Senior C# Developer
Rockaway Township, NJ
Category: Development
Industry: Insurance
Reference ID: JN -042026-106231
Date Posted: 04/01/2026
Shortcut: http://careers.eliassen.com/k10anw
Description:
Hybrid Tues/Wed/Thurs Onsite in Rockaway Township, NJ
The organization seeks a senior backend engineer to support and enhance business-critical production applications within a C#/.NET environment. The role will design and maintain secure, scalable APIs and services, integrate with SQL Server, and work with complex business logic and workflows. Candidates must demonstrate deep .NET Core expertise, secure coding practices with OAuth, and ownership of CI/CD in a Microsoft-centric stack. This position focuses on backend delivery with unit testing and collaboration with a separate QA team.
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: $70.00 to $80.00/hr. w2
Responsibilities:
- Support and enhance business‑critical production applications.
- Perform new development, enhancements, and maintenance within a C#/.NET environment.
- Work extensively with complex business logic and process‑driven workflows.
- Design, build, and maintain secure, scalable backend services and APIs.
- Write clean, maintainable, well‑tested code aligned with best practices.
- Perform unit testing and collaborate with a separate QA team for full application testing.
- Participate in code reviews, technical discussions, and solution design.
- Contribute to effort estimation, progress tracking, and demos.
- Quickly learn internal frameworks, standards, and development processes.
Experience Requirements:
- 7+ years of professional software development experience.
- Strong expertise in C# and .NET with deep hands‑on experience in .NET Core.
- Experience with older .NET frameworks for legacy systems.
- Proficiency in asynchronous programming.
- Experience developing RESTful APIs.
- Experience with SignalR.
- Strong experience integrating APIs with Microsoft SQL Server.
- Experience securing APIs and services using OAuth and secure coding practices.
- Comfort with a Microsoft‑centric technology stack.
- Experience with CI/CD pipelines and DevOps workflows, managing pipelines directly.
- Familiarity using AI‑assisted development tools (preferred).
Skills, experience, and other compensable factors will be considered when determining pay rate. The pay range provided in this posting reflects a W2 hourly rate; other employment options may be available that may result in pay outside of the provided range.
W2 employees of Eliassen Group who are regularly scheduled to work 30 or more hours per week are eligible for the following benefits: medical (choice of 3 plans), dental, vision, pre-tax accounts, other voluntary benefits including life and disability insurance, 401(k) with match, and sick time if required by law in the worked-in state/locality.
If anyone reaches out to you about an open position connected with Eliassen Group, please ensure that you are working directly with us by confirming the following:
· When you work with Eliassen Group, all email communication will come from an Eliassen.com address, never Gmail, Yahoo, etc.
· Eliassen Group will never ask you for personal information (home address, bank account, or check routing number) until you have worked with someone clearly associated with Eliassen Group.
If you have any indication of fraudulent activity, please contact fraud@eliassen.com.
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Eliassen Group is an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, gender identity, national origin, age, protected veteran status, or disability status. Eliassen Group’s Affirmative Action Plan (AAP) is available for inspection by any employee or applicant for employment upon request, during normal business hours of Monday through Friday, 8:30am to 5:30pm EST. Interested persons should contact Phaedra Wells at pwells@eliassen.com for assistance. It is unlawful in Massachusetts and Maryland to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.
Applicants with disabilities that believe they require an accommodation or assistance with a position, please email our HR team at hradmin@eliassen.com. This email inbox is designed exclusively to assist job seekers whose disability prevents them from being able to apply online. Emails sent for other purposes will not receive a response.
Please be advised that a number of fraudulent job postings have been released under the Eliassen Group brand.
Unfortunately, fraudulent job postings can happen. If anyone reaches out to you about an open position connected with Eliassen Group, never provide personal or financial information to anyone who is not clearly associated with Eliassen Group
If anyone seemingly from Eliassen Group has ever requested this personal information in the past or does so in the future, please contactInfoSec@eliassen.com.
Please ensure that you are working directly with us by confirming the following:
- When you work with Eliassen Group, all email communication will come from an Eliassen.com address, never Gmail, Yahoo, etc.
- Eliassen Group will never ask you for personal information (home address, bank account, or check routing number) until you have worked with someone clearly associated with Eliassen Group, as indicated above