AI/ML Engineer signal: hash map + dedupe in a feature store freshness context. This is a ProdMatch-owned ai ml engineer drill, framed as a April 2026 Wingify ML Platform simulation, not a copied platform question.
Company context
Wingify · ML Platform
Freshness
April 2026
Product surface
feature store freshness
ProdMatch interview simulation based on product-team patterns; not a claim of a real company question.
For feature store freshness, collapse duplicate features by external ID. Keep the newest event per ID and return IDs in first-seen order.
Input
Output
Constraints
Concepts
[(a,1),(b,1),(a,3)] -> [(a,3),(b,1)]
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