Isekai Machikouba Musou: Shinrai to Jisseki no Isekai Seifuku

The largest-scale isekai work yet! An entire local factory is transported to another world. Veteran engineers working at a local factory use their technical skills and knowledge to conquer another world!? As the battle between the human army and the Demon King's army intensifies, the first site the engineers arrive at is the Demon King's castle's ultra-black weapons factory! To save the oppressed goblins, Japanese corporate warriors start a revolution!! The closest thing to God in this world is... an engineer! This is the beginning of a technology fantasy set in another world!

(Source: Kodansha, translated)