Head of Design at BVNK, a Mastercard company, based in Sofia. Most of my time goes into the systems a design team runs on: a design system that people and AI agents can both build with, and an operating loop where Claude keeps the books so the team's work stays visible. I still make things, mostly prototypes and small tools built with Claude, and this is where I write about what works.https://spas.design/https://spas.design/posts/billing-vision/https://spas.design/posts/billing-vision/A case study in mapping a company's billing from end to end, finding the root cause of misbilling, and setting one vision for the teams fixing it.Wed, 11 Nov 2026 00:00:00 GMThttps://spas.design/posts/portal-vision/https://spas.design/posts/portal-vision/How design turned a new company strategy into a clickable picture of the target product, and how product teams now use it to decide what to build and where each initiative sits.Mon, 09 Nov 2026 00:00:00 GMThttps://spas.design/posts/bvnk-design-system/https://spas.design/posts/bvnk-design-system/How we took design system adoption at BVNK from 12% to about 75% across seven apps, and wrote one set of rules that designers and AI agents both build with.Sun, 08 Nov 2026 00:00:00 GMThttps://spas.design/posts/bvnk-mastercard-brand/https://spas.design/posts/bvnk-mastercard-brand/In August 2026, BVNK became part of Mastercard. Seven weeks later, the website, the sales library, social and email had all moved to one new identity. This is how we split the work, kept the best of both brands and shipped it in public.Sat, 07 Nov 2026 00:00:00 GMThttps://spas.design/posts/from-buzzwords-to-reality/https://spas.design/posts/from-buzzwords-to-reality/Everyone nods when customer focus comes up in a meeting. Making it stick took a newsletter, bi-weekly CX Talks and a diary study that ended up winning an award.Mon, 24 Jul 2023 00:00:00 GMThttps://spas.design/posts/one-language-to-rule-them-all/https://spas.design/posts/one-language-to-rule-them-all/How we went from freestyle CSS and a pile of Angular libraries to one themeable system for Skrill and Neteller, and why it saved us weeks when the two front ends merged.Mon, 24 Jul 2023 00:00:00 GMThttps://spas.design/posts/qualitative-and-quantitative-insights/https://spas.design/posts/qualitative-and-quantitative-insights/50+ interviews in three countries told us Skrill users didn’t stay loyal to one betting site. The numbers said the same, and that led to a small merchant widget, a design sprint and a roadmap.Sun, 23 Jul 2023 00:00:00 GMT