Senior .NET Developer / 6 Month Contract / Hybrid / Downtown, Phoenix

This is one of the world's largest provider of IT infrastructure services, focused on designing, building, managing, and modernizing the mission-critical technology systems that businesses rely on every day. They partner with organizations across industries such as financial services, healthcare, manufacturing, and government to support complex hybrid cloud, mainframe, network, security, and enterprise application environments. The company helps clients improve reliability, scalability, and security while guiding large-scale digital transformation initiatives, including cloud migration, application modernization, and operational resilience. By combining deep technical expertise with industry knowledge, they enable organizations to reduce risk, optimize performance, and ensure their core systems can evolve alongside business needs.

They are seeking a Senior .NET Developer to join a team focused on building and modernizing enterprise-scale software applications that support mission-critical business operations. This role is ideal for an experienced engineer who thrives in complex environments, values clean architecture, and has a strong background in backend and web application development within the Microsoft ecosystem. Required Skills & Experience

• 5+ years of professional experience developing enterprise-level software applications
• Strong hands-on experience with .NET (C#) in large, production environments
• Proven experience with WebForms, Razor Pages, and MVC architecture
• Experience building and consuming APIs in distributed systems
• Solid experience with message queuing technologies (MQ)
• Strong SQL skills, including performance tuning and complex queries
• Experience working in AWS environments is a plus
• Familiarity with enterprise integration patterns and scalable system design
• Excellent problem-solving skills and ability to work in highly regulated or mission-critical environments

Preferred Skills & Experience

• Experience supporting legacy system modernization
• Exposure to cloud-native or hybrid architectures
• Background working in large, enterprise or consulting environments

What You Will Be Doing Tech Breakdown:

• 20% maintenance
• 80% new development

Daily Responsibilities:

• Design, develop, and maintain enterprise-level applications using .NET technologies
• Build and enhance web applications using WebForms, Razor Pages, and MVC architecture
• Develop and maintain RESTful APIs to support internal and external system integrations
• Work with message queues (MQ) to support asynchronous, high-throughput processing
• Design and optimize SQL-based data models and queries to support scalable applications
• Collaborate with cross-functional teams to gather requirements, design solutions, and deliver high-quality software
• Participate in code reviews, architectural discussions, and performance optimization efforts
• Support modernization initiatives, including cloud adoption and system enhancements

Office Location

• Downtown Phoenix, AZ
• Hybrid
• 3 days onsite // 2 days onsite

The Offer

• $60-70/hr
• 6 Month Contract Role (W2)

Applicants must be currently authorized to work in the US on a full-time basis now and in the future.