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17 backend net developer jobs at 11 companies in Leesburg, VA

1w
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Sr. Backend Engineer (.NET Core)
Washington or Falls Church
RemoteFull Time
Data Society Group
Data Society Group: Provides data science training and AI solutions for organizations.
6+ YOE6+ years backend development with 4+ years .NET Core/C#, experience leading offshore teams, Azure SQL, Azure Service Bus, Azure API Management, CI/CD with Azure DevOps and Veracode, API and microservices design.
.NET Core, C#, Azure SQL, Azure Service Bus, Azure API Management (APIM), Azure DevOps, Veracode, React, Oracle Fusion Cloud, Claude Code, GitHub Copilot, Cursor
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3w
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Back-End Software Developer
Arlington, Virginia, United States
$120k-$160k/yr OnsiteFull Time
SAIC
SAICNYSE: SAIC: Provides engineering, IT, and mission support services to government.
U.S. citizen with active Secret clearance; experience with C#/.NET Core or .NET Framework, PL/SQL, API development, RESTful services, Git/Gitlab, and enterprise application delivery in Agile environments.
Microsoft .NET Core, Microsoft .NET Framework, C#, PL/SQL, Git, Gitlab, REST API, JWT, Docker, CI/CD
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3w
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Back-End Software Developer
Arlington, Virginia, United States
OnsiteFull Time
SAIC
SAICNASDAQ: SAIC: Provides government and defense clients with technology and engineering services.
U.S. citizen with active Secret clearance; proven API development using C#/.NET Core or .Net Framework; PL/SQL and relational DB experience; REST/JWT, Git/GitLab, Docker, CI/CD; enterprise application development in Agile.
C#, .NET Core, .Net Framework, PL/SQL, SQL, Git, GitLab, REST, JWT, Docker, CI/CD, VB.NET
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4d
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Back-End Developer
Springfield, Virginia, United States
$100k-$145k/yr OnsiteFull Time
VISTA Technology Services
VISTA Technology Services: Provides technical services for government and defense agencies.
8+ YOEBachelor's degree,8+ years back-end experience,active DoD clearance (Top Secret/SCI),expertise in server-side languages,APIs,databases,security practices for classified environments.
Python, Java, C#, Ruby, Docker, Kubernetes, Django, Spring, .NET, MongoDB, Cassandra, REST, GraphQL, AWS, Azure, GCP, Node.js, PostgreSQL, MySQL, Kafka, RabbitMQ, Redis, Memcached, Terraform, Ansible, AWS Lambda, Azure Functions
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1w
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Back End Developer
Fort Belvoir, Virginia, United States
$185k-$220k/yr OnsiteFull Time
Cape Fox Federal Integrators
Cape Fox Federal Integrators: Provides government agencies with professional, technical, and training services.
8+ YOETop Secret/SCI eligibility with CI Polygraph, Bachelor’s in CS or related, 8+ years backend experience, proficiency with server-side languages, databases, APIs, cloud, containers, and classified-environment security.
Python, Java, C#, Ruby, Node.js, PostgreSQL, MySQL, MongoDB, Cassandra, REST, GraphQL, AWS, Azure, GCP, Docker, Kubernetes, Django, Spring, .NET, Kafka, RabbitMQ, Redis, Memcached, Terraform, Ansible, AWS Lambda, Azure Functions
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2d
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Senior Back-End Developer - Onsite at Fort Belvoir, VA (Top Secret/SCI and CI Poly is Required)
Fort Belvoir, Virginia, United States
OnsiteFull Time
Booker DiMaio
Booker DiMaio: Engineering innovation and software modernization services provider.
8+ YOEActive TS/SCI with CI Polygraph, Bachelor's in CS or related, 8+ years back-end experience, expertise with Python/Java/C#/Ruby/Node.js, REST/GraphQL, relational and NoSQL databases, cloud (AWS/Azure/GCP), Docker/Kubernetes, secure coding.
Python, Java, C#, Ruby, Node.js, GraphQL, PostgreSQL, MySQL, MongoDB, Cassandra, AWS, Azure, Google Cloud Platform, Docker, Kubernetes, Django, Spring, .NET, Kafka, RabbitMQ, Redis, Memcached, Terraform, Ansible, AWS Lambda, Azure Functions
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1w
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Software Engineer - .NET / SES
Reston, Virginia, United States
OnsiteFull Time
Securiport
Securiport: Provides biometric and big data solutions for global border security.
3+ YOE3–5 years backend software experience with C#/.NET, APIs/microservices, relational databases, CI/CD, cloud (AWS/Azure), and strong problem-solving skills.
C#, .NET, REST, gRPC, SQL Server, MySQL, GitHub, Azure DevOps, Jenkins, Docker, Kubernetes, Kafka, RabbitMQ, IBM MQ, AWS, Azure, React, JavaScript, TypeScript
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Software Engineer - .NET / APIS
Reston, Virginia, United States
OnsiteFull Time
Securiport
Securiport: Provides biometric and big data solutions for global border security.
3+ YOE3+ years experience building C#/.NET backend services, APIs and microservices; SQL Server/MySQL; CI/CD and cloud (AWS/Azure); strong problem solving and teamwork; Bachelor\u0002s degree.
C#, .NET, REST, gRPC, SQL Server, MySQL, GitHub, Azure DevOps, Jenkins, Docker, Kubernetes, Kafka, RabbitMQ, IBM MQ, AWS, Azure, React, JavaScript, TypeScript
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4d
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Senior Software Engineer
Tysons, Virginia, United States
$113k-$148k/yr HybridFull Time
Alarm.com
Alarm.comNasdaq: ALRM: Provides cloud-based smart home security and automation solutions.
