I'm founder and CEO at ODK and we are hiring (https://getodk.org/jobs)!

ODK is an open-source mobile data collection platform. The common use-case is a data collector in the field fills out a form while offline. Whenever a connection is found, the data gets sent to a server where it can be seen and acted on.

ODK is basically the Land Cruiser of mobile data collection apps. It's designed to be very reliable in challenging settings and it's trusted for that reason. ODK is unique because the tool is generic, but it's primarily used by organizations working in humanitarian aid and global health. It's also unique because it's got a very friendly community of developers and users who hang out at https://forum.getodk.org.

You asked about impact? The impact of ODK on global health alone is pretty wild.

* ODK was a key tool in the eradication of wild polio in Africa (https://www.africakicksoutwildpolio.com/the-top-five-tech-so...)

* ODK was used to collect the clinical trial data for the recent malaria vaccine (https://forum.getodk.org/t/odk-s-role-in-the-first-malaria-v...)

* ODK is used to measure the global burden of disease through verbal autopsies (https://www.nytimes.com/2022/04/19/health/death-records-afri...)

And that's just global health...

* Jane Goodall Institute uses it to track the health of apes (https://www.google.com/nonprofits/success-stories/jane-gooda...)

* Red Cross uses it in most crises they respond to (https://americanredcross.github.io/2019/01/08/odk-collect-im...)

* Carter Center uses it for election monitoring (https://getnemo.org/)

* Honduras uses it to track education progress of students (https://proceso.hn/imperdonable-invisibilizar-casi-2-millone...)

* Sierra Leone is using it to monitor the planting of millions of trees (https://blogs.worldbank.org/sustainablecities/freetownthetre...)

So yeah, if you want to work on something that is objectively having positive impact, ODK is a great option!