HE - Backend Developer - 155

We are seeking a skilled Backend Developer to lead the modernization of our legacy SOAP/WCF APIs to modern REST-based services. This role involves architecting and developing scalable .NET Core solutions while maintaining backward compatibility with existing systems.

Responsibilities

• API Modernization & Development
• Lead the migration of legacy SOAP and WCF services to REST APIs using .NET Core
• Design and implement REST adapter layers to translate between modern REST endpoints and legacy WCF/SOAP services
• Develop comprehensive OpenAPI specifications for all new REST services
• Build robust file-based interface translation mechanisms
• Ensure seamless integration with existing Supply Chain Management (SCM) systems
• Team Lead Qualities
• Experience leading development teams. Ideally, API projects.
• Team-oriented with a team perspective - able to supervise other developer’s work, help who is struggling and escalate issues when needed.
• Work on administrative tasks, such as documentation.
• Architecture & Design
• Architect scalable microservices using .NET Core and RESTful principles
• Design and implement authentication and authorization using OAuth 2.0 and MFA
• Build secure access token propagation mechanisms across services
• Create adapter patterns to bridge modern REST clients with legacy backend systems
• Establish clear API versioning and deprecation strategies
• Integration & Collaboration
• Coordinate with Presidio IVR systems for seamless integration
• Work closely with internal teams already familiar with OAuth implementations
• Support integration testing efforts across multiple system boundaries
• Collaborate with DevOps team for smooth CI/CD pipeline integration

Requirements

• Core Technologies
• 7+ years of experience with C# and .NET Framework/.NET Core
• Strong expertise in RESTful API design and implementation
• Deep understanding of SOAP and WCF services architecture
• Experience with OpenAPI/Swagger specification development
• Proficiency in Entity Framework Core or similar ORM technologies
• Security & Authentication
• Hands-on experience with OAuth 2.0 and OpenID Connect
• Implementation of Multi-Factor Authentication (MFA) systems
• Knowledge of JWT tokens and secure token propagation
• Understanding of API security best practices and transit security
• System Integration
• Experience with legacy system modernization projects
• Knowledge of adapter pattern implementation
• File-based interface development and translation
• IVR system integration experience (Presidio preferred)
• Understanding of enterprise integration patterns
• Preferred Qualifications
• Bachelor's degree in Computer Science or related field
• Experience with cloud platforms (Azure)
• Knowledge of containerization technologies (Docker, Kubernetes)
• Familiarity with message queuing systems (RabbitMQ, Azure Service Bus)
• Experience with API gateway solutions
• Experience with Finance.