To always keep looking to improve. It may be the people, the systems, the processes. We are open to feedback and look to improve as much as possible.
For me the biggest success would be the new team structure. Having focused teams own a part of the functionality of the application lead to them releasing major features such as the new Roles and Permissions changes and the improved interview scheduling features.
Having such teams not only enables us to build bigger features, it also helps with the lifetime of the feature. If an issue comes in or there is a minor request to improve something, the team can get right on it because they wouldn't have lost context on it. This streamlines the overall application because the features themselves are now more cohesive.