About The Company Jobrapido is supporting a client undertaking a large-scale modernization of critical enterprise applications. The initiative is focused on replacing legacy mainframe functionality with modern .NET-based services and APIs that can support evolving business needs. The engineering environment includes shared enterprise repositories, established development standards, and integrations with internal and third-party platforms. This is a remote opportunity available to candidates located in Arizona, Connecticut, Massachusetts, Missouri, New Jersey, New York, Florida, Vermont, Virginia, Texas, or Wisconsin. About The Role The client is seeking experienced .NET Developers to contribute to a contract-to-hire modernization initiative. In this role, you will build backend services, REST APIs, and event-driven applications while helping translate existing mainframe business logic into maintainable modern solutions. You will work closely with engineering teams to create scalable services and integrations for critical enterprise systems. The work may include finance-related services, payroll workflows, and data integrations. This is a W-2 contract-to-hire opportunity. Applicants must be willing and able to work on a W-2 basis during the contract and convert to a full-time employee following the contract duration. The hourly rate is $65.00 to $75.00 on a W-2 basis, depending on qualifications and experience. Job reference: JN-102026-109023.

Qualifications

Applicants should have strong hands-on experience developing with .NET and C#, along with a track record of building REST APIs and backend services. A solid understanding of enterprise application development and experience integrating multiple applications or systems are essential. Candidates should have experience developing and supporting production-grade applications and be comfortable working within shared code repositories and established engineering practices. You should be able to review existing application logic, understand business requirements, and translate legacy functionality into modern services. Mid-level to senior development experience is expected, along with clear communication and the ability to collaborate effectively with other engineers. Preferred experience includes Kafka, event-driven architecture, event sourcing, messaging architectures, event consumers and publishers, consumer-driven services, and third-party integrations. Experience with finance or payroll applications, platforms such as Salesforce, Concur, or OneStream, or legacy and mainframe modernization projects is advantageous. Familiarity with Apicurio is also beneficial. An interest in AI and large language models is a plus, but is not required.

Responsibilities

Design, develop, test, and support backend services and REST APIs using modern .NET and C#. Build replacement services that contribute to the broader mainframe modernization effort, using existing code and documentation as references for business logic. Develop event-driven services, message consumers, and publishers, and support reliable communication between applications. Create and maintain integrations with enterprise and third-party systems. Contribute to finance-related services, APIs, payroll workflows, and data integrations as assigned. Follow established development standards, work within shared enterprise repositories, and collaborate with engineering teams to deliver scalable solutions for critical applications. Support production-grade software through thoughtful implementation, troubleshooting, and ongoing improvements.

Benefits

W-2 consultants are offered a benefits package that includes medical, dental, and vision coverage, a 401(k) plan with company matching, and life insurance. This role offers remote work for candidates located in the eligible states listed above. The position is structured as contract-to-hire, with the expectation of conversion to full-time employment after the contract period. Equal Opportunity Jobrapido and its client are committed to providing equal employment opportunities. Applicants will be considered without discrimination based on any legally protected status. Hiring decisions are based on role-related qualifications, experience, and business requirements.