expression, godan verb (-mu)
build one's career; gain experience
Used when someone accumulates professional experience, skills, or achievements over time. Often implies deliberate effort and progression.
彼は外資系企業でキャリアを積んだ。
He built his career at a foreign-affiliated company.
若いうちにいろいろな分野
I want to gain experience in various fields while I'm young.