Make the cultural changes needed, and the technical changes will flow through afterwards.
If you can't change the culture and get your boss(es) on board, then you will fail.
Right now, the business is likely "mostly happy" with things the way they are. They're getting their changes made (but not as quickly as they'd like). Their costs are low (3 junior devs, with just their laptops and a production server). Convince them that unless the changes you want are made, their business will become stagnant. Use phrases like "invest for future growth" and "protect the business' current investment in the product"
If you can't change the culture and get your boss(es) on board, then you will fail.
Right now, the business is likely "mostly happy" with things the way they are. They're getting their changes made (but not as quickly as they'd like). Their costs are low (3 junior devs, with just their laptops and a production server). Convince them that unless the changes you want are made, their business will become stagnant. Use phrases like "invest for future growth" and "protect the business' current investment in the product"