Walter started his career at ArcelorMittal in 2014 as a Junior Research Engineer in the Global R&D department in Avilés, Spain. In 2016, he moved to Global R&D Maizières, France, where he worked as an R&D Engineer on research projects related to cold rolling, analyzing, optimizing, and implementing technical solutions for cold rolling mills across the group. From 2019 onwards, Walter transitioned to CMO Auto Packaging Electrical Steels at ArcelorMittal Flat Europe as a Customer Technical Support (CTS) engineer for Packaging. In October 2022, he expanded his responsibilities to include the role of Technical Coordinator for the Export Market.