At Winning Consulting we are looking for aSenior Backend Engineer (.NET / AWS)to join an international delivery team building and operating API-driven backend services.From SpainResponsibilitiesDesign, build and maintain backend services and APIs within theC#/.NET ecosystem(development, troubleshooting, debugging and service operations).Deliver and operate serverless workloads onAWS, contributing to solutions usingAPI Gateway, Lambda, DynamoDB and S3.Implement and maintainAPI securitypractices: authentication/authorization, middleware, secure configuration, secrets management and access controls.Contribute to reliable deployments and operational excellence throughInfrastructure as Code (Terraform).Ensure production readiness throughobservability and operations, usingCloudWatch logs, metrics and alarmsto monitor, troubleshoot and improve system reliability.Requirements5–7 yearsof experience in backend engineeringStrongC#/.NET API experience(drivers, services, debugging, troubleshooting).Solid understanding ofAPI design(REST principles, versioning, error handling, performance).Hands-on or strong fundamentals inAWS serverless(API Gateway, Lambda, DynamoDB; S3 is a plus).Experience with operational monitoring and incident troubleshooting usingCloudWatch logs/metrics/alarms.English fluent mandatory?? Sobre Winning ConsultingEn Winning Consulting, impulsamos la transformación de nuestros clientes mediante consultoría, formación, selección, y investigación. Aplicamos pensamiento científico y metodologías probadas para generar valor sostenible.?? Más info: