.NET C# Developer

Cayuse Holdings

C# .NET Developer working on web applications and services for federal operations. Collaborating with cross-functional teams to deliver high-quality software solutions and adhere to best practices.

Posted 6/24/2026full-timeWashington • District of Columbia, Washington • 🇺🇸 United StatesMid-LevelSenior💰 $145,000 - $151,258 per yearWebsite

Tech Stack

Tools & technologies

ASP.NETEntity Framework.NETSDLCSQL

About the role

Key responsibilities & impact

Design, develop, test, and maintain application features using C#, ASP.NET, Entity Framework, and SQL Server.
Modify and enhance existing application code to improve performance, functionality, and maintainability.
Integrate third‑party components, services, and APIs (e.g., REST/RPC-based) as needed.
Participate in the full software development lifecycle (SDLC), including planning, requirements analysis, implementation, testing, deployment, and operations support.
Collaborate with senior developers and architects to implement technical designs and follow established architectural patterns, coding standards, and design guidelines.
Write clean, scalable, and maintainable code aligned with team guidelines, industry best practices, and security standards.
Develop and execute unit tests and integration tests to validate functionality, ensure code quality, and support regression testing.
Troubleshoot and resolve technical issues, defects, and performance bottlenecks, including database and service-level performance.
Use Git/GitLab for source control, branching strategies, code reviews, and collaborative development workflows.
Support operations and maintenance (O&M) activities, including minor enhancements, bug fixes, performance tuning, and production support as needed.
Participate actively in code reviews and incorporate feedback from senior engineers to continuously improve code quality and your technical proficiency.
Assist in remediating code and package vulnerabilities identified through automated scans and security reviews, following secure coding guidance and direction from senior team members.
Other duties as assigned.

Requirements

What you’ll need

Bachelor’s degree in Information Technology, Computer Science, Engineering, or a related field; OR equivalent experience (e.g., 8+ years of relevant professional software development experience in lieu of a degree).
3–5 years of professional experience designing and developing software using C# and the .NET framework.
Hands‑on experience with ASP.NET, Entity Framework, and SQL Server (queries, stored procedures, performance considerations).
Familiarity with architectural patterns and API styles, including REST and RPC.
Experience writing and executing unit tests and performing integration testing within a structured SDLC.
Understanding of secure coding practices and a willingness to follow guidance for vulnerability remediation and security hardening.
Demonstrated ability to collaborate with cross‑functional teams (e.g., product owners, testers, designers, operations teams) and translate functional requirements into well‑defined technical tasks.
Active Top Secret Security Clearance is required.

Benefits

Comp & perks

Medical, Dental and Vision Insurance
Wellness Program
Flexible Spending Accounts (Healthcare, Dependent Care, Commuter)
Short-Term and Long-Term Disability options
Basic Life and AD&D Insurance (Company Provided)
Voluntary Life and AD&D options
401(k) Retirement Savings Plan with matching after one year
Paid Time Off

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

C#.NET frameworkASP.NETEntity FrameworkSQL Serverunit testingintegration testingsecure coding practicesAPI integrationperformance tuning

Soft Skills

collaborationproblem-solvingcode reviewtechnical proficiencycommunicationadaptabilityattention to detailfeedback incorporationcross-functional teamworkwillingness to learn

Certifications

Bachelor’s degree in Information TechnologyBachelor’s degree in Computer ScienceBachelor’s degree in EngineeringTop Secret Security Clearance