Karl Higley

Recommender systems engineer brewing practical magic with algorithms and data. I build end-to-end recommendations from pipelines to production. Equal parts researcher, tinkerer, and digital hedge witch.

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Silhouetted trees under a blood moon and shooting stars.

Marginalia

Gathering Signals as the Season Turns

The conference circuit continues, and we share sage community wisdom on modeling and evaluation

Sep 7, 2026 6 min read

A corked bottle with a rolled scroll inside and a bow tied around the neck sits at an angle, partially buried in sand, surrounded by a ring of partially-lit small candles.

Mystic Manuscripts

Cold-Start Recs at Pinterest

We love that this paper takes a holistic view of recommendation quality beyond predictive accuracy

Aug 7, 2026 3 min read

Disembodied mystical blue hands: conjure fire, weave a pentagram, create sparkles, open an eye in the palm, and hold a magic key.

Handy Hexes

Using Explicit Negative Feedback

We're well-versed in distilling the essence of positive expressions of interest—but what about disinterest?

Jul 17, 2026 4 min read

Stylized sun with abstract, mystical pink and teal shapes.

Marginalia

June Beginnings

With the solstice behind us, we're heading into a time of great occult significance: conference season!

Jun 28, 2026 4 min read