Desktop C# Developer (WPF) – Modernize Legacy Apps

VSolvit; Norco (CA); On-site; USD 100,000 - 130,000; Full time

Benefits offered by this job

Health benefits

401K Retirement Plan

Tuition Reimbursement

Life Insurance

Job summary

VSolvit is seeking a Software Developer to support modernization and sustainment of mission-critical Navy analysis applications. The role is 100% onsite in Norco, CA, working in an Agile SAFe environment to design, develop, test, and maintain desktop apps using C#, .NET, WPF, and XAML.

The candidate should have 3–10+ years of professional software development, strong WPF/XAML experience, and a background in modernizing legacy Delphi-based systems. U.S.

Qualifications

• 3–10+ years of professional software development experience.
• Strong proficiency in C# and .NET desktop development.
• Hands-on experience with WPF and XAML.
• Knowledge of OOP and design patterns.
• Experience with multi-threading, concurrency, and TPL.
• Familiarity with Test Driven Development.
• Experience with NUnit, xUnit, MSTest, or similar testing frameworks.
• Familiarity with Moq or similar mocking frameworks.
• Working knowledge of Git.
• Strong communication and teamwork skills.
• U.S. citizenship required.
• Ability to obtain and maintain a U.S. Government Security Clearance.
• If applicable, former or current U.S. Government employees must provide a post-employment ethics letter if offered employment.

Responsibilities

• Develop, test, and maintain desktop applications using C#, .NET, WPF, and XAML.
• Support modernization of legacy applications, including Delphi-based systems.
• Apply object-oriented design, multi-threading, concurrency, and asynchronous programming.
• Use Test Driven Development practices and create automated tests.
• Troubleshoot software defects and performance issues.
• Participate in code reviews, design discussions, sprint planning, and Agile ceremonies.
• Support CI/CD pipelines and technical documentation.
• Collaborate with engineers, testers, and government stakeholders.

Skills

C# & .NET

WPF & XAML

OOP & design patterns

Multi-threading

Git

Testing frameworks

Moq

Communication

Education

Bachelor’s degree in Computer Science

Tools

NUnit

xUnit

MSTest

Delphi

Job description

VSolvit is seeking a Software Developer to support modernization and sustainment of mission-critical Navy analysis applications. The role is 100% onsite in Norco, CA, working in an Agile SAFe environment to design, develop, test, and maintain desktop apps using C#, .NET, WPF, and XAML.

The candidate should have 3–10+ years of professional software development, strong WPF/XAML experience, and a background in modernizing legacy Delphi-based systems. U.S.