TLDR Tech / Data
Real-Time Personalisation at Scale: How Zepto Understands What You Want, Right Now
Zepto built a Dual Sequence ReRanker for real-time personalisation that combines a user's long-term history with their current in-session behavior using separate transformer encoders for history and session sequences, target-aware pooling (dynamically rebuilding the user profile per candidate item), a learned fusion gate, and real-time signals (trending counters, calendar context).
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