• Lead the design and development of scalable backend systems that support enterprise applications and integrations. • Architect, build, and maintain RESTful and event-driven APIs for internal and external consumers. • Design abstraction layers that expose functionality from legacy systems in a secure, modern, and reusable manner. • Develop middleware services to translate, normalize, and orchestrate data between legacy platforms and modern applications. • Integrate with legacy systems using available interfaces such as SOAP, REST, JDBC/ODBC, message queues, flat files, or proprietary APIs. • Build API gateways and service layers that handle authentication, rate limiting, logging, and monitoring. • Design and implement data transformation logic to map legacy schemas to modern domain models. • Develop asynchronous processing pipelines using queues, event streams, or batch processing frameworks. • Optimize backend services for performance, scalability, reliability, and fault tolerance. • Implement caching strategies and database performance tuning techniques. • Create robust error-handling and retry mechanisms for unstable or high-latency legacy endpoints. • Ensure secure integration using OAuth2, JWT, mutual TLS, SAML, or other enterprise authentication mechanisms. • Work closely with enterprise architects and infrastructure teams to modernize legacy integration patterns. • Participate in system decomposition initiatives, including incremental migration from monoliths to microservices. • Write comprehensive unit, integration, and contract tests to ensure API reliability. • Document API specifications using OpenAPI/Swagger or similar standards. • Implement logging, tracing, and monitoring using observability tools. • Support CI/CD pipelines for automated builds, deployments, and environment promotion. • Troubleshoot production issues related to system integration, performance bottlenecks, or data inconsistencies. • Mentor junior developers on integration patterns, clean architecture, and backend best practices.