By using your name and email in the 'author' field of commits, unless declared otherwise in the commit message or in a file included in the committed tree, you affirm that you are the holder of the copyright to the code (i.e. that it has not been copied from a different copyright holder).
You could in principle choose any OpenSource license that is compatible with the other parts of the system as the license for your code. But there will be files with mixed authorship and for these it will be practically necessary to use the same license for all contributions, and it will also be beneficial for the product if the same license is used for (almost) everything. Thus we should agree on a preferred license.
Do you have insight about what license we should choose?
Current suggestion is the MIT License (Wikipedia). The choice will be set at the planning/decision meeting.