Architect and build scalable backend platforms using modern technologies (C#/.NET Core). Design and evolve system architecture, applying microservices, DDD, and event-driven patterns. Lead API design (REST, GraphQL, message-driven) for efficient service communication and integration. Implement observability practices (logging, tracing, metrics) for distributed systems. Mentor team members in architectural thinking, code quality, and best practices. Collaborate with stakeholders to translate business goals into long-term architectural roadmaps. Optimize performance and scalability using serverless, edge computing, and caching strategies. Drive DevOps excellence — CI/CD pipelines, containerization (Docker/Kubernetes), and cloud-native deployments (AWS/Azure/GCP).