Harry Higgins https://higgi.dev Deep dives on the engineering behind a ferry booking platform: architecture, experiments, investigations and delivery. en-gb Someone else held our customer's passport https://higgi.dev/passport-holds https://higgi.dev/passport-holds Mon, 26 Oct 2026 00:00:00 GMT How I traced a ferry booking rejection to another site holding the customer's passport before payment. Four days to a deposit https://higgi.dev/deposits https://higgi.dev/deposits Wed, 21 Oct 2026 00:00:00 GMT How we cut a half-built deposit feature down to what release day needed, shipped it in four days, and what the numbers say afterwards. More sailings on screen, more customers to the cart https://higgi.dev/search-results https://higgi.dev/search-results Fri, 16 Oct 2026 00:00:00 GMT A search-results redesign, a 12.7% relative lift, and the tracking checks behind the result. When a ferry operator goes down, the booking keeps going https://higgi.dev/operator-outages https://higgi.dev/operator-outages Mon, 12 Oct 2026 00:00:00 GMT How a ferry booking site's search and booking flow copes when a ferry operator's booking system fails: fast timeouts, a circuit breaker, cached answers and carrying customers through the cart. From a Sanity edit to a live page https://higgi.dev/sanity-deep-dive https://higgi.dev/sanity-deep-dive Tue, 06 Oct 2026 00:00:00 GMT A walk through how a change in a Sanity CMS edit reaches a live ferry booking page: the events, the streams, the tables and where the time goes.