Senior Software Engineer - .NET (Full Stack)
$113,600–$171,575 year
HybridDenver, Colorado, United States or Cincinnati, Ohio, United States
Job Summary
Design and maintain full-stack web applications using C#, ASP.NET Core, .NET, SQL Server, and modern JavaScript frameworks. Lead application modernization initiatives by migrating large-scale legacy .NET Framework 4.x applications to .NET Core/.NET, driving cloud-ready architectures and improved performance. Develop and maintain RESTful APIs, backend services, and integrations with internal and external systems while creating reusable UI components and libraries. Execute unit, integration, and automated tests to ensure application quality and reliability. Participate in code reviews, technical design sessions, and sprint planning activities. Troubleshoot and resolve application defects, production issues, and performance bottlenecks. This role supports the Launchpad team, which streamlines merchant onboarding for the Worldpay platform. Hybrid schedule available in Cincinnati, OH or Denver, CO.
Required Qualifications
- US Citizen or valid Green Card Holder
- Bachelor's degree in computer science, Engineering, Information Systems, or equivalent practical experience
- 8+ years of software development experience in enterprise application environments
- 6+ years of hands-on C# development experience with deep expertise in .NET Framework, ASP.NET MVC, ASP.NET Web API, ASP.NET Core, and modern .NET platforms (.NET Core/.NET 8+)
- Proven experience leading application modernization initiatives, including large-scale migrations from .NET Framework 4.x to .NET Core/.NET, enabling cloud-ready, scalable, and maintainable solutions
- Strong frontend development experience using JavaScript, TypeScript, HTML5, CSS3, and modern frameworks such as Vue.js, React, or Angular, including building and consuming RESTful APIs
- Extensive knowledge of Entity Framework, LINQ, SQL Server, relational database design, authentication, authorization, and web security best practices
- Proficiency with Git, CI/CD pipelines, DevOps practices, automated testing (unit and integration), and code quality/security tools including Snyk, Checkmarx, and BlackDuck
- Strong technical leadership, analytical problem-solving, and communication skills, with experience mentoring engineers and delivering solutions in Agile development environments
- Must be a US Citizen or valid Green Card Holder
- Must be available for hybrid work in Cincinnati, OH (3 days) or Denver, CO (2 days)
- Must be able to undergo a drug test
Desired Qualifications
- Acts like an owner by taking initiative, driving outcomes independently, and proactively engaging stakeholders to ensure successful delivery
- Demonstrates curiosity and continuous learning, quickly acquiring new technical and business knowledge to make informed decisions and add value
- Collaborates effectively across teams, seeking clarity when needed, sharing knowledge openly, and helping the broader team succeed
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