Senior Software Engineer - .NET (Full Stack)

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

Benefits offered by this job

Bonus eligibility

Job summary

Worldpay is seeking a Senior Software Engineer - .NET (Full Stack) to join the Launchpad team and help shape global commerce. You will design and build full-stack applications using C#, ASP.NET Core, .NET, SQL Server, and modern JavaScript frameworks.

You will lead modernization initiatives, migrate large-scale .NET Framework apps to .NET Core/.NET, develop RESTful APIs, implement tests, and collaborate with UX/UI, product owners, and engineers to deliver scalable solutions.

Qualifications

• 8+ years of software development experience in enterprise environments.
• 6+ years of hands-on C# development with .NET Framework, ASP.NET MVC, ASP.NET Web API, and .NET Core/.NET 8+.
• Experience leading modernization initiatives including large migrations to cloud-ready .NET platforms.
• Strong frontend skills with JavaScript/TypeScript and modern frameworks (Vue.js, React, or Angular).
• Experience securing applications and using DevOps practices and tooling.

Responsibilities

• Design, develop, and maintain full-stack web apps using C#, ASP.NET Core, and modern JS frameworks.
• Lead application modernization, migrating large-scale .NET Framework apps to .NET Core/.NET 8+.
• Develop and maintain RESTful APIs and integrations with internal/external systems.
• Create reusable UI components and libraries to improve efficiency.
• Write and execute unit/integration tests and participate in code reviews and sprint planning.

Skills

C# development

ASP.NET Core

JavaScript

RESTful APIs

Frontend frameworks

Git & CI/CD

Mentoring

Agile methodologies

Problem solving

Cloud/DevOps

Education

Bachelor’s degree in computer science or equivalent

Tools

Snyk

Checkmarx

BlackDuck

Git

CI/CD pipelines

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.

Launchpad is a Worldpay application designed to streamline merchant onboarding. It collects all necessary merchant details, enabling businesses to quickly start accepting credit card payments and settle transactions on the Worldpay platform. Launchpad includes both a user-friendly UI and robust API components to support seamless integration.

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.

Then you sound like a Globalpayer.

EEOC Statement

Worldpay is an equal opportunity employer. We evaluate qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, marital status, genetic information, national origin, disability, veteran status, and other protected characteristics. The EEO is the Law poster is available here.

If you are made a conditional offer of employment and will be working in the United States, you will be required to undergo a drug test.

Reasonable accommodations will be provided for individuals with qualified disabilities both during the hiring process, as well as to allow the individual to perform the essential functions of the job, if hired.

Compensation

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 experience, job‑related skills, and relevant education or training. Please note that changes in work location may impact the final offered salary. We encourage you to consult with your recruiter to confirm the budget for your location and to better understand the applicable pay scale. This position is eligible for bonus.