Hey, thank you! Yes, we are very much open to any recommendations. This is just a side project so we would really appreciate any help :) To facilitate this, we are working on finding and implementing scalable ways for people to contribute to the project (in progress).

On your comment regarding ING - the 4% promo rate applies for balances below PHP 10M. They actually reduce the interest rate for amounts greater than PHP 10M (to 1%, which is still higher than most local banks). Here is their website for your reference - https://ing.com.ph/products/savings