Sergio Gualda — writingEssays on product design, discovery and the decisions that cost me something.https://sgualda.com/enClaude changed how I work, and I’m still not sure that’s a good thinghttps://sgualda.com/writing/claude-ai-product-design-review/https://sgualda.com/writing/claude-ai-product-design-review/Months of using Claude for product design and strategy. What it genuinely accelerates, the thinking habit it replaced, and the trade-off nobody mentions.Wed, 18 Mar 2026 00:00:00 GMTGood product design is not about Figmahttps://sgualda.com/writing/good-product-design/https://sgualda.com/writing/good-product-design/Product design is not the Figma file, it is the decisions inside it. What makes design good, from someone who spent two years optimising the wrong thing.Tue, 29 Jul 2025 00:00:00 GMTMVP vs prototype: the distinction that cost me four monthshttps://sgualda.com/writing/mvp-vs-prototype/https://sgualda.com/writing/mvp-vs-prototype/An MVP is not a small product, it is an experiment. I learned the difference by spending four months building the wrong one. What each is for, and how to pick.Mon, 17 Feb 2025 00:00:00 GMTIs a UX certification worth it? I never got onehttps://sgualda.com/writing/ux-certification-worth-it/https://sgualda.com/writing/ux-certification-worth-it/I looked at UX certifications, priced them, and did not do one. What got me hired instead, and the two situations where a certificate genuinely does help.Tue, 11 Feb 2025 00:00:00 GMTWhen to design for scale, and when it is just expensive guessinghttps://sgualda.com/writing/designing-for-scalability/https://sgualda.com/writing/designing-for-scalability/Designing for scale too early costs as much as designing for it too late. The signal I use to tell the two apart, learned from getting both wrong.Sun, 01 Dec 2024 00:00:00 GMTHEART framework vs NPS: what I learned after two years of using bothhttps://sgualda.com/writing/heart-framework-vs-nps-user-experience/https://sgualda.com/writing/heart-framework-vs-nps-user-experience/I replaced NPS with Google’s HEART framework two years ago. What it caught that NPS missed, what it cost to set up, and the two dimensions I quietly dropped.Fri, 05 Jul 2024 00:00:00 GMTHow to let go of an idea you are attached tohttps://sgualda.com/writing/learning-to-let-go-an-idea/https://sgualda.com/writing/learning-to-let-go-an-idea/The hardest part of product work is binning something you believe in. Why attachment forms, the three signs I have learned to spot, and what actually helps.Sun, 28 Jan 2024 00:00:00 GMT