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.
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.
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.
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.