Dynamically determining and serving content to end users across different platforms

A server system for dynamically serving digital content in real-time for presentation across different channels associated with a user device of a user, the server system comprising one or more processors, and cache memory storing instructions that, when executed, cause the one or more processors to perform operations comprising:

• retrieving, at a first time and from a data repository, a portion of predefined digital content having a predetermined property associated with the digital content;
• determining, at the first time and based on user personalization information, a subset of the portion of predefined digital content, the subset being determined independently of presentation requirements of any channel;
• storing in the cache memory, the subset of the portion of predefined digital content, wherein storing in the cache memory reduces computational resources required for serving personalized digital content at a second time, wherein the second time is real-time;
• and
• serving, at the second time, digital content to a user device of a user that is selected from amongst the subset of the portion of predefined digital content stored in the cache memory, wherein serving the digital content comprises:
• receiving a request for digital content to be presented at the user device, the request comprising an indication of a channel associated with the user device, wherein the channel is an interface at the user device for visually presenting the digital content, wherein presenting the digital content is based on presentation requirements of the channel, and
• dynamically generating, based on the selected digital content, visual content elements that comply with presentation requirements of the indicated channel.