- Centralized SSH public key management system: Development of a full centralized ssh public key management system providing authentication, authorization using Python, Flask, Redis, Active Directory- Automation development using Chef and Test Kitchen: Designed a workflow for Chef recipes development keeping then small and testable accross all enviroments, improving automation quality through tests and avoiding downtimes.- O.S private cloud image automation: Full automation of O.S images using packer.io for Walmart private Cloud.PaaS: Installed a Platform as a Service solution (Deis) to evolve development cycle at Walmart.Continuous Integration/Deployment: Development of an restricted shell to allow Continuous Deployment using Rundeck. Systems administration and troubleshooting to increase performance and stability of Walmart's build systems.Walmart Ecommerce post-purchase systems contributions: Design systems architecture with Development teams to support Walmart Ecommerce's post-purchase systems (Cart, Payment, Inventory Management, Promotion). High available Queueing systems using rabbitmq High available Caching systems using varnish, nginx, redis High available Hazelcast cluster (maps, queues) High available application servers using Jetty, Java (stateless webservices) Stress tests and monitoring analysis to overcame downtime avoiding financial loss and increase systems performance and availability. Production Deployments during the day without risksWalmart Argentina - LATAM Sites: walmartonline.com.ar, walmart.com.ar, superchangomas.com.ar, Hotsale.com.ar Responsible for designing and maintaining systems infrastructure, migrating legacy systems, applying hardening, security patches and monitoring Responsible for designing a high available Platform with performance and reliability in mind to support Walmart Argentina's Hotsale event (like Blackfriday), using opensource solutions: Nginx, Apache, PHP, Memcached and Mysql