Do search on the forum or more reading in this decking sub-forum. Plenty of threads which will help you including a recent one on the CAMO system (which was liked buy the member who used it, but it seemed to me from the videos to be very slow and also not as well suited to the decking timbers used in Australia. But I've not used it. I have used biscuit type systems and they work OK, but are slow too. I am not so fussed about hiding fixings - quite like SS screw heads.
Advice from me on this forum is general and for guidance based on information given by the member posing the question. Not to be used in place of professional advice from people appropriately qualified in the relevant field. All structural work must be approved and constructed to the BCA or other relevant standards by suitably licensed persons. The person doing the work and reading my advice accepts responsibility for ensuring the work done accords with the applicable law.