Senior Software Engineer - .NET (Full Stack)

worldpay; Denver (CO); Hybrid; USD 114,000 - 172,000; Full time

Job summary

Worldpay is seeking a Senior Software Engineer - .NET (Full Stack) to design, develop, and maintain enterprise web apps. You will lead modernization efforts, migrate large-scale .NET Framework apps to .NET Core, and craft cloud-ready, scalable solutions with frontend frameworks like Vue/React/Angular.

Strong skills in RESTful APIs, security, and Agile leadership are required. The role is hybrid, based in Denver or Cincinnati, and pays a salary in the global market range.

Qualifications

• 8+ years in enterprise software development.
• 6+ years C#/.NET with .NET Core/.NET 8+.
• Experience migrating large .NET Framework apps to .NET Core/.NET.
• Frontend with Vue/React/Angular and RESTful APIs.
• Secure, scalable software design and web security best practices.
• Mentor engineers in Agile development and code quality.

Responsibilities

• Design, develop, and maintain full-stack apps using C#, ASP.NET Core, and SQL Server.
• Build responsive frontend with modern JS frameworks and deliver end-to-end solutions.
• Develop RESTful APIs and integrations with internal/external systems.
• Create reusable UI components and shared services.
• Write unit/integration tests and participate in code reviews.
• Troubleshoot defects and optimize performance in production.

Skills

C# development

ASP.NET Core

Frontend JS/TS

RESTful APIs

Unit & integration tests

Git & CI/CD

Agile leadership

Education

Bachelor's degree in CS/Engineering

Tools

Entity Framework

LINQ

SQL Server

Git

CI/CD tooling

Snyk

Checkmarx/BlackDuck

Job description

This position is not eligible for visa sponsorship, now or in the future. Candidates must be a US Citizen or valid Green Card Holder.

This position is hybrid in the following office locations: Cincinnati, OH (3 days) or Denver, CO (2 days)

Ready to take your career global? Make your mark at one of the biggest names in payments. We're looking for a Senior Software Engineer - .NET (Full Stack) to join our ever-evolving Launchpad team and help shape the future of global commerce.

What you'll own

• Design, develop, and maintain full-stack web applications using C#, ASP.NET Core, .NET, SQL Server, and modern JavaScript frameworks, while leading application modernization initiatives, including the migration of large-scale legacy .NET Framework 4.x applications to .NET Core/.NET, driving cloud-ready architectures, improved performance, scalability, and long-term maintainability.
• Design and implement responsive, user-friendly frontend applications using JavaScript, TypeScript, HTML5, CSS3, and modern frameworks such as Vue.js, React, or Angular, while collaborating closely with UX/UI designers, product owners, architects, and cross-functional development teams to deliver high-quality end-to-end solutions
• Develop and maintain RESTful APIs, backend services, and integrations with internal and external systems.
• Create reusable UI components, libraries, and shared services to improve development efficiency and consistency.
• Develop and execute unit, integration, and automated tests to ensure application quality and reliability.
• Participate in code reviews, technical design sessions, architecture discussions, and sprint planning activities.
• Troubleshoot and resolve application defects, production issues, and performance bottlenecks.

What you'll bring

• Bachelor's degree in computer science, Engineering, Information Systems, or equivalent practical experience, with 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.

It's a bonus if you have

• 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.

About the team

Our inclusive and global teams win together every day. We're proud to have the best minds in the industry, who you can learn from as you grow your career. The people, the energy, the connections - it's unmatched. Come and be part of an ever-evolving company and get dynamic opportunities that go beyond borders.

What makes a Globalpayer?

Globalpayers think like a client, act like an owner and win as one team. We're curious and innovative - always finding better ways to deliver impact. We empower each other to make decisions, and it's our passion that drives excellence in everything we set out to do.

Worldpay is dedicated to offering individuals rewarding career opportunities and competitive compensation. For this full-time position, the good faith estimated annual salary range upon hire is $113,600.00-$171,575.00. This range reflects what we reasonably expect to offer based on the role's responsibilities, level, and geographic location. The actual starting salary will be determined by a candidate's experie