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We are seeking an experienced Senior .NET Developer with Salesforce integration experience for an onsite contract role. This position focuses on developing and supporting enterprise applications using Microsoft technologies, integrating backend systems with Salesforce, and maintaining UI and batch processing components.
The ideal candidate is handson, technically strong, and comfortable working onsite with crossfunctional enterprise teams.
Key Responsibilities
Design, develop, and maintain .NET / .NET Core applications and APIs
Build and support Salesforce integrations using REST and SOAP APIs
Develop and maintain WPF desktop applications
Support and enhance SIS batch jobs and scheduled processing workflows
Work extensively with MS SQL Server (queries, stored procedures, performance tuning)
Implement secure authentication and authorization (OAuth 2.0, JWT, API keys)
Collaborate onsite with Salesforce developers, architects, and integration teams
Apply enterprise integration patterns (synchronous, asynchronous, eventdriven)
Troubleshoot and resolve application, integration, and data issues
Ensure code quality through reviews, testing, and adherence to standards
Create and maintain technical documentation
Required Skills & Experience:
8+ years of professional software development experience
5+ years handson experience with C#, .NET / .NET Core, ASP.NET Web API
Strong experience with MS SQL Server (TSQL, stored procedures, performance tuning)
Experience developing WPF applications
Handson experience supporting SIS batch jobs or similar batch/scheduled processing
Strong experience integrating with:
- REST and SOAP APIs
- OAuth 2.0 authentication
Solid understanding of enterprise integration patterns
Experience with cloud platforms (Azure preferred)
Strong problemsolving and communication skills
Ability and willingness to work onsite

EEO Employer

Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Employee Services Department at [email protected] or 844-463-6178.

Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click here for more details.

Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Apex team member can provide.