Senior .NET Lead: Modernization & APIs (Remote)

Eliassen Group; Lansing (MI); Remote; USD 96,000 - 107,000; Full time

Job summary

Eliassen Group is seeking a Lead .NET Developer for a contract-to-hire engagement. This remote role supports a large modernization program to replace legacy mainframe applications with modern .NET services and APIs.

You will lead backend development, influence solution design, and guide transitions to event-driven architectures while mentoring other developers across enterprise platforms.

Qualifications

• Strong hands-on .NET/C# development experience.
• Advanced experience building REST APIs and backend services.
• Strong experience with Kafka and event-driven architecture.
• Experience with schema design tools like Apicurio or similar.
• Strong enterprise application development background.
• Experience designing integrations across multiple systems.
• Experience building and supporting production-grade applications.
• Ability to translate legacy logic into modern services with leadership guidance.

Responsibilities

• Lead design and development of backend services and REST APIs using .NET/C#.
• Drive modernization of legacy mainframe applications into modern .NET services.
• Translate existing 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 establish development best practices.
• Partner with engineering teams on architecture, design decisions, and implementation.
• Support finance, payroll, data, and other critical integrations.
• Mentor developers and provide technical direction throughout modernization efforts.

Skills

.NET/C# development

REST APIs

Kafka

Event-driven architecture

Legacy modernization

Technical leadership

Job description

Eliassen Group is seeking a Lead .NET Developer for a contract-to-hire engagement. This remote role supports a large modernization program to replace legacy mainframe applications with modern .NET services and APIs.

You will lead backend development, influence solution design, and guide transitions to event-driven architectures while mentoring other developers across enterprise platforms.