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145 custom software engineer jobs at 93 companies in Leesburg, VA

1mo
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Custom Software Engineering Lead
Chantilly or Quantico
$117k-$243k/yr OnsiteFull Time
Accenture Federal Services
Accenture Federal ServicesNYSE: ACN: Provides technology and consulting services to U.S. federal agencies.
5+ YOE5+ years software engineering using C/C++, Java, or Python; full‑stack experience; Agile; Git and Jira; leadership experience; active TS/SCI clearance and willingness to take a polygraph.
C/C++, Java, Python, Git, Jira
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1mo
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Software Engineer
Annapolis Junction, Maryland, United States
$87k-$198k/yr OnsiteFull Time
Booz Allen Hamilton
Booz Allen HamiltonNYSE: BAH: Provides technology and management consulting services to diverse organizations.
7+ YOETS/SCI with polygraph required; 7+ years software engineering with a CS bachelor (or 11+ years without); experience with Python, Kubernetes, Docker, Helm; customer support and strong problem-solving skills.
Python, Kubernetes, Docker, Helm
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1d
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Custom Developer (.Net)
Washington, District of Columbia, United States
OnsiteFull Time
Soft Tech Consulting
Soft Tech Consulting: Provides information technology services to government agencies.
Bachelor's degree; .NET, C#, Oracle, SQL, JavaScript, TypeScript, HTML, CSS, and version control experience; top secret clearance; US citizenship; strong communication and problem-solving skills.
.NET, Oracle, Git, GitLab, GitHub, Git Actions, SVN, C#, JavaScript, TypeScript, SQL, HTML, CSS, Metastorm BPM, ASP.NET, Agile
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1mo
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Software Engineer, Lead
Annapolis Junction, Maryland, United States
$113k-$257k/yr OnsiteFull Time
Booz Allen Hamilton
Booz Allen HamiltonNYSE: BAH: Consulting and technology services for government and commercial clients
20+ YOETS/SCI with polygraph required. Requires 20+ years software engineering (or 24+ years without a degree) or a CS bachelor's plus 20+ years. Experience with Kubernetes, Docker, Helm, Python, software version control, customer support, and strong problem solving.
Kubernetes, Docker, Helm, Python, C++, Java, PHP, JUnit, CppUnit, WordPress, Moodle
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1mo
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Software Engineer 1
Annapolis Junction, Maryland, United States
OnsiteFull Time
RealmOne
RealmOne: Provides advanced technology services for national security agencies.
3+ YOE3+ years software engineering experience, JavaScript/TypeScript and Node.js, AWS, Docker, Git/GitLab, testing frameworks (Jest, Cypress), JIRA, unit/functional testing, requirements elicitation, and ability to work with customers. Active security clearance with polygraph required.
JavaScript, DOM, TypeScript, Node.js, npm, AWS, Docker, Git, GitLab CI, GitLab pipelines, Jest, Cypress, JIRA, Microsoft Office JavaScript API
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4w
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Custom Applications Developer
Arlington, Virginia, United States
$64k-$124k/yr RemoteFull Time
Accenture Federal Services
Accenture Federal ServicesNYSE: ACN: Provides technology and consulting services to US federal agencies.
2+ YOE2+ years experience with Python, React, and Git; basic GenAI knowledge; familiarity with CI/CD, DevOps, Terraform and GitHub Actions preferred; strong troubleshooting and communication skills.
Python, React, GenAI, Claude code, Terraform, Git, GitHub, CI/CD, GitHub Actions
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3w
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Senior Software Engineer, Discovery
Seattle or Washington
$191k-$253k/yr OnsiteFull Time
Anduril Industries
Anduril Industries: Defense technology building autonomous military hardware and software.
7+ YOE7+ years software engineering experience with languages such as Java, Python, C++, Rust, Go, or JavaScript; ability to architect complex systems; active U.S. Top Secret clearance required; experience with data processing and customer-facing deployments.
Java, Python, C++, Rust, Go, JavaScript
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3w
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Staff Software Engineer, Reliability Engineering & SDLC Governance
Carlsbad or Germantown or San Jose or San Francisco or New York City
$165k-$261k/yr OnsiteFull Time
Viasat
ViasatNASDAQ: VSAT: Provides global satellite broadband and secure networking communication services.
8+ YOE8+ years software engineering experience with SDLC governance, SRE/DevOps knowledge, observability, incident analysis, and cross-team influence to improve reliability and customer experience.
Prometheus, Grafana, OpenTelemetry, Datadog, AS9115
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3w
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Software Engineer–Systems (Associate/Experienced)
Chantilly or Aurora or Mesa
$94k-$171k/yr OnsiteFull Time
Boeing
BoeingNYSE: BA: Designs and manufactures aircraft, defense systems, and space technology.
1+ YOEActive U.S. Top Secret clearance, bachelor\u0002s degree, 1+ years systems/software engineering experience, familiarity with Agile/SAFe, and customer briefing skills.
Jira, Confluence, Crucible
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3w
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Staff Software Engineer, Reliability Engineering & SDLC Governance
Carlsbad or Germantown
$165k-$261k/yr OnsiteFull Time
Viasat
ViasatNASDAQ: VSAT: Provider of global satellite-based connectivity and secure communication solutions.
8+ YOE8+ years software engineering experience; proven SDLC governance and SRE/DevOps expertise; customer-first mindset; experience with complex full-stack and distributed systems; ability to drive organizational change.
Prometheus, Grafana, OpenTelemetry, Datadog, AS9115
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3w
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Software Engineer–Systems (Associate/Experienced)
Chantilly or Aurora or Mesa
$94k-$171k/yr OnsiteFull Time
Boeing
BoeingNYSE: BA: Designing and manufacturing commercial aircraft and defense systems.
