Our company is in need of creating a custom variant of LineageOS (or AOSP if possible) that will provide parental control features at an operating-system level (preventing these features from being "uninstalled" from the phone). We will call this parental control features service the Parental Control Service or (PCS) in this document. The Parental Control Service (PCS) settings (whitelists, enable/disable settings, etc) shall be able to be set by our user-facing application called the Parent Portal Interface (or PPI in this document). PCS Features include: Phone Call Feautures: * Limiting receiving phone calls from a whitelist Text Messaging Features: * Ability to enable/disable photo attachments/reception from mmsgs * Limiting receiving text messages from a whitelist App/Activity Features * Prohibiting app (based on package name) from launching/running based on usage ** E.g. Application xyz is allowed 1 hour per day of usage * Prohibiting app (based on package name) from launching/running based on a blacklist time range ** E.g. Application xyz is not allowed to be used from 10:30pm - 6:30am * Phone locking ** Locking phone and prohibiting phone from unlocking based on usage ** E.g. Phone is allowed 4 hours per day of usage (unlocked screen time) * Locking phone and prohibiting phone from unlocking based on a blacklist time range ** E.g. Phone is not allowed to be used from 10:30pm - 6:30am * Lock screen is allowed to make phone calls (e.g. for emergencies) Browser prevention * Enable/Disable any browser from being able to be run (e.g. if a browser were installed, it wouldn't work if the "browser" feature was disabled. Application Installation * Any other third-party applications shall only be able to be installed via the PPI app and only the PPI app. If the PPI app installs another third-party app that is normally capable of installing aps (e.g., Amazon App), this feature will prevent the third-party app (e.g. Amazon) Command/Control of these features should be made available to the PPI app. Not sure the implementation details and will rely on the freelancer's expertise; but will describe the end-goal: This PPSperating-level service that you will be developing needs to be able to be managed by our app and only our app. We will have an app that will need to be able to communicate in some way to this backend. Not sure if this requires an AIDL or some other SDK interface, but as long as there is an interface provided where this can be accomplished, that will be great. Delivery of the solution shall include all the code and instructions on how to build/deploy for the android emulator target. The solution shall be portable enough to be able to be part of other device builds (e.g. for example, the build target is for a Pixel device).