Senior UX Design Lead · Product Strategy · AI-Driven Design

Pierre
Seifert

More than 15 years shaping digital products at scale — from booking funnel to design system, from team of one to cross-functional enterprise org.

15+
Years in UX
1
Company. Deep expertise.
Products shipped
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About
01

I design digital products that serve millions of users — with strategic clarity, hands-on craft, and a calm executive presence.

Over 15 years at SIXT SE, I grew from Lead Art Director to Senior UX Design Lead — owning the user experience of one of Europe's largest mobility platforms across web, mobile, and enterprise tools. That depth of context is rare: I know how enterprise design organisations scale, how design systems evolve, and how to align UX strategy with business outcomes.

My daily work bridges strategy and execution. I run workshops, shape product vision, mentor teams — and I still do the work: wireframes, flows, high-fidelity UI, prototypes. I believe the best design leaders never lose their craft.

Based in Chemnitz, Saxony, Germany. Fluent in German and English. Open to remote and hybrid senior roles.

"Strategic enough to align stakeholders, hands-on enough to know when the solution lives in the details. Calm under complexity. Clear in every deliverable."

How I work today

AI-Native Design Practice

AI-driven workflows are not an experiment for me — they are part of my daily practice. I use AI tools across the entire design process: from rapid ideation and research synthesis to UX documentation, content strategy, and cross-team collaboration.

This means I deliver faster without cutting corners — and I help teams adopt these workflows too. It's a genuine differentiator in senior design leadership today.

ChatGPT Claude Cursor AI ideation Research synthesis Prompt design AI prototyping Doc generation
The SIXT Chapter
02

More than fifteen years. One company. Four distinct phases of leadership and craft — from building the first design processes to scaling a design organisation across international enterprise products.

2019 — Present
Senior UX Design Lead
SIXT SE  ·  Pullach im Isartal, Germany

Strategic UX leadership across the full digital product ecosystem — web, mobile and enterprise platforms for millions of users globally. Driving UX strategy, quality governance and design system evolution while staying hands-on with high-impact product decisions. AI-augmented workflows integrated as core practice.

UX strategy Design governance Enterprise design systems Team leadership AI workflows
2016 — 2019
Senior Executive Manager UX Design · Team Lead
SIXT SE  ·  Pullach im Isartal, Germany

Built and scaled cross-platform UX/UI teams from the ground up. Introduced the enterprise design system and established research-driven design practices across web and mobile. Managed agencies and freelancers alongside in-house teams.

Team building Design system foundations UX research practice Agency management
2012 — 2016
Senior Manager UX/UI · Team Lead
SIXT SE  ·  Pullach im Isartal, Germany

Established the first dedicated UX/UI team at SIXT. Defined online CI guidelines, introduced qualitative and quantitative testing methodologies, and led design for the global web platform redesign — including international rollout to all worldwide domains.

First UX/UI team Global web redesign CI/brand guidelines Conversion testing
2008 — 2012
Lead Art Director / UX & UI
SIXT SE  ·  Pullach im Isartal, Germany

End-to-end ownership of UX and UI for SIXT web platforms and booking funnels. Defined digital brand guidelines and pioneered conversion-oriented UX approaches. Early adopter of user research and A/B testing methodologies at SIXT.

Booking funnel UX Web UI design Brand / digital CI Early UX research
Selected Work
03
01
Global Web Platform  ·  UX Strategy  ·  Conversion

SIXT Rent a Car — Global Redesign

The challenge

Complete redesign of the global SIXT rent-a-car web presence including the booking funnel — rolled out to all international domains. The task was to modernise the experience, improve conversion, and create a scalable design foundation for ongoing optimisation.

My role
  • UX concept, information architecture, user flows
  • Wireframes and high-fidelity UI design
  • Collaboration with conversion optimisation and product
  • International rollout coordination across country teams
  • Ongoing A/B testing and iterative improvement
Measurable conversion uplift post-launch; design used as the foundation for subsequent product iterations across all SIXT markets.
02
Design System  ·  Enterprise  ·  Scalability

SIXT P100 Design System

The challenge

As SIXT's digital surface area grew — web, mobile, internal tools, counter displays — inconsistency became a business risk. The P100 design system was built to unify UI language, accelerate delivery, and give product teams a shared source of truth.

