[offers][chore] Make all filters optional (#493)
[offers][chore] Make all filters optional (#493)

Co-authored-by: Bryann Yeap Kok Keong <4a40532d09bd8e036f991f6c4507f45f7fde269a@gmail.com>
yangshun/tech-interview-handbook,yangshun/tech-interview-handbook,yangshun/tech-interview-handbook,yangshun/tech-interview-handbook,yangshun/tech-interview-handbook