Job Opening: Senior .NET Backend & API Integration Engineer

Role Overview

We are looking for a highly skilled Senior .NET Backend & API Integration Engineer to drive the development of backend systems and integration architecture for a healthcare Conversational AI program.

The successful candidate will take ownership of designing and delivering scalable backend services and intelligent orchestration solutions that connect authentication systems, multiple AI and voice agents, third-party platforms, and live-agent support workflows.

Location: Eton Centris, Quezon Avenue, Manila
Work Arrangement: Pending confirmation – Candidates must be amenable to full onsite or hybrid work.
Work Schedule: Mid to Night Shift, with a minimum of 2 hours of daily overlap with US Central Time (CST).
Salary Budget: Up to PHP 150,000
Experience Required: 8+ years (Non-negotiable)

Key Areas of Responsibility

• Backend Engineering: Design, develop, and maintain scalable backend applications and services using C#, ASP.NET Core, and Entity Framework.

• AI Orchestration: Develop and manage orchestration and routing mechanisms that coordinate multiple conversational AI and voice agents, including seamless handoffs during customer interactions.

• API Development & Integration: Build, secure, and maintain RESTful APIs, microservices, webhooks, and integrations with internal and external platforms.

• Platform Connectivity: Integrate third-party AI and voice solutions with contact center, IVR, and enterprise healthcare systems.

• Security Implementation: Establish and maintain secure authentication and authorization mechanisms across API integrations.

• Technical Leadership: Mentor development teams, establish coding standards, conduct code reviews, and oversee technical delivery.

• Solution Architecture: Partner with Architects to evaluate technical approaches, define solutions, and provide development estimates.

• Engineering Collaboration: Work closely with Product Owners, QA Engineers, DevOps, and business stakeholders to deliver technical solutions.

• Quality & Performance: Drive unit testing, continuous integration, production troubleshooting, and backend performance optimization.

Required Technical Expertise

• College graduate with at least 8 years of professional software development experience, specializing in .NET backend technologies.

• Strong hands-on proficiency in C#, ASP.NET Core, Web API, and Entity Framework.

• Practical experience with Agile/Scrum methodologies and AI-Driven Development Lifecycle (AIDLC).

• Experience using AI-assisted development tools within a professional engineering environment.

• Strong background in API development, enterprise integration, and microservices architecture.

• Proven ability to design orchestration or routing layers involving multiple services, systems, or AI agents.

• Experience with RESTful APIs, webhooks, WebSockets, and real-time or streaming integrations.

• Knowledge of API security practices, including OAuth 2.0, JWT, authentication, and authorization.

• Previous experience providing technical leadership, mentoring developers, and taking ownership of engineering deliverables.

• Working knowledge of AI concepts and AI-powered applications, including GitHub Copilot and Claude.

Preferred Technical Background

• Integration experience with contact center and IVR platforms, particularly call routing, call transfers, caller authentication, and live-agent escalation.

• Experience integrating Large Language Models (LLMs) and AI agent APIs.

• Familiarity with Azure OpenAI, Semantic Kernel, and AI guardrails.

• Experience with event-driven architecture and messaging technologies such as Azure Service Bus and Kafka.