5+ YOEBachelor's or equivalent experience,5+ years software development,strong OOP skills,C#/.NET and SQL Server experience,backend APIs,Ember.js,CI/CD,Kafka knowledge and IoT experience preferred.
C#, .NET, SQL Server, Ember.js, Kafka, CI/CD
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2w
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Senior Full-Stack Developer
Reston, Virginia, United States
OnsiteFull Time
Securiport
Securiport: Provides biometric and big data solutions for global border security.
7+ YOE7+ years building full-stack apps with modern JavaScript/TypeScript front ends, a mainstream backend (Node.js, Python, Java, .NET), relational databases, system integrations, secure development, and offline-resilient designs.
JavaScript, TypeScript, Node.js, Python, Java, .NET, ASYCUDA, SYDONIA, ETL, ELT, CI/CD
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2w
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Software Engineer II
Tysons, Virginia, United States
$88k-$123k/yr HybridFull Time
Alarm.com
Alarm.comNasdaq: ALRM: Provides cloud-based smart home security and automation solutions.
2+ YOEBachelor's degree or equivalent experience, 2+ years professional software development, strong OOP skills (C# preferred), backend/SQL experience, familiarity with modern JS frameworks and unit testing.
C#, .NET, SQL Server, Kafka, Ember.js, Angular, React, iOS, Android
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1mo
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Software Developer (Mid) TS/SCI
Arlington, Virginia, United States
$130k-$145k/yr OnsiteFull Time
Amentum
AmentumNYSE: AMTM: Provides engineering, technology, and mission support to government agencies.
5+ YOEActive DoD TS/SCI clearance, 5+ years software development experience, bachelor’s degree (or equivalent experience), AWS certifications, experience with backend languages and frameworks, Agile/SDEL processes, and DevOps/tooling experience.
Java, JavaScript, Go, Python, TypeScript, .NET, Java Development Kit, Spring, Node.js, Gin, AngularJS, React, Next.js, NestJS, Google Web Toolkit, Hibernate, Struts, Git, GitLab, Terraform, Splunk, HashiCorp Vault, JIRA, Jenkins, Ansible, Amazon Web Services GovCloud, PostgreSQL, Amazon RDS, Keycloak, OIDC, SAML, Microsoft Windows Server, Linux
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4d
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Senior Systems Developer (Angular)
Frederick or California or Colorado or Illinois or Minnesota or New Jersey or New York or Oregon or Washington or United States
RemoteFull Time
Syms Strategic Group
Syms Strategic Group: Provides IT and professional services to federal government agencies.
8+ YOE8+ years building backend services and RESTful APIs with Java or NodeJS, hands-on Angular and cloud (AWS/Azure) experience, healthcare EDI knowledge, Public Trust clearance eligibility, and U.S. citizenship.
Angular, Java, NodeJS, C#, .Net, TypeScript, AWS, Azure, API Gateway, Lambda, S3, CloudWatch, Docker, ECS, EKS, Git, GitHub, JIRA, JUnit, Jest, Microsoft Teams, RESTful APIs, Electronic Data Interchange (EDI), XML, JSON
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4d
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Senior Systems Developer (Angular)
Hagerstown or United States
$85k-$117k/yr RemoteFull Time
Syms Strategic Group
Syms Strategic Group: Provides IT and professional services to federal government agencies.
8+ YOE8+ years building backend services and RESTful APIs with Java/NodeJS, Angular front-end experience, AWS cloud skills, Git/GitHub, unit/integration testing, strong communication and healthcare data familiarity.
Java, NodeJS, Angular, C#, .Net, AWS, Azure, API Gateway, Lambda, S3, CloudWatch, Git, GitHub, JUnit, Jest, Docker, ECS, EKS, JIRA, Microsoft Teams, JavaScript, TypeScript, XML, JSON, Electronic Data Interchange X.12 (EDI)
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1mo
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Senior Full Stack AI Engineer
Jacksonville or Iselin or Washington
$110k-$190k/yr OnsiteFull Time
Fortegra
Fortegra: Provides specialty insurance products and warranty service solutions.
7+ YOE7+ years software engineering, expert React, backend framework experience (Node.js, Python, .NET Core), secure public-facing app and cloud architecture experience, hands-on use of AI coding tools and agentic workflows.
React, Node.js, NestJS, Express, Python, FastAPI, Django, Microsoft .NET Core, AWS, Microsoft Azure, GCP, Claude Code, GitHub Copilot, Cursor, Replit, Lovable
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2w
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Full Stack Developer - Tech Dev (TS/SCI Required)
Washington or Reston
$165k-$185k/yr OnsiteFull Time
Kentro
Kentro: Provider of digital and IT services for federal agencies.
7+ YOE7+ years software development; bachelor’s degree or associate with 10+ years; full‑stack frontend and backend experience; strong SQL and DB skills; Git experience; active TS/SCI clearance and CI polygraph capability.
.NET, .NET Core, C#, Python, JavaScript, TypeScript, HTML, CSS, React, Angular, Vue.js, Node.js, SQL, Oracle, SQL Server, MySQL, Dynamo, Postgres, MongoDB, Gitlab, GitHub, Git, DevSecOps, YAML, Data Bricks, Jupyter Notebook, Atlassian, UI Path
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1mo
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Staff Software Engineer in Test
Budapest or New York City or Washington or Vancouver or London or Galway or Munich or Bengaluru or Singapore or Sydney
HybridFull Time
Diligent
Diligent: Provides software for corporate governance, risk, and compliance management.
5+ YOE5+ years in test engineering, strong TypeScript and Playwright experience, API/backend testing, CI/CD (GitHub Actions), AWS/serverless and DevOps familiarity, LLM/AI testing knowledge, strong communication and mentoring skills.
TypeScript, Playwright, AWS CDK, AWS serverless services, GitHub Actions, .NET, Angular, Docker, LLMs
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