C# Backend-Focused Full Stack Engineer – Onsite Lewisville

Valiant Technologies LLC; Lewisville (TX); On-site; USD 100,000 - 150,000; Full time

Job summary

Valiant Technologies LLC in Lewisville, Texas is seeking an experienced C# Full Stack Developer focused on backend engineering. You will build scalable applications using C#, .NET Core/Framework, RESTful APIs, and Azure Cosmos DB, with ~85% backend focus.

You will collaborate with leads and architects on design, troubleshoot performance, and implement secure, reliable software in cloud environments, with opportunities for long-term career growth toward senior engineering or architecture roles.

Qualifications

• 5–6+ years of professional software engineering or full stack development experience.
• Strong hands-on experience with C#, .NET Core, and .NET Framework.
• Strong backend development expertise, with approximately 85% backend and 15% frontend responsibilities.
• Experience developing web applications and RESTful APIs.
• Experience with event-driven architectures, messaging, and service-based applications.
• Familiarity with Azure Cosmos DB and database integration.
• Cloud awareness and practical experience troubleshooting applications in cloud environments.
• Strong debugging, problem-solving, and root-cause analysis skills.
• Excellent communication skills and the ability to collaborate effectively with technical leads and architects.
• Proactive mindset, initiative, accountability, and interest in long-term professional growth.
• Ability to work onsite five days a week in Lewisville, Texas.
• Must be eligible to work on W2; US Citizen and Green Card candidates are preferred.

Responsibilities

• Design, develop, test, and maintain scalable applications using C#, .NET Core, and .NET Framework.
• Develop and maintain backend services, RESTful APIs, and web services.
• Build and support event-driven architectures and service-based applications.
• Work with Azure Cosmos DB and other database technologies to support application functionality.
• Troubleshoot complex application issues, identify root causes, and implement effective solutions.
• Monitor application performance, reliability, and scalability in cloud-based environments.
• Collaborate with technical leads and architects on software design, implementation, and technical improvements.
• Participate in code reviews, debugging, testing, and performance optimization.
• Follow secure coding practices and established software engineering standards.
• Work closely with cross-functional teams, including QA, product, and other engineering stakeholders.
• Proactively identify technical issues, recommend improvements, and take ownership of assigned tasks.

Skills

C#

.NET Core

RESTful APIs

Backend development

Event-driven

Azure Cosmos DB

Cloud troubleshooting

Unit testing

CI/CD

Git

DevOps

Tools

Azure Cosmos DB

Git

CI/CD pipelines

Job description

Valiant Technologies LLC in Lewisville, Texas is seeking an experienced C# Full Stack Developer focused on backend engineering. You will build scalable applications using C#, .NET Core/Framework, RESTful APIs, and Azure Cosmos DB, with ~85% backend focus.

You will collaborate with leads and architects on design, troubleshoot performance, and implement secure, reliable software in cloud environments, with opportunities for long-term career growth toward senior engineering or architecture roles.