A method for migrating a web application from a source environment to a cloud service, the method comprising: accessing, by a cloud service system, a temporary container containing a manifest and a plurality of web parts for the web application, wherein each web part of the plurality of web parts is a software component that generates web-based content for the web application during operation of the web application, wherein the manifest includes a list of contents of the temporary container and defines an appearance and functionality of the web application operating in the source environment; reconstructing, by the cloud service system, the web application on the cloud service by automatically generating a user interface environment for the web application on the cloud service based on the manifest, and importing each web part of the plurality of web parts to the cloud service by configuring each web part and the user interface environment to interact as defined by the manifest, wherein the user interface environment on the cloud service replicates the appearance and functionality of the web application operating in the source environment; receiving, by the cloud service system, a single API call requesting migration of the web application to the cloud service, wherein reconstructing the web application on the cloud service includes reconstructing the web application on the cloud service in response to receiving the single API call; generating, by the cloud service system, a response to the single API call after reconstructing the web application on the cloud service, wherein the response to the single API call confirms that the migration of the web application to the cloud service is complete; and identifying, by the cloud service system, one or more periods of relatively low usage of the cloud service after receiving the single API call, wherein reconstructing the web application on the cloud service includes reconstructing the web application on the cloud service asynchronously only during the one or more identified periods of relatively low usage of the cloud service, wherein the periods of relatively low usage corresponds to periods when sufficient services resources required for the migration of the web application are available. accessing, by a cloud service system, a temporary container containing a manifest and a plurality of web parts for the web application, wherein each web part of the plurality of web parts is a software component that generates web-based content for the web application during operation of the web application, wherein the manifest includes a list of contents of the temporary container and defines an appearance and functionality of the web application operating in the source environment; reconstructing, by the cloud service system, the web application on the cloud service by automatically generating a user interface environment for the web application on the cloud service based on the manifest, and importing each web part of the plurality of web parts to the cloud service by configuring each web part and the user interface environment to interact as defined by the manifest, wherein the user interface environment on the cloud service replicates the appearance and functionality of the web application operating in the source environment; receiving, by the cloud service system, a single API call requesting migration of the web application to the cloud service, wherein reconstructing the web application on the cloud service includes reconstructing the web application on the cloud service in response to receiving the single API call; generating, by the cloud service system, a response to the single API call after reconstructing the web application on the cloud service, wherein the response to the single API call confirms that the migration of the web application to the cloud service is complete; and identifying, by the cloud service system, one or more periods of relatively low usage of the cloud service after receiving the single API call, wherein reconstructing the web application on the cloud service includes reconstructing the web application on the cloud service asynchronously only during the one or more identified periods of relatively low usage of the cloud service, wherein the periods of relatively low usage corresponds to periods when sufficient services resources required for the migration of the web application are available.