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

Work Setup: Pending confirmation – Please initially ask the candidate if they are amenable to a full onsite or hybrid setup.
Location: Quezon Avenue, Eton Centris, Manila
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)
Headcount: 1

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.

Application Process

Paper Screening → Level 1 Interview → Client Interview