Sergej Haas - UX/UI Freelance Designer

Q: Where is Sergej based?

Sergej is based in Neuss, Germany and can operate in on-site , hybrid , and remote work models.

Q: What languages does Sergej speak?

Sergej speaks the following languages: German (Native), English (Advanced) .

Q: How many years of experience does Sergej have?

Sergej has at least 25 years of experience. During this time, Sergej has worked in at least 6 different roles and for 16 different companies . The average length of individual experience is 2 years and 6 months . Note that Sergej may not have shared all experience and actually has more experience.

Q: What is Sergej's latest experience?

Sergej's most recent position is UX/UI Freelance Designer at Yanfeng Automotive Interior Systems .

Q: What companies has Sergej worked for in recent years?

In recent years, Sergej has worked for Yanfeng Automotive Interior Systems , Jungheinrich , E.ON Digital Technology , Dehner.de , and Deutsche Post DHL Group .

Q: Which industries is Sergej most experienced in?

Sergej is most experienced in industries like Education , Professional Services , and Healthcare . Sergej also has some experience in Telecommunication , Transportation , and Energy .

Q: Which business areas is Sergej most experienced in?

Sergej is most experienced in business areas like Product Development , Information Technology , and Research and Development . Sergej also has some experience in Marketing and Quality Assurance .

Q: Which industries has Sergej worked in recently?

Sergej has recently worked in industries like Healthcare , Transportation , and Telecommunication .

Q: Which business areas has Sergej worked in recently?

Sergej has recently worked in business areas like Product Development , Information Technology , and Research and Development .

Recommended expert

Neuss, Germany

Experience

Jan 2025 - Present

1 year 3 months

Neuss, Germany

UX/UI Freelance Designer

Yanfeng Automotive Interior Systems

Automotive UX/UI design for a show car
Idea generation and research

Nov 2024 - Present

1 year 5 months

Hamburg, Germany

UX/UI Freelance Designer

Jungheinrich

UX/UI design of a B2B section for corporate clients
Building a design system with variables and tokens in Figma

Feb 2023 - Dec 2024

1 year 11 months

Essen, Germany

UX/UI Freelance Designer

E.ON Digital Technology

UX/UI design of intranet modules for viewing and billing orders, scheduling, and managing materials and partner companies
Expanding and maintaining the design library in Figma
User research: planning, moderating, and analyzing customer interviews

Jun 2022 - Dec 2022

7 months

Lead UX/UI Freelance Designer

Dehner.de

Complete online shop redesign in Figma
Responsive mobile-first UX/UI design + prototyping
Building the design library

Dec 2021 - Feb 2023

1 year 3 months

Bonn, Germany

UX/UI Freelance Designer

Deutsche Post DHL Group

UX optimization of the corporate customer portal
UX/UI optimization of the process to become a corporate customer
Optimization of password setup with two-factor authentication
Customer journeys, user flows, wireframes, UI design
User research: planning, moderating, and analyzing customer interviews
Expanding and maintaining the design library
Documentation of user journeys and implementation descriptions for developers

Aug 2021 - Dec 2021

5 months

Stuttgart, Germany

UX/UI Freelance Designer

Robert Bosch GmbH

UX/UI design for an automotive app
UX/UI design, customer journeys, user flows, wireframes
Extending and maintaining the design library

May 2021 - Present

4 years 11 months

Cologne, Germany

UX/UI Freelance Designer

BetterDoc

UX/UI design concept for specialist search for patients
Specialist matching suggestions using a rating scale
Patient health profile
Specialist favorites list

Oct 2020 - Dec 2022

2 years 3 months

Bonn, Germany

Lead UX/UI Freelance Designer

Deutsche Telekom

UX/UI optimization and expansion of the smart home app
User journey for managing household members
UX/UI optimization of the online customer center: increased transparency of used products and creation of personalized upselling recommendations
UX/UI design and prototyping of product and campaign landing pages with a tariff calculator
UX/UI design of product booking configurator and checkout
User research: planning, moderating, and analyzing customer interviews
Working with personas and customer journey mapping including hurdles and opportunities

Dec 2019 - Sep 2020

10 months

Düsseldorf, Germany

UX/UI Freelance Designer

Trivago.com

UX/UI design for a new sub-section for regional travel offers
UX/UI optimization for the trivago app, leading to a 6% increase in overall app revenue
UX/UI design for adding a bonus program
Preparing, conducting, and analyzing user interviews and quantitative tests
Expanding and maintaining the atomic design library

Jul 2019 - Nov 2019

5 months

Cologne, Germany

Lead UX Freelance Designer

AXA S.A.

