Senior Software Engineer, .NET & WCF Modernization

Position Overview The Senior Software Engineer, .NET & WCF is responsible for supporting, enhancing, and modernizing a portfolio of business-critical .NET Framework and WCF-based applications. This role combines hands-on development, production support, technical leadership, and modernization planning to ensure legacy platforms remain stable, secure, and scalable while evolving toward modern .NET and cloud-ready architectures. The successful candidate will work closely with Product, QA, DevOps, and Architecture teams to maintain existing services, resolve complex technical issues, improve performance, and lead the gradual transformation of legacy applications into modern API-driven solutions. Key Responsibilities Legacy Application Support & Enhancement Support, maintain, and enhance existing .NET Framework and WCF-based applications and services. Diagnose and resolve complex production and application issues across multiple environments. Analyze system behaviour, logs, and performance metrics to identify root causes and implement fixes. Develop new functionality within existing applications while maintaining system stability and backward compatibility. Participate in on-call support and critical incident resolution activities as required. Document system behavior, integrations, technical dependencies, and support procedures. WCF Services & Integration Engineering Design, develop, and maintain WCF services supporting internal and external business processes. Support SOAP-based integrations and XML messaging frameworks. Troubleshoot service communication, security, serialization, and interoperability issues. Manage service contracts, endpoint configurations, bindings, and authentication mechanisms. Work with business and technical stakeholders to support enterprise integration requirements. Ensure integrations remain reliable, secure, and scalable. Modernization & Migration Initiatives Assess legacy applications and identify modernization opportunities. Develop phased migration strategies from WCF services to ASP.NET Core Web APIs and modern service architectures. Refactor legacy code to improve maintainability, performance, and testability. Modernize authentication, authorization, and service communication patterns. Support migration efforts from .NET Framework to modern .NET versions where appropriate. Evaluate technical debt, prioritize modernization efforts, and recommend implementation approaches. Application Development Develop and maintain applications using C#, .NET Framework, ASP.NET, ASP.NET Core, and related technologies. Build and enhance RESTful APIs supporting modernization initiatives. Implement secure, maintainable, and scalable software solutions. Apply software design principles including SOLID, dependency injection, and clean code practices. Contribute to application architecture and technical design discussions. Database Development & Performance