.NET Developer

Eliassen Group; Honolulu (HI); Remote; USD 90,000 - 103,000; Full time

Job summary

Eliassen Group is seeking experienced .NET developers to support a large-scale modernization initiative, replacing legacy mainframe applications with modern .NET-based services and APIs. You will focus on backend development, enterprise integrations, and event-driven applications, building scalable services that integrate with internal and third-party systems.

This contract-to-hire role involves W2 employment with benefits, and a path to full-time employment after the duration of the contract.

Qualifications

• Experience with .NET/C# backend development.
• Experience building REST APIs and backend services.
• Strong understanding of enterprise application development.
• Experience with integrations between multiple applications or systems.
• Experience developing and supporting production-grade applications.
• Ability to understand existing application logic and translate legacy functionality into modern services.
• Mid-level to senior development experience.
• Preferred: Kafka, event-driven architecture, event sourcing, messaging architectures, event consumers and publishers, consumer-driven services, third-party integrations, finance or payroll-related applications, integrations with platforms such as Salesforce, Concur, or OneStream, legacy or mainframe modernization initiatives, Apicurio.
• 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 and use it as reference when developing 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 the modernization of critical enterprise applications.

Skills

.NET/C# development

REST APIs

Enterprise app development

System integrations

Production-grade apps

Legacy modernization

Event-driven architecture

Kafka

APicurio

AI/LLM interest

Tools

Apicurio

Job description

.NET Developer

Anywhere

Type: Contract-to-Hire

Category: Development

Industry: Manufacturing

Workplace Type: Remote

Standard Hours: Open

Reference ID: JN -102026-109023

Date Posted: 10/11/2026

Shortcut: http://careers.eliassen.com/ZIYhXc

Description:

Remote

• Candidates must be located in these states: Arizona, Connecticut, Massachusetts, Missouri, New Jersey, New York, Florida, Vermont, Virginia, Texas and Wisconsin

Our client seeks experienced .NET Developers to support a large-scale modernization initiative replacing legacy mainframe applications with modern .NET-based services and APIs. You will focus on backend development, enterprise integrations, and event-driven applications. You will build scalable services that integrate with internal and third-party systems and collaborate with engineering teams to modernize critical enterprise applications.

This is a contract to hire opportunity. Applicants must be willing and able to work on a w2 basis and convert to FTE following contract duration. For our w2 consultants, we offer a great benefits package that includes Medical, Dental, and Vision benefits, 401k with company matching, and life insurance.

Rate: $65.00 to $75.00/hr. w2

JN -102026-109023

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 and use it as reference when developing 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 the modernization of critical enterprise applications.

Experience Requirements:

• Strong hands-on experience with .NET/C# development.

• Experience developing REST APIs and backend services.

• Strong understanding of enterprise application development.

• Experience working with integrations between multiple applications or systems.

• Experience developing and supporting production-grade applications.

• Ability to understand existing application logic and translate legacy functionality into modern services.

• Mid-level to senior development experience.

• Preferred: Kafka, event-driven architecture, event sourcing, messaging architectures, event consumers and publishers, consumer-driven services, third-party integrations, finance or payroll-related applications, integrations with platforms such as Salesforce, Concur, or OneStream, legacy or mainframe modernization initiatives, Apicurio. Interest in AI/LLM is a plus.

About Eliassen Group

Eliassen Group is a strategic consulting firm that helps organizations reach further and achieve more through our technology, business advisory, and life sciences solutions. For nearly 40 years, we have combined exceptional people, deep domain expertise, and intelligent capabilities to expand our clients’ capacity and accelerate meaningful outcomes. We are driven by a purpose to positively impact the lives of our employees, clients, consultants, and the communities we serve.

Eliassen is committed to building a diverse and inclusive team from a variety of backgrounds, perspectives, and skills. We are an Equal Opportunity and Affirmative Action Employer and all employment decisions are based on merit, performance, and business needs. Eliassen does not discriminate on the basis of race, color, gender identity or expression, sexual preference or orientation, sex (including pregnancy, childbirth, and related medical conditions), marital status, creed, religion, physical or mental disability, genetic information, military or veteran status, age, ancestry, national origin, citizenship status, prohibited criminal record inquiries of applicants and employees, or any other category protected by federal, state, or local laws.