Git.
Python, Java, C++, TensorFlow, PyTorch, Scikit-learn, Git, AWS, Azure
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Mid-Level Software Engineer
Washington, District Of Columbia, United States
$145k-$190k/yr OnsiteFull Time
Visionist
Visionist: Provides software engineering and data analytics for national security.
10+ YOETop Secret/SCI clearance required; 10 years software development experience; OOP and multi-INT background; strong documentation and collaboration skills.
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2mo
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Mid-level Software Engineer
Annapolis Junction, Maryland, United States
OnsiteFull Time
Entegra Systems
Entegra Systems: Provides engineering and intelligence analysis for government missions.
6+ YOESix+ years in software development with at least four years in Java; Oracle PL/SQL; experience with Windows, UNIX/Linux; TS/SCI with poly clearance.
Java, Oracle PL/SQL, JDBC, Linux, Camel, JMS, Hadoop, REST, SOAP, ExtJS, OSGi, Aries Blueprint, Tibco, ActiveMQ, Oracle, Accumulo, Eclipse IDE
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3mo
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Mid-Level Software Engineer
Fairfax or Lexington
$90k-$180k/yr OnsiteFull Time
Riverside Research
Riverside Research: Conducts independent scientific research for US national security.
8+ YOEU.S. citizenship, current Secret clearance and ability to obtain TS/SCI, Bachelor's degree, 8+ years software engineering experience focusing on ML/AI, proficiency in Python/Java/C++, ML libraries, cloud and version control.
Python, Java, C++, TensorFlow, PyTorch, Scikit-learn, Git, AWS, Azure, LangGraph, OpenAI SDK, HuggingFace, ollama, LM Studio, llama.cpp
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1d
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Mid-Level Software Engineer
United States or Westminster or Herndon
$105k-$177k/yr RemoteFull Time
Vantor
Vantor: Providing AI-powered spatial intelligence and high-resolution Earth observation.
4+ YOEU.S. citizen with active Top Secret (or CBP/DHS suitability) clearance, bachelor\u0002s degree or equivalent, 4+ years software development experience, proficiency in Java/Rust and Python/JavaScript/TypeScript, and experience with agile tools.
Java, Rust, Python, JavaScript, TypeScript, Jira, Confluence, git, Apache Flink, Apache Kafka, React, Next, Leaflet, Map Libre, Redux, AWS, Azure, Google Cloud, OpenStack, Kubernetes, Docker, Jenkins, ArgoCD, Harness, GitLab CI, GitHub Actions, PostgreSQL, Apache Iceberg
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2mo
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Mid-Level Software Developer
Washington, District of Columbia, United States
RemoteFull Time
Fusion Technology
Fusion Technology: Provider of IT services and solutions for government agencies.
3+ YOE3+ years software development experience; Java, Spring Boot; REST/SOAP; front-end basics; Elasticsearch/OpenSearch; Oracle SQL; Maven; Git/Bitbucket; AWS/Jenkins/Jira/containers (nice to have).
Java, Spring Boot, REST, SOAP, HTML, JSP, Servlets, Elasticsearch, OpenSearch, Oracle SQL, Maven, Git, Bitbucket, AWS, Jenkins, Jira, Docker, Kubernetes, NIEM XML
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1mo
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Mid-Level Software Developer
Laurel, Maryland, United States
$150k-$200k/yr OnsiteFull Time
SITEC
SITEC: Provides specialized IT and engineering services to government agencies.
6+ YOEActive TS/SCI with Polygraph; bachelor's in a technical discipline (or 10 years' experience); 6+ years software development experience; experience with JavaScript frameworks, RESTful endpoints, Linux, and MongoDB.
JavaScript, Linux, MongoDB, AWS, GitLab, GitLab runners, Docker
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2mo
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Software Engineer - Mid Level
Annapolis Junction, Maryland, United States
$105k-$185k/yr OnsiteFull Time
Lockheed Martin
Lockheed MartinNYSE: LMT: Designs and manufactures global security and aerospace systems.
7+ YOEBachelor's in engineering/CS (or 4 yrs experience), 7+ years SWE experience, active TS/SCI with polygraph, Linux development proficiency, coding in Python, C++, Java, or JavaScript required.
Linux, Python, C++, Java, JavaScript, GitLab, GitHub, Jira, Confluence, Software-Defined Radio (SDR)
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3mo
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Mid-Level Software Engineer
Annapolis Junction, Maryland, United States
$102k-$190k/yr OnsiteFull Time
AeroVironment
AeroVironmentNASDAQ: AVAV: Designs and manufactures unmanned aircraft and tactical missile systems.
