You can use Hook Post Action module which will provide you hooks like:
- hook_entity_postsave
- hook_entity_postinsert
- hook_entity_postupdate
- hook_entity_postdelete
- hook_node_postsave
- hook_node_postinsert
- hook_node_postupdate
- hook_node_postdelete
These hooks are fired after node is saved to the database. So the process you want to do after node save can be done using these hooks which comes with Hook Post action module.