UX and conversion optimization for product and campaign landing pages and the rate calculator
UX copywriter briefing and review
Visual QA for front-end development

Dec 2018 - Jul 2019

8 months

Düsseldorf, Germany

Lead UX/UI Freelance Designer

Volksbank Raiffeisenbank für Cheil

Full design of the online banking web app for the Volksbank Raiffeisenbank
Information architecture, UX/UI design, responsive adaptation, prototyping, atomic design library, micro-interactions
Icon design and illustrations
Work under strict security standards

Aug 2018 - Nov 2018

4 months

Remscheid, Germany

Lead UX/UI Freelance Designer

Vaillant – Heating Manufacturer

UX/UI relaunch of the website and landing pages
Interactive prototypes
Conversion rate optimization for the list and detail pages of the online product catalog: UX/UI
Micro-interactions, animated prototypes, atomic library, design specifications, visual QA

Jul 2018 - Sep 2018

3 months

Dortmund, Germany

UX/UI Freelance Designer

E.ON Innogy

Work on a web app for managing electric charging stations
UX & UI design for user flows like parameter profiles and firmware updates
Flow charts, wireframes, prototypes, icon design

Mar 2017 - Jun 2018

1 year 4 months

Düsseldorf, Germany

Lead UX/UI Freelance Designer

Vodafone Group

Lead UX/UI Designer for consumer Internet of Things iOS, Android & Web Apps
Lead designer for the data plan booking app
Lead designer for the SOS band app for older people
Responsible for UX, UI design, prototyping, icon design, micro-interactions, visual QA, user interviews, dev specs
Optimized front-end development time by implementing a design library
V by Vodafone app won 2 Mobile News Awards in the "Innovative Product" and "Best IoT Application" categories and an IoT AWARD in the "Best B2C Project" category

Nov 2011 - Feb 2017

5 years 4 months

Wuppertal, Germany

Digital Art Director, Lead UX/UI Designer

Boros.de Agency

Websites and e-shops for various clients in art, culture, and business
Responsible for UX concept and UI design of responsive websites and e-commerce solutions
Won several agency pitches
Art/UX direction for UI/UX and motion designers
Creation of BITV-compliant, accessible style guides and user journeys
Other tasks: corporate identity design, video animations, design style guides

Jan 2008 - Dec 2011

4 years

Düsseldorf, Germany

UX/UI Freelance Designer & Front-End Developer

Max Planck Institute

Jan 2001 - Dec 2008

8 years

Düsseldorf, Germany

UI Designer (Part-Time)

Max Planck Institute

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Education, Professional Services, Healthcare, Telecommunication, Transportation, and Energy.

Education

Professional Services

Healthcare

Telecommunication

Transportation

Energy

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Product Development, Information Technology, Research and Development, Marketing, and Quality Assurance.

Product Development

Information Technology

Research and Development

Marketing

Quality Assurance

Summary

I am a UX/UI designer with over 16 years of experience and specialize in creating efficient user experiences through engaging interfaces. In my work, user needs are always at the center. In my past projects, I helped companies increase customer loyalty and boost their revenue.

Skills

Ui Design
Ux Design
Design Systems
Prototyping
Motion Design
Figma
Photoshop
Midjourney
Illustrator
After Effects
Blender
Cinema 4d
Protopie
Axure Rp
Illustration
Animation
App Design
Android & Ios
Android Auto
Apple Carplay
Icon Design
Style Guides
User Research

Languages

German

Native

English

Advanced

Education

Oct 2003 - Jun 2008

Uni Wuppertal

Diploma II in Communication Design · Communication Design · Wuppertal, Germany · 1.2

Jan 2002 - Jun 2002

Marie-Curie-Gymnasium

High School Diploma · Düsseldorf, Germany · 2.4

Statistics

Experience

Total positions 17

Experience in Education 11 y

Avg length 2 y

Longest experience 7 y 11 m

Global Experience

Countries worked in 1 (Germany)

Primary country Germany

Expertise

Recent roles UX/UI Freelance Designer, Lead UX/UI Freelance Designer, Lead UX Freelance Designer

Main industries Education, Professional Services, Healthcare

Main business areas Product Development, Information Technology, Research and Development

Qualifications

Profile

Created

December 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Sergej based?

Sergej is based in Neuss, Germany and can operate in on-site, hybrid, and remote work models.

What languages does Sergej speak?

Sergej speaks the following languages: German (Native), English (Advanced).

How many years of experience does Sergej have?

Sergej has at least 25 years of experience. During this time, Sergej has worked in at least 6 different roles and for 16 different companies. The average length of individual experience is 2 years and 6 months. Note that Sergej may not have shared all experience and actually has more experience.

What roles would Sergej be best suited for?

Based on recent experience, Sergej would be well-suited for roles such as: UX/UI Freelance Designer, Lead UX/UI Freelance Designer, Lead UX Freelance Designer.

What is Sergej's latest experience?

Sergej's most recent position is UX/UI Freelance Designer at Yanfeng Automotive Interior Systems.

What companies has Sergej worked for in recent years?

In recent years, Sergej has worked for Yanfeng Automotive Interior Systems, Jungheinrich, E.ON Digital Technology, Dehner.de, and Deutsche Post DHL Group.

Which industries is Sergej most experienced in?

Sergej is most experienced in industries like Education, Professional Services, and Healthcare. Sergej also has some experience in Telecommunication, Transportation, and Energy.

Which business areas is Sergej most experienced in?

Sergej is most experienced in business areas like Product Development, Information Technology, and Research and Development. Sergej also has some experience in Marketing and Quality Assurance.

Which industries has Sergej worked in recently?

Sergej has recently worked in industries like Healthcare, Transportation, and Telecommunication.

Which business areas has Sergej worked in recently?

Sergej has recently worked in business areas like Product Development, Information Technology, and Research and Development.

What is Sergej's education?

Sergej attended Uni Wuppertal for Communication Design.

What is the availability of Sergej?

Sergej is immediately available full-time for suitable projects.

What is the rate of Sergej?

Sergej's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.