Case studies & experiments
Selected product work across fintech, mobility, SaaS, design systems, and health, plus interaction experiments built in code.
Shoppable video: from MVP to multi-market launch
Led Klarna's shoppable video from zero.
PropTech platform: brand and product rebuilt together
Led the full redesign of SonarHome, an early-stage Polish PropTech platform.
Making UI creation scalable through a design system
Led Rakbank's design system from scratch: token layer, 200+ components, adopted across 15+ product teams.
Merchant portal: from fragmented tools to unified workflow
Led the Klarna merchant portal redesign for Shoppable Video.
Multi-model courier onboarding
Took over Wolt's multi-model courier onboarding mid-flight as part of the DoorDash platform consolidation.
Fire TV Studio IDE, reframing the brief
Reframed a sidebar polish brief into a workflow-driven IDE redesign.
Apple Pay as a stored payment method
Redesigned EasyPark's Apple Pay implementation from inconsistent hardcoded authorisation to a recurring MIT payment-profile model spanning subscriptions, parking sessions, and camera parking.
Mobile onboarding: from 70% drop-off to 38% trial conversion
Redesigned Guesty mobile onboarding by splitting Lite and Pro users into separate flows instead of a single flow with conditional logic.
ExperimentBuilding petermarc.com: design, code, and AI in one repo
A full rebuild of my portfolio and services site: not a template swap, but a typed content layer, token-driven CSS, scroll-linked sections, and a component library shaped around how I actually pitch founder work, built iteratively in Cursor with the same stack I recommend to clients..
ExperimentHolographic card carousel
Klarna card selector that feels like flipping through Pokémon trading cards, ghost-duplicate infinite scroll, pointer tilt, accelerometer-driven holo layers, and iOS haptic steps..
ExperimentIcon burst
Native Apple-style app icons bursting outward in every direction on tap.
ExperimentEnergy tracking for better daily decisions
Daygrain is my current product experiment: a personal energy and decision-making app built around daily logging, Apple Health signals, and honest self-awareness.
Mobile banking redesign for three user types
Led Rakbank's mobile banking redesign across three user types, retail customers, SME owners, relationship managers, using one shared token system.
Discount flow: from 80% abandonment to 90% conversion
Redesigned EasyPark's discount application flow on 457,000 annual transactions with 80% abandonment.
One token layer, seven platforms
Led the Sector Alarm design system: one token layer serving 7 platforms simultaneously (iOS, Android, tablet, Apple Watch, Wear OS, web, desktop).
Have a product flow that feels harder to explain than it should?
Send me your product, MVP, deck, or prototype. I'll tell you where I'd start.