godan verb (-mu), transitive verb
make with great care; craft meticulously; produce with attention to detail
Emphasizes putting effort and detail into making something, often implying a thorough, well-finished result. Used for physical objects, food, software, etc.
この家具は職人が時間をかけて作り込んだものです。
This furniture was crafted with great care by the artisan over time.
彼
He meticulously built the game's world down to the smallest detail.
godan verb (-mu), transitive verb
build into; incorporate into the construction
Used when something is integrated or embedded into a larger structure during the making process, such as a feature built into a product or a shelf built into a wall.
壁に棚を作り込むことで、部屋がすっきりした。
By building shelves into the wall, the room became tidy.
このシステムにはセキュリティ機能が作り込まれている。
Security features are built into this system.