Senior .NET Developer with Secret Clearance | Hybrid DC

Koniag Government Services; Washington (District of Columbia); Hybrid; USD 120,000 - 160,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

401(k)

Paid time off

Parental leave

Life insurance

Disability insurance

Flexible spending accounts

Commuter benefits

Tuition reimbursement

Job summary

Koniag Emerging Technologies, LLC, a Koniag Government Services company, seeks a Senior .NET Developer with a Secret clearance to support federal HR apps in Washington, DC. This hybrid role requires one day on-site per week and leads design, development, and maintenance across .NET, Angular, and Oracle.

The candidate will contribute to AI-assisted features and secure authentication, while supporting production systems under change control.

Qualifications

• Active Secret security clearance (U.S. citizenship required).
• Bachelor's degree in Computer Science or related field; 4 additional years of experience in lieu of degree.
• Minimum of 7 years of total software development experience, including at least 6 years in .NET development with strong proficiency in C#, ASP.NET (Web Forms, MVC, and Web API), and both .NET Framework and modern .NET.
• Experience designing and building enterprise ASP.NET Web APIs secured with OAuth 2.0 / OpenID Connect
• Working knowledge of Oracle databases and SQL, including ODP.NET or Entity Framework with Oracle
• Demonstrated experience building or integrating AI features in applications (LLM APIs, agents, or similar)
• Experience using Azure DevOps for Git source control, build and release pipelines, and deployments

Responsibilities

• Maintain, enhance and troubleshoot applications across the full stack: .NET Framework, ASP.NET Web API, Angular, and Oracle
• Develop and maintain enterprise ASP.NET Web APIs that serve the classification application and related HR applications
• Support integration with PeopleSoft HR data (organizational hierarchies, position and locality data)
• Maintain automated regression tests (e.g., Playwright) and technical documentation for the application stack
• Prepare Implementation guides and technical documentation
• Maintain and upgrade the Duende IdentityServer host, including OAuth 2.0 / OpenID Connect clients, scopes, and certificates
• Design and build AI-assisted applications in .NET, such as tools that analyze position descriptions and support classification determinations

Skills

Secret clearance

C#

ASP.NET Web API

Angular

Oracle

OAuth 2.0 / OpenID Connect

Duende IdentityServer

Azure DevOps

Playwright

GitHub Copilot

JavaScript

HTML

CSS

AI features

Education

Bachelor's degree in Computer Science or related field

4 additional years of experience in lieu of degree

Tools

GitHub Copilot

Azure DevOps

Playwright

ODP.NET / Entity Framework with Oracle

Duende IdentityServer

Job description

Koniag Emerging Technologies, LLC, a Koniag Government Services company, seeks a Senior .NET Developer with a Secret clearance to support federal HR apps in Washington, DC. This hybrid role requires one day on-site per week and leads design, development, and maintenance across .NET, Angular, and Oracle.

The candidate will contribute to AI-assisted features and secure authentication, while supporting production systems under change control.