1. A method for computing resource allocation at a data center, the method comprising: under control of a Program Execution Service (PES) platform that includes a number of data centers, each data center including one or more computing systems configurable to provide a user with access to a compute node hosted by at least one of the one or more computing systems, the compute node comprising a virtual desktop that enables the user to access a plurality of services provided by the PES platform: receiving a request at a data center of the PES platform to obtain access to the compute node from a computing device of the user; identifying the user associated with the computing device; accessing user metadata associated with the user based, at least in part, on the user's identity; selecting a set of resource placement rules based, at least in part, on the user metadata, the set of resource placement rules selected to reduce the impact of a computing system failure on a set of users, the set of users including the user; identifying a computing system from the one or more computing systems of the data center based, at least in part, on the set of resource placement rules; and providing the user with access to the compute node on the computing system.