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

Work Shift: Mid to Night Shift, with at least 2 hours of daily overlap with US Central Time (CST)

Relevant Years of Experience: Minimum 8+ years (Non-negotiable)

Job Description

We're 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. You'll lead the design, build and maintenance of the backend services and orchestration layer that route 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: guide and mentor engineers, set coding standards and lead 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

- College Graduate.

- 8+ years of software development 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

- 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.