YOU SAID:

there is homework that needs to be done

INTO JAPANESE

やりがいのある宿題がある

BACK INTO ENGLISH

I have a challenging assignment

INTO JAPANESE

私は挑戦的な課題がある

BACK INTO ENGLISH

I have a challenging task

INTO JAPANESE

私は挑戦的な仕事がある

BACK INTO ENGLISH

I have a challenging job

INTO JAPANESE

私は挑戦的な仕事をしています

BACK INTO ENGLISH

I am doing a challenging job

INTO JAPANESE

私は挑戦的な仕事をしています

BACK INTO ENGLISH

I am doing a challenging job