Senior .NET Full Stack Developer (React)

We are looking for an experienced Senior .NET Full Stack Developer (React) to join our engineering team. In this role, you will design, develop, and support scalable enterprise applications with a strong focus on backend engineering while contributing to modern React-based user interfaces. Our ideal candidate has strong experience building secure, cloud-native microservices, enjoys solving production challenges, and thrives in Agile teams. Responsibilities Design, develop, and maintain scalable enterprise applications using C#, ASP.NET Core, React, and SQL Server following modern software architecture principles. Build and enhance secure RESTful APIs and microservices while ensuring high performance, scalability, and maintainability. Troubleshoot production issues, perform root cause analysis, implement preventive measures, and collaborate with DevOps teams to improve application reliability. Implement authentication and authorization using Keycloak (preferable) or similar tools like OAuth2, OpenID Connect, and JWT , ensuring enterprise-grade security. Collaborate with frontend developers, QA engineers, architects, and business stakeholders throughout the software development lifecycle using Agile/Scrum methodologies. Participate in technical design discussions, code reviews, mentoring junior developers, and driving engineering best practices across the team. Minimum Requirements (Mandatory) 6 years of experience in software development using C#, ASP.NET Core/.NET Core , and enterprise application development. Strong experience with React , TypeScript/JavaScript, RESTful API development, Microservices Architecture, Entity Framework Core, and SQL Server. Hands-on experience implementing authentication and authorization using Keycloak (preferable) or similar tools like JWT, OAuth2, and, OpenID Connect . Good understanding of application architecture, dependency injection, middleware, API versioning, logging, exception handling, and secure coding practices. Experience working with cloud platforms ( AWS or Azure ), Docker, Kubernetes, Git, CI/CD pipelines, and Agile/Scrum methodologies. Strong analytical and debugging skills with proven experience in production support, performance optimization, API troubleshooting, and database query optimization. Preferred Qualifications (Good to Have) Experience working in Automotive , Connected Vehicles , Industry 4.0 , IoT, or Manufacturing domains. Hands-on experience with messaging technologies such as MQTT , Kafka, RabbitMQ, or other event-driven architectures. Exposure to GraphQL, Terraform, Protobuf, container orchestration, and Infrastructure as Code. Knowledge of cloud monitoring, distributed tracing, observability, and production monitoring tools. Experience with performance tuning, high-volume messaging systems, and distributed application design. Prior experience mentoring developers, leading technical discussions, and contributing to architectural decisions. About Reply Reply specializes in the design and implementation of solutions based on new communication channels and digital media. Reply is a network of highly specialized companies supporting global industrial groups operating in the telecom and media, industry and services, banking, insurance and public administration sectors in the definition and development of business models enabled for the new paradigms of AI, cloud computing, digital media and the Internet of Things. Reply services include Consulting, System Integration and Digital Services.