ok, do you have any experience or just fresh off uni?
if no experience, then forget about it.
If experience, then see if you can an internal move with your current company (if they have office there), by far the easiest move.
Applying online is useless, HR here are useless and will only contact people who match 100% what is on the JD. They can't understand how you can transfer skills etc...
They will also look at, are you in HK, if not then very slim chance of getting anywhere, they also don't want to be bothered with Visa stuff.
As said above, I disagree with what is said about Linkedin. Get your name out there, connect with people. Post about things related to your industry, analysis you have done, insights you have etc.... People are bad at a few things here, like creative thinking, problem solving, visualizing ideas etc... if you can show you are good at that then you might have a chance.
At a certain level of experience it's all done via your contact. And HK relies a lot on contact, most people don't read their emails, or read and never follow up. If they meet you face to face they will definitely remember you.
On Linkedin, try to find the hiring manager and drop him a line. Show that you know why you apply there and what their challenges/opportunities are.
The job market is hot at the moment, a lot of companies struggle to find technical talents and unemployment rate is very low.
Applying on job board or doing quick apply on Linkedin is useless. I've been on both sides, posted jobs and got a million application (most being completely random without having read the JD).
Finance is big in HK but there is a lot of competition with locals who can take low salaries while living with their parents. It's not getting easier.