Senior C# Developer

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

• 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.

• 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).

Recruitment Transparency Notice

Eliassen Group values transparency in our recruitment practices. Please be advised that Eliassen Group utilizes artificial intelligence (AI) tools as part of its initial application screening and hiring process. You may receive email and SMS notifications from the Eliassen Virtual Recruiting Team ( [email protected] , 781-808-2924) inviting you to complete a brief voice screening as part of your application process. These tools assist our hiring teams in different ways, including but not limited to, assistance in reviewing application materials to help identify candidates whose qualifications most closely match the requirements of the position. All AI-assisted evaluations and responses are reviewed by human recruiters before any hiring decisions are made. The use of AI in our process is intended to support fairness, efficiency, and consistency, and Eliassen Group takes measures to prevent bias or discrimination in connection with its hiring practices. By proceeding, you acknowledge, agree, and consent to Eliassen Group’s use of these tools, including AI tools, as part of the application and hiring process.

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.

· 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 [email protected] .

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.

Don’t miss out on our referral program! If we hire a candidate that you refer us to then you can be eligible for a $1,000 referral check!