My role
  • Design system strategy and architecture
  • Component library design and documentation in Figma
  • Zeroheight integration for developer handoff
  • Cross-team alignment with engineering and product
  • Governance model: contribution, versioning, adoption
Reduced design inconsistency across platforms; faster onboarding for new designers and engineers; adopted as the enterprise-wide standard.
03
Mobile  ·  Sharing Economy  ·  Product Design

SIXT Share — Carsharing App

The challenge

SIXT entering the carsharing market required a product experience that could compete with established players — while feeling distinctly SIXT. The UX needed to work for first-time carsharing users as well as frequent drivers, across a complete booking-to-return flow.

My role
  • UX concept and interaction design for iOS and Android
  • User research and competitive analysis
  • Prototyping and usability testing
  • Design system adaptation for mobile
  • Close collaboration with engineering and product management
App launched successfully in multiple European cities; positive user feedback on the onboarding flow specifically.
04
B2B  ·  Enterprise UX  ·  Complex Workflows

SIXT B2B — Vans, Trucks & Fleet

The challenge

B2B fleet managers and business customers have fundamentally different needs than consumer renters. This project redesigned the B2B van and truck rental experience — a complex workflow with multiple user types, pricing structures, and account management requirements.

My role
  • UX research with B2B customers and fleet managers
  • Service design mapping: end-to-end B2B journey
  • UI design for web and internal back-office tools
  • Stakeholder alignment across product, sales and operations
Simplified complex multi-step workflows; reduced task completion time for fleet managers; improved B2B lead generation metrics.
05
E-Commerce  ·  Used Cars  ·  Conversion

SIXT Car Sales — Used Car Platform

The challenge

SIXT Car Sales (formerly Carpark) needed a ground-up redesign to compete in the growing online used-car market. The goal was a modern, responsive platform that makes vehicle search and purchase intuitive — while improving conversion at every step of the funnel.

My role
  • Full UX process lead: research, concept, wireframes, UI
  • Rethought site architecture and search/filter experience
  • Responsive design for all device types
  • Analysis of existing page data and previous test results
  • Quality assurance and final UI sign-off
Complete redesign delivered with measurable improvements in usability and conversion; platform continued with ongoing feature extensions post-launch.
06
Subscription  ·  New Business Model  ·  App & Web

SIXT+ Auto Abo — Car Subscription

The challenge

SIXT+ is SIXT's entry into the car subscription market — a new business model sitting between rental and leasing. The product needed to communicate a complex, all-inclusive offer simply, and guide users through a multi-step configuration and booking flow across web and app.

My role
  • UX concept for the subscription configurator and booking flow
  • Translating a novel pricing model into an intuitive UI
  • Web and app design in close collaboration with product and engineering
  • Design system integration: SIXT P100 components adapted for subscription context
  • Iterative testing and refinement of onboarding and account management
Product launched across multiple European markets; subscription model now a core pillar of the SIXT mobility portfolio alongside rental, sharing and rides.
Core Competencies
05
Strategy & Leadership
  • UX Strategy
  • Team Leadership & Mentoring
  • Stakeholder Management
  • Design Quality & Governance
  • Workshop Facilitation
  • Cross-functional Collaboration
  • Design Operations
Product & UX Design
  • Product Thinking
  • UX Research & Testing
  • Interaction Design
  • Rapid Prototyping
  • Design Systems
  • Conversion Optimisation
  • Information Architecture
Tools & Ecosystem
  • Figma
  • Adobe Creative Suite
  • Miro · Zeroheight
  • Jira · Confluence · Slack
  • ChatGPT · Claude · Cursor
  • Frontend understanding
  • HTML / CSS
Get in touch

Let's talk.

I'm open to senior UX and product design leadership roles — on-site, hybrid or remote. If you're looking for someone who combines strategic thinking with deep hands-on craft and a genuine AI-native workflow, let's have a conversation.