"We have hired David as a consultant to help us with the migration and global improvement of one of our critical web application used by dozens of customs authorities and many other stakeholders around the world. David has a great expertise in Grails/Groovy and he did an excellent job in performing what was requested. David is also very professional as he has a keen interest in quality, focusing on automated tests, and he didn't hesitate to go the extra mile to ensure the long term viability of our application."