.NET C# Developer

Cayuse Holdings; Washington (District of Columbia); On-site; USD 140,000 - 142,000; Full time

Benefits offered by this job

Medical, Dental and Vision Insurance

Flexible Spending Accounts

Disability insurance

Life Insurance (Company Provided)

401(k) Retirement Savings Plan with (M

Paid Time Off

Job summary

Cayuse Holdings seeks a C# .NET Developer to contribute to web applications and services for mission-critical federal operations. You will work hands-on with the .NET framework to build back-end components that integrate with front-end and cloud-based systems, collaborating with senior engineers and cross-functional teams to deliver secure, high-quality software.

Requirements include a TS security clearance, strong C#/.NET experience, and a history of working in a regulated or government

Qualifications

• Bachelor’s degree in IT/CS/Engineering or related field; OR 8+ years of relevant experience in lieu of degree.
• 3–5 years of professional experience designing and developing software using C#/.NET.
• Hands-on experience with ASP.NET, Entity Framework, and SQL Server.
• Familiarity with architectural patterns and API styles (REST/RPC).
• Experience writing and executing unit tests and performing integration tests.
• Understanding of secure coding practices and vulnerability remediation.
• Ability to collaborate with cross-functional teams and translate requirements into technical tasks.
• Active Top Secret Security Clearance is required.
• Must pass background checks as required by projects/clients.

Responsibilities

• Design, develop, test, and maintain features using C#, ASP.NET, EF, and SQL Server.
• Modify and enhance existing code for performance and maintainability.
• Integrate third-party components and APIs as needed.
• Participate in full SDLC from planning to deployment and support.
• Collaborate with architects to follow established patterns and standards.
• Write clean, scalable, maintainable code aligned with guidelines and security standards.
• Develop and execute unit and integration tests; support regression testing.
• Troubleshoot defects and performance issues, including database and service bottlenecks.
• Use Git/GitLab for source control and collaboration.
• Support operations and maintenance activities and production issues.
• Engage in code reviews and implement feedback for quality.

Skills

Problem solving

Communication

Urgent response

Microsoft tools

Adobe tools

Multi-tasking

Relationship building

Self-starter

Education

Bachelor’s degree in Information Technology, Computer Science, Engineering, or related field

8+ years of equivalent professional software development experience in lieu of a degree

Tools

ASP.NET

Entity Framework

SQL Server

REST/RPC APIs

Git/GitLab

CI/CD pipelines

Job description

Overview

The C# .NET Developer will contribute to the development, enhancement, and maintenance of web applications and services that enable mission‑critical operations in a federal environment.

This role will work hands‑on with the .NET framework and associated technologies to build clean, efficient, and reliable back‑end components that integrate seamlessly with front‑end and cloud‑based systems. You will collaborate closely with senior developers, architects, designers, product owners, and other cross‑functional stakeholders to deliver high‑quality software solutions that adhere to best practices, coding standards, and security requirements.

This position aligns with Cayuse’s core values of Innovation, Excellence, Collaboration, Adaptability, and Integrity by fostering technical solutions that meet customer needs, promoting teamwork, and prioritizing quality in deliverables.

Responsibilities

• Design, develop, test, and maintain application features usingC#, ASP.NET, Entity Framework, and SQL Server.
• Modify and enhance existing application code to improveperformance, functionality, and maintainability.
• Integratethird‑party components, services, and APIs(e.g., REST/RPC-based) as needed.
• Participate in thefull software development lifecycle (SDLC), including planning, requirements analysis, implementation, testing, deployment, and operations support.
• Collaborate withsenior developers and architectsto implement technical designs and follow established architectural patterns, coding standards, and design guidelines.
• Writeclean, scalable, and maintainable codealigned with team guidelines, industry best practices, and security standards.
• Develop and executeunit tests and integration teststo validate functionality, ensure code quality, and support regression testing.
• Troubleshoot and resolvetechnical issues, defects, and performance bottlenecks, including database and service-level performance.
• UseGit/GitLabfor source control, branching strategies, code reviews, and collaborative development workflows.
• Supportoperations and maintenance (O&M)activities, including minor enhancements, bug fixes, performance tuning, and production support as needed.
• Participate actively incode reviewsand incorporate feedback from senior engineers to continuously improve code quality and your technical proficiency.
• Assist inremediating code and package vulnerabilitiesidentified through automated scans and security reviews, following secure coding guidance and direction from senior team members.
• Other duties as assigned.

Qualifications

• Bachelor’s degreein Information Technology, Computer Science, Engineering, or a related field;
  • ORequivalent experience (e.g.,8+ years of relevant professional software development experiencein lieu of a degree).
• 3–5 years of professional experiencedesigning and developing software usingC# and the .NET framework.
• Hands‑on experience withASP.NET,Entity Framework, andSQL Server(queries, stored procedures, performance considerations).
• Familiarity witharchitectural patterns and API styles, includingRESTandRPC.
• Experiencewriting and executing unit testsand performingintegration testingwithin a structured SDLC.
• Understanding ofsecure coding practicesand a willingness to follow guidance for vulnerability remediation and security hardening.
• Demonstrated ability tocollaborate 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.
• Must be able to pass a background check. May require additional background checks as required by projects and/or clients at any time during employment.

Minimum Skills Required:

• Excellent problem-solving and analytical skills.
• Strong communication and interpersonal skills.
• Ability to respond effectively to customers with a sense of urgency.
• Proficient in Microsoft and Adobe toolsets, including Excel, Word, PowerPoint, Acrobat, etc.
• Highly motivated with the ability to handle and manage multiple tasks at any one time.
• Ability to forge new relationships, individual and teaming in nature.
• Must be a Self-starter, that can work independently and as part of a team.

Preferred Qualifications:

• Experience working in afederal governmentor regulated environment.
• Familiarity withDevSecOpspractices, CI/CD pipelines, and automated build/test tools.
• Experience withcloud platforms(e.g., Azure, AWS, or similar) and integrating .NET applications with cloud services.
• Exposure toAgilemethodologies (Scrum, Kanban) and related tools (e.g., Jira, Azure DevOps).
• Experience withstatic code analysisand vulnerability scanning tools.

Our Commitment to you / overview of benefits

• 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

Reports to: Program Manager

Working Conditions

• Professional office environment with the ability to work on‑site.
• Must be physically and mentally able to perform duties extended periods of time.
• Ability to use a computer and other office productivity tools with sufficient speed to meet the demands of this position.
• Must be able to establish a productive and professional workspace.
• Must be able to sit for long periods of time looking at computer screen.
• May be asked to work a flexible schedule which may include holidays.
• May be asked to travel for business or professional development purposes.
• May be asked to work hours outside of normal business hours.

Other Duties: Please note this job description is not designed to cover or contain a comprehensive list of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities, and activities may change at any time with or without notice.

Cayuse is an Equal Opportunity Employer. All employment decisions are based on merit, qualifications, skills, and abilities. All qualified applicants will receive consideration for employment in accordance with any applicable federal, state, or local law.

Pay Range

USD $140,000.00 - USD $142,085.00 /Yr.