Lead .NET Architect - Remote, Modernization & APIs

Eliassen Group; Helena (MT); Remote; USD 96,000 - 107,000; Full time

Job summary

Eliassen Group is seeking a Lead .NET Developer for a remote contract-to-hire role focused on modernizing legacy mainframe systems into .NET services and APIs. You will lead backend development, influence architecture, and guide the transition to event-driven solutions.

The position requires strong hands-on .NET/C# skills, REST API design, and enterprise integration experience, with leadership responsibilities across engineering teams.

Qualifications

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

Responsibilities

• Lead the design and development of backend services and REST APIs using .NET/C#.
• Help drive the modernization of legacy mainframe applications into modern .NET services.
• Translate existing mainframe 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# development

REST APIs

Kafka

Event-driven architecture

Schema design (Apicurio)

Enterprise app development

System integration

Production-grade applications

Legacy modernization

Technical leadership

Tools

Apicurio

Job description

Eliassen Group is seeking a Lead .NET Developer for a remote contract-to-hire role focused on modernizing legacy mainframe systems into .NET services and APIs. You will lead backend development, influence architecture, and guide the transition to event-driven solutions.

The position requires strong hands-on .NET/C# skills, REST API design, and enterprise integration experience, with leadership responsibilities across engineering teams.