Java, Trading Networks, Axway, Exception handling and troubleshooting, REST SOAP integrations, UBL EN16931 Singapore e-Invoice standards, SFTP integration, SQL relational databases, Peppol e-Invoicing, PGP GPG encryption, API troubleshooting using Postman, Production Support, Software AG webMethods Integration Server, webMethods Designer, webMethods Adapter concepts, Control-M, Git CI CD, Flow Services, XML XSD UBL, Mapping and transformation, Windows batch scripting PowerShell