create an ecommerce with js / medusa.js / node.js... with front-end, back-end and admin panel for Brazil

-I need to create an ecommerce with Java, HTML and CSS with front-end, back-end and administration panel. need to connect with payment, shipping and ERP
-I want a system that is replicable but not a Saas
-I wish there was a front-end theme editor too

similar systems for inspiration:
https://www.yampi.com.br/
https://cartpanda.com/
https://www.posthaus.com.br/
https://www.tricommerce.com.br/