Lead .NET Backend Architect — Remote Modernization

Eliassen Group; Phoenix (AZ); Remote; USD 96,000 - 107,000; Full time

Job summary

Eliassen Group is seeking a Lead .NET Developer to drive a large-scale modernization initiative, replacing legacy mainframe applications with modern .NET services and APIs. This is a hands-on technical leadership role focused on backend development and architecture guidance.

You will lead the translation of complex legacy business logic into scalable solutions, design event-driven services, and mentor teams across the modernization program.

Qualifications

• Strong hands-on .NET/C# development experience.
• Advanced experience building REST APIs and backend services.
• Experience with Kafka and event-driven architectures.
• Experience with schema design tools such as Apicurio.

Responsibilities

• Lead the design and development of backend services and REST APIs using .NET/C#.
• Drive modernization of legacy mainframe applications into modern .NET services.
• Translate legacy business logic into scalable, maintainable solutions.
• Design and build event-driven services, consumers, and publishers.
• Lead integrations across internal and third-party enterprise platforms.
• Provide technical guidance and help establish development best practices.
• Partner with engineering teams on architecture, design decisions, and implementation.
• Support finance, payroll, data, and other business-critical integrations.
• Mentor developers and provide technical direction throughout modernization efforts.

Skills

.NET/C#

REST APIs

Kafka

Event-driven

Technical leadership

Mentoring

Tools

Apicurio

Job description

Eliassen Group is seeking a Lead .NET Developer to drive a large-scale modernization initiative, replacing legacy mainframe applications with modern .NET services and APIs. This is a hands-on technical leadership role focused on backend development and architecture guidance.

You will lead the translation of complex legacy business logic into scalable solutions, design event-driven services, and mentor teams across the modernization program.