Location: St. Louis, MO
Salary: $65.00 USD Hourly - $75.00 USD Hourly
Description: Back-End & API Developer (C# / .NET Core)Location: Onsite - MSD, 2350 Market Street, St. Louis, MO
Anticipated Start Date: April 3, 2026
Contract Duration: 6 months (with option to extend)
OverviewThe project has completed its planning and design phases and will move into
Agile delivery starting November 2025, with execution continuing through
December 2026. Our client is using a
hybrid staffing model, where internal and vendor resources work side by side in a fully
onsite, collocated environment to ensure strong collaboration, knowledge transfer, and shared ownership of outcomes.
Role SummaryOur client is seeking a
Back-End & API Developer to support the design, development, and maintenance of scalable and secure back-end services and REST APIs. This role will collaborate closely with internal API developers and cross-functional Agile teams to support enterprise-grade applications and integrations.
Key Responsibilities- Design, develop, and maintain back-end services and REST APIs using C# and .NET Core
- Apply MVC and microservices architecture patterns
- Participate in Agile development processes, including sprint planning and execution
- Implement and optimize data structures in C# (.NET) such as Lists, Dictionaries, and Hashes
- Ensure scalability, performance, reliability, and security of APIs
- Support integration with Oracle Fusion / Oracle Integration Cloud (OIC) and other enterprise systems (as applicable)
- Collaborate closely with internal API developers and project stakeholders
Required Qualifications- 4-7 years of professional back-end development experience
- Strong hands-on experience with C#.NET, .NET Core, and REST API development
- Solid understanding of data model design and development
- Experience with enterprise integration and security best practices
- Familiarity with Agile development methodologies
Preferred Qualifications- Experience with database optimization and secure data handling practices
- Proficiency with Agile delivery tools such as Jira or Azure DevOps
- Relevant certifications (e.g., Microsoft Azure Developer, AWS Developer Associate) are a plus
Work Environment- Fully onsite role in St. Louis
- Collaborative, cross-functional Agile team environment
- Opportunity to contribute to a high-visibility enterprise system with long-term impact
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