I design digital products that convert. Berlin-based, 18 years experience.
I work with companies to find where their product loses users — and fix it. Through research, service design, and sharp prioritization.
18+
Years of Experience
60+
Projects Delivered
37%
Website Experience
63%
Mobile Experience
Whether you’re pre-seed or scaling Series B, I adapt to where you are.
You have an idea and need to validate it fast. I help you design an MVP that tests real assumptions, attracts early users, and makes investors confident.
Product-market fit is proven, but your funnel is leaking. I audit, redesign, and optimize the user flows that drive activation, retention, and revenue.
Large orgs with complex service ecosystems. I map, redesign, and align digital and physical touchpoints into a coherent, conversion-optimized experience.
Scoped for speed, designed for outcomes. No retainer padding — just the work that moves the needle.
01
Idea → Validated prototype in 3 weeks
Scoped for speed, designed for outcomes. No retainer padding — just the work that moves the needle.
02
Ongoing CRO & product optimization
Your embedded design partner. Month by month, I identify and fix the biggest conversion and retention leaks — using data, user research, and rapid iteration.
03
End-to-end from vision to launch
For complex products that need deep strategic thinking. I design the full experience — from business model alignment to production-ready design system — with measurable outcomes at every stage.
Medium Blog
Peter Spiegel
Dec 25, 2025
Peter Spiegel
Dec 20, 2025
Volkswagen Group
Deutsche Bahn
ING Germany
Gieseke & Devrient
Deutsches Rotes Kreuz
Immoscout24
BMW
Native Instruments
Senatskanzlei Hamburg
DWS Investments
Deutsche Telekom
