Remote .NET Backend Engineer—Modernization & APIs

Eliassen Group; Madison (WI); Remote; USD 90,000 - 103,000; Part time

Job summary

Eliassen Group is seeking experienced .NET developers to support a large-scale modernization initiative. Focus areas include backend services, REST APIs, and integrations that replace legacy mainframe functionality with modern .NET-based services and APIs.

The role emphasizes designing scalable, enterprise-grade solutions, working with event-driven architectures, and collaborating with multiple teams to modernize critical applications.

Qualifications

• Proven experience with .NET/C# backend development.
• Experience building REST APIs and backend services.
• Strong understanding of enterprise application development.
• Experience integrating multiple applications or systems.
• Proven ability to translate legacy functionality into modern services.
• Mid-to-senior level development experience.
• Experience with Kafka, event-driven architectures, or related technologies is a plus.
• Interest in AI/LLM is a plus.

Responsibilities

• Design and develop backend services and REST APIs using modern .NET.
• Build replacement services as part of a legacy mainframe modernization effort.
• Review existing mainframe code to understand business logic for new solutions.
• Develop event-driven services, consumers, and publishers.
• Build and support integrations with enterprise and third-party applications.
• Contribute to finance-related services, APIs, payroll workflows, and data integrations.
• Work within shared enterprise repositories and established development standards.
• Collaborate with engineering teams on modernization of critical enterprise applications.

Skills

.NET/C# development

REST APIs

Enterprise app development

System integrations

Production-grade applications

Legacy modernization

Event-driven architecture

AI/LLM interest

Tools

Kafka

Apicurio

Salesforce

Concur

OneStream

Job description

Eliassen Group is seeking experienced .NET developers to support a large-scale modernization initiative. Focus areas include backend services, REST APIs, and integrations that replace legacy mainframe functionality with modern .NET-based services and APIs.

The role emphasizes designing scalable, enterprise-grade solutions, working with event-driven architectures, and collaborating with multiple teams to modernize critical applications.