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Design memory for a personal AI assistant that remembers users across sessions.

Cross-session memory is what makes an assistant feel personal, and it is mostly a retrieval and state-management problem, not a bigger context window. The signal is the tiered architecture plus what to store, forget, and protect.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Cross-session memory is what makes an assistant feel personal, and it is mostly a retrieval and state-management problem, not a bigger context window. The signal is the tiered architecture plus what to store, forget, and protect.

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Applied AI Engineering·The interviewPremium14mDriving the design conversationA design round is a conversation you are expected to lead, not a question you answer. This lesson is the shape that works, the four moments that decide the outcome, and the two classic ways strong candidates lose one.Applied AI Engineering·The interviewPremium12mTurning this course into a study planA concrete four-week plan mapping the seven modules onto the question bank, plus what to do differently if your interview is next week rather than next month.
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Next in this trackDesign a multi-agent customer support system with escalation to humans.Next in this trackDesign an LLM inference platform (vLLM-as-a-service) serving many models and teams.Next in this trackDesign an AI code review system that comments on pull requests.
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