Senior .NET Backend / API Integration Engineer – Conversational AI Orchestration | QC

We are looking for an experienced, self-driven Senior .NET Backend / API Integration Engineer for a healthcare conversational AI program in an Agile / AIDLC working client environment.

The successful candidate will lead the design, development, and maintenance of backend services and the orchestration layer that routes provider calls between authentication, multiple third-party voice and AI agents, and live-agent escalation.

Primary Responsibilities

- Own the technical design of backend services and the orchestration layer using ASP.NET Core, C#, and Entity Framework.

- Build and maintain an orchestration and routing layer that manages several voice and AI agents, including hand-offs within a single call.

- Design, develop, secure, and maintain RESTful APIs for internal and external integrations.

- Integrate with third-party conversational AI and voice platforms, contact center/IVR systems, and enterprise healthcare platforms.

- Develop and support API authentication and authorization.

- Provide technical leadership by guiding and mentoring engineers, setting coding standards, and leading code reviews.

- Work with Architects on solution design, technical decisions, and estimates.

- Write clean, scalable, well-documented code that follows best practices.

- Collaborate with Product Owners, QA Engineers, Architects, DevOps, and contact center business teams.

- Drive unit testing and continuous integration practices.

- Troubleshoot and resolve complex production issues and improve performance.

Must-Have Qualifications

- College graduate.

- 8+ years of software development experience using .NET technologies, with a strong backend focus.

- Hands-on experience with Agile/Scrum and the AI-Driven Development Lifecycle (AIDLC), using AI-assisted tools in the client's environment.

- Proficiency in C#, ASP.NET Core, Web API, and Entity Framework.

- Strong hands-on experience in API development, API integration, and microservices architecture.

- Proven experience designing orchestration or routing layers that coordinate multiple services or agents.

- Experience designing and consuming RESTful APIs, webhooks, and real-time or streaming interfaces (e.g., WebSockets).

- Knowledge of API security standards, including OAuth 2.0, JWT, authentication, and authorization.

- Experience leading or mentoring development teams and owning technical delivery.

- Basic understanding of AI concepts and AI-powered applications – GitHub Copilot, Claude, etc.

Nice-to-Have Qualifications

- Contact center or IVR integration experience (call transfer, caller authentication, live-agent escalation).

- Experience consuming LLM or AI agent APIs and applying guardrails (e.g., Azure OpenAI, Semantic Kernel).

- Event-driven integration using Azure Service Bus, Kafka, or similar.