7+ YOESeven to fourteen years SWE experience; Bachelor's in CS; Top Secret/SCI with Polygraph; strong Java and Python; SDLC with Agile; cloud and ML/AI experience preferred.
Java, Python, GitLab, Jenkins, Maven, Jira, Confluence, AWS, Azure, Google Cloud, Docker, Kubernetes, Apache Spark, Hadoop, ML/AI
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1mo
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Mid-Level Software Developer
Springfield or Arlington
$85k-$150k/yr RemoteFull Time
JRAD
JRAD: Provides technical research and defense support to federal agencies.
5+ YOEBachelor's in CS or related, 5+ years software development experience, proficiency with Java/C#/C++/Python/JavaScript, Spring preferred, SSO experience, databases, REST/microservices, Docker/Kubernetes, Git/GitHub, Agile; security eligibility.
Java, C#, C++, ASP.NET, Python, JavaScript, Spring MVC, Spring Boot, Scala, Http4s, Node.js, React, Angular, Vue.js, PostgreSQL, MySQL, MongoDB, Docker, Kubernetes, Git, GitHub, JIRA, Jenkins, GitLab CI/CD, GitHub Actions, JUnit, PyTest, Jest, AWS, Azure, Google Cloud Platform, SAFe, Http4s
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1mo
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Mid-Level Software Developer
Reston, Virginia, United States
$97k-$165k/yr OnsiteFull Time
BAE Systems
BAE SystemsLondon Stock Exchange: BA: Provides advanced defense, aerospace, and security technology solutions.
8+ YOEBachelor's degree required; 8 years of Agile software development experience integrating front- and back-end systems (portion within last 2 years); Intelligence Community experience; current Top Secret/SCI clearance required; eligible for polygraph; U.S. person/citizenship required.
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1mo
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Mid-Level Software Developer
Washington, District of Columbia, United States
$160k-$180k/yr OnsiteFull Time
Envisioneering
Envisioneering: Provides engineering, R&D, and electronic warfare solutions for defense.
3+ YOETop Secret clearance, 3+ years DevSecOps experience, Bachelor\u0002s in CS/CE/IT or STEM, familiarity with C++, Python, Java, Rust, MySQL, Docker/Podman, React, Jenkins, Artifactory, SonarQube, REST API, and IT certifications.
C++, Python, Java, Rust, MySQL, Docker, Podman, React, Jenkins, Artifactory, SonarQube, REST API, DevSecOps, CI/CD
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2w
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Mid-Level Software Developer
Reston, Virginia, United States
$90k-$156k/yr OnsiteFull Time
Absolute Business Solutions Corp
Absolute Business Solutions Corp: Provides technology and intelligence services to the US government.
8+ YOE8+ years of relevant experience, Bachelor\u0002s degree (or substitute experience), TS/SCI clearance with CI polygraph, experience developing secure applications for intelligence or DoD environments.
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Mid-level C++ Software Engineer
Manassas, Virginia, United States
$119k-$132k/yr OnsiteFull Time
General Dynamics Mission Systems
General Dynamics Mission SystemsNYSE: GD: Designs and manufactures defense and mission-critical technology solutions.
5+ YOEBachelor's in computer/software/engineering or related STEM and 5+ years experience (or Master's +3). DoD Secret clearance and U.S. citizenship required. Proficiency in C/C++, Linux; Docker/Kubernetes and MATLAB preferred.
C/C++, Linux, Docker, Kubernetes, MATLAB
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1w
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Software Engineer Mid Level
Fort Meade or Annapolis Junction
$170k-$200k/yr OnsiteFull Time
ELEVI Associates
ELEVI Associates: Provides cyber security and IT engineering for federal agencies.
14+ YOEActive security clearance with poly required; 14 years SWE experience or bachelor's (5+ yrs substitution). Must work in Annapolis Junction/Fort Meade, MD. Skills: Python, Atlassian, Git, IntelliJ/Eclipse; virtualization experience. Desired: Kotlin, Spring/Spring Boot, Kubernetes, Java, REST.
Python, Atlassian, Git, IntelliJ, Eclipse, Kotlin, Spring, Spring Boot, Kubernetes, Java, REST
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1w
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Mid-Level Software Engineer
Annapolis Junction, Maryland, United States
$115k-$190k/yr OnsiteFull Time
GliaCell Technologies
GliaCell Technologies: Software and systems engineering for the intelligence community.
7+ YOEActive or reinstatable TS/SCI with Polygraph, U.S. citizenship, 7+ years SWE experience, BS in Computer Science (or equivalent), strong Java skills, experience with Quarkus, PrimeFaces, SQL, PostgreSQL, and ElasticSearch.
Java, Quarkus, PrimeFaces, SQL, PostgreSQL, ElasticSearch
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