The ORCID Registry uses a PostgreSQL database, and we employ a SOLR search engine.
Our software is developed using JAVA, and is released under an MIT Open Source Software license and distributed on GitHub at https://github.com/ORCID/ORCID-Source.
ORCID APIs use RESTful Web services, and responses are in XML and JSON.
The ORCID Registry is hosted on Rackspace.
Our database table structure, APIs, sample code, documentation, and a sandbox are available for developers to test integration.