Great Design Starts With Real People

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

50+

Projects Shipped

37%

Website Experience

63%

Mobile Experience

Who I work with

Builders who move fast.

Whether you’re pre-seed or scaling Series B, I adapt to where you are.

🚀

Startups & Founders

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.

📈

Scale-ups & Growth Teams

Product-market fit is proven, but your funnel is leaking. I audit, redesign, and optimize the user flows that drive activation, retention, and revenue.

🏛️

Digital Transformation

Large orgs with complex service ecosystems. I map, redesign, and align digital and physical touchpoints into a coherent, conversion-optimized experience.

services

Three ways to work together.

Scoped for speed, designed for outcomes. No retainer padding — just the work that moves the needle.

MVP Design Sprint

Idea → Validated prototype in 3 weeks

Scoped for speed, designed for outcomes. No retainer padding — just the work that moves the needle.

Competitive landscape & assumption mapping
User flow architecture & IA
High-fidelity Figma prototype
Usability testing with 5 real users
Investor deck design support

Start your MVP

Growth Design Retainer

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.

Monthly funnel audit & prioritization
A/B test design & analysis
High-fidelity prototypes & handoff
User interviews & analytics review
Weekly sync + Slack access
KPI dashboard & reporting

Explore Retainer

Strategic Product Design

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.

Vision & strategy workshop
Service blueprint & customer journeys
Research, testing & iteration cycles
Intuitive User Experience (UX/UI)
Design system (Figma) + tokens

Discuss your project

MVP in 3 weeks.

Most early-stage startups over-build before validating. I help you find the minimum lovable experience — the smallest surface that proves your core value and convinces users to come back.

Validate before you build Test core assumptions with real users before a single line of code.
Investor-ready from day one A polished, interactive prototype that tells your story — not just screens.
Built for conversion Onboarding flows, activation hooks, and retention triggers designed in from the start.

start your mvp sprint

Week 1

Discovery & Strategy

User research, assumption mapping, competitive analysis, defining the MVP scope

Week 2

Design & Prototype

User flows, wireframes, high-fidelity Figma prototype with micro-interactions

Week 3

Test & Refine

5 real user sessions, synthesis, iterations, final handoff + dev-ready specs

Medium Blog

Peter Spiegel

Dec 25, 2025

AI and the Human Capital

Peter Spiegel

Dec 20, 2025

UX Design & Affective Computing: When Machines Understand Emotions

Brands & Clients

Volkswagen Group

Deutsche Bahn

ING Germany

Gieseke & Devrient

Deutsches Rotes Kreuz

Immoscout24

BMW

Native Instruments

Senatskanzlei Hamburg

DWS Investments

Deutsche Telekom

Let`s work together.