Architect
noun
You know that 建築 is architecture. So, someone of house architecture is someone who does architecture. They are an architect.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. It will also help if you know how to read 建築 already.
お父さん、あんたが建築家になったから、鼻が高いのよ。
Dad is very proud because you became an architect.
こちらはフランス人建築家のジュール・レスカスが建築した建物です。
This building was built by French architect Jules Lescas.
私の家は有名な建築家によってデザインされたんですよ。
My house was designed by a famous architect.