Oliver Roick

I build software that puts people on the map. I work at Cadasta Foundation. Most of my work is available on GitHub.


Looping AWS Step Functions

I recently started tinkering with Step Functions for a pet project, Nea. For performance reasons, I wanted to download and process individual feeds in parallel using instances of the same Lambda function. This isn’t currently possible using Step Functions building blocks, so I implemented a workaround by designing a loop into my Step Functions state machine.

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Selected Work


Cadasta platform is a set of tools collect, manage and store on land and property rights on the web.


GeoKey is a platform for participatory mapping. I developed GeoKey during my time at UCL ExCiteS, who have taken over development since my departure in October 2015.


Leaflet.Deflate is a plugin for the web mapping library Leaflet that converts features in low zoom levels to markers if they become too small to be visible and vice versa.

Django Skivvy

Django Skivvy is a helper library that helps you write faster integration tests for Django views with less code.

Other projects & experiments