Hi!
If you've opened this page, you're normally a software developer wishing to contribute to the development of Sigmah. This guide is then you're main tool to build step-by-step your capacity to work on the project.
First of all: Welcome!
The best way to start is to send an email to our "sigmah-dev" developer mailing list. All the developer community is on this mailing list, and you're invited to post any question you may have on this list.
Then, you can read step this Contributor Guide from general introduction about the humanitarian sector up to the installation of your software development environment:
When you will have finished to install your environment, you can take a look at the project roadmap page and pick some simple bugs to start to build your capacity to work on the project by solving simple issues. The simplest issues are marked with the tag “LowHangingFruits”, and here is the full list of them: LowHangingFruits. If you don't know which issue you should pick up, please feel free to ask on the sigmah-dev mailing list.
And very important: please feel free to ask questions to the mailing list anytime you have one! :) There are no stupid questions, only people stupid enough not to ask them. :)
Welcome once again and looking forward to your first message on sigmah-dev!