Methods and systems for transforming bytecodes using virtual artifacts are disclosed. In one aspect, a method is provided that includes receiving a build request to convert source code into a first bytecode. A first virtual artifact may be identified within the source code and it may be determined that a local repository does not store the first virtual artifact. A real artifact that corresponds to the first virtual artifact may be retrieved from a centralized repository. A bytecode transformation may be applied to the real artifact to generate a second bytecode and the second bytecode may be added to the first bytecode.