1+ YOEBachelor's degree or equivalent, active U.S. Top Secret clearance (willing to sit for CI polygraph),1+ years systems/software engineering experience, familiarity with Agile/SAFe, and customer briefing skills.
Jira, Confluence, Crucible, Microsoft Excel
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6d
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Senior Mission Software Engineer, Public Sector
Austin or Honolulu or St. Louis or Washington
$186k-$279k/yr HybridFull Time
Scale AI
Scale AI: Provides data and infrastructure for training artificial intelligence models.
5+ YOE5+ years software engineering experience; strong Python and TypeScript; cloud (AWS/Azure/GCP), containers, Linux; active TS/SCI clearance; ability to operate in customer-facing, forward-deployed government environments.
Python, TypeScript, AWS, Azure, GCP, Node, React, Kubernetes, Docker, Terraform, Linux
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2mo
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Software Engineer (Hybrid) - 28693 (Columbia, MD, Maryland, United States)
Columbia, Maryland, United States
$138k-$190k/yr HybridFull Time
HII
HIINYSE: HII: Builds naval ships and provides global defense technology solutions.
9+ YOETS/SCI clearance; 9+ years in software engineering; Java, REST, microservices; OOP; agile; DoD 8140/8570 compliance; able to work on customer site in MD.
Java, Spring, Guava, REST, Git, Nexus, Maven, Linux, NiFi, Kafka, AWS, Azure, PostgreSQL, MySQL, NoSQL, Kubernetes, JIRA, Confluence, GitHub
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3w
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AI/ML Software Engineer I
Annapolis Junction, Maryland, United States
$126k-$166k/yr OnsiteFull Time
BCT
BCT: Delivering mission technology and engineering services for national security.
7+ YOEActive TS/SCI with poly required, 7+ years software engineering experience (or bachelor's + experience), DoD 8570, LLM/customization, API and UI design, security and access control, EM/security measures, Microsoft Office integration.
LLM, API, Microsoft Office
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1mo
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Application Software Engineer
Annapolis Junction, Maryland, United States
OnsiteFull Time
Gigatec
Gigatec: Providing systems engineering and software development services for defense.
Experience with Linux CLI/tools, Bash/Python/PHP scripting, Java development, IDEs (Atlassian SDK or VS Code), Ansible, CI/CD (GitLab CI), Docker, Kubernetes, Git; documentation and customer interaction skills.
Linux CLI, Linux Tools, Bash, Python, PHP, Java, Atlassian plugin software developer kit (SDK), Microsoft Visual Studio Code (VS Code), Ansible, GitLab CI, Docker, Kubernetes, Git, JIRA, Confluence
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1mo
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Forward Deployed Software Engineer
Washington, District of Columbia, United States
$150k-$220k/yr HybridFull Time
Conductor AI
Conductor AI: AI platform for automating government compliance and approval workflows.
2+ YOEActive DoD Secret clearance, US citizenship, 2+ years engineering experience, proficiency in Python and TypeScript, experience with LLMs, customer-facing technical experience, ability to travel up to ~50%.
ConductorAI, Python, TypeScript, LLMs
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1mo
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Software Engineer II, Ad Engineering
Washington, District of Columbia, United States
$99k-$165k/yr OnsiteFull Time
The Washington Post
The Washington Post: Provides daily newspaper publishing and digital news reporting services.
2+ YOE2+ years building performant customer-facing applications; strong JavaScript and typed-system experience; AWS (ECS, EC2, RDS, S3, Lambda); Docker, Jenkins/AWS Code Pipeline; experience with LLMs/ChatGPT APIs and ad tech tooling desirable.
JavaScript, LLM, ChatGPT, AWS, ECS, EC2, RDS, S3, Lambda, Docker, Jenkins, AWS Code Pipeline, CI/CD, Prebid, Prebid Server, Google Ad Manager
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2mo
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Software Engineer III, Forward Deployed
Rockville or Rockville
$120k-$145k/yr OnsiteFull Time
X-energy
X-energy: Develops advanced small modular nuclear reactors and fuel technology.
5+ YOE5+ years of relevant experience; 3+ years in customer-facing technical roles; strong React, TypeScript, AWS; ability to translate stakeholder needs into technical solutions; hybrid schedule in Rockville, MD.
React, TypeScript, Tailwind CSS, Vite, AWS, Lambda, ECS, DynamoDB, Claude Code, Git, GitLab, CI/CD
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3w
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Software Developer - ServiceNow and Javascript
Herndon, Virginia, United States
OnsiteFull Time
Ardent Principles
Ardent Principles: Provides specialized technology and program management services to government agencies.
Active TS/SCI with Full Scope Polygraph required; strong ServiceNow and JavaScript experience; familiarity with HTML/CSS, Flow Designer, and automated testing; platform customization and process analysis skills.
JavaScript, ServiceNow, HTML, CSS, ServiceNow Automated Test Framework (ATF), Flow Designer
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Software Engineer
Owings Mills, Maryland, United States
OnsiteFull Time
Valmet
ValmetNasdaq Helsinki: VALMT: Provides process technologies and automation systems for industrial manufacturing.
5+ YOE5+ years relevant experience; bachelor’s in computer or electrical engineering preferred; expertise in C/C++, GIT, Microsoft .NET (ATL, MFC, WPF, WCF), Linux and Windows; experience with OPC/OPC UA, DCOM, UDP, DCS; strong troubleshooting and customer communication skills.
C/C++, GIT, Microsoft .NET Framework, ATL, MFC, WPF, WCF, Linux, Windows, OPC, OPC UA, DCOM, UDP, DCS, CRM
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