Jens Oppermann

Senior UX / UI / AI Frontend Developer

The classic digital world is fading at record speed - and I’m not watching from the sidelines, I’m transforming in the thick of it. After more than 20 years as a software developer, I’m now converting my expertise into AI‑native solutions where code and artificial intelligence fuse into an entirely new development discipline. The new AI production line will revolutionize everything - start learning now - start transforming now!

Skills & Expertise

The sturdy trunk supporting growth - deep technical expertise and modern methodologies

Frontend & Scripting

HTML HAML CSS SASS LESS JavaScript ECMA6+ TypeScript jQuery VueJS ReactJS AlpineJS QooxDoo KnockoutJS

Architecture & Methods

ITCSS BEM BEVM ATOMIC OOCSS Responsive Design Accessibility (a11y) WCAG UI/UX Design Systems Enterprise Templating Performance Optimization

CMS & Backend-Templating

Magnolia Hybris Storefront Adobe Experience Manager (AEM) Intershop JSP JSTL FreeMarker HandleBars ISML HTL Smarty/PHP RubyOnRails

Tools & Processes

GIT SVN JIRA Confluence Gulp Grunt WebPack BrowserSync BackstopJS Jest Spectre Selenium SCRUM KANBAN Photoshop RoboHelp

Additional Technologies

C# WPF XAML Telerik NodeJS XML XSLT

Project Timeline

A chronological view of major projects and achievements

Trusted by 10+ leading companies including HZD Hessische Zentrale für Datenverarbeitung, DAAD, Carl Zeiss AG, Bechtle AG, BASF Business Services GmbH and many more.

08/2022 - 07/2025

HZD Hessische Zentrale für Datenverarbeitung

Modernization of Administrative Software & Design System

As part of the Online Access Act (OZG) & WCAG Conformance, the role included a UI/UX design for the FisBox administrative software using C# Blazor and Telerik UI for Blazor & WPF, and building a comprehensive design system with a focus on WCAG compliance. We also built a web version of the FisBox software with C# Blazor and Telerik UI for Blazor.

Telerik UI for Blazor & WPF C# Blazor C# WPF / XAML Design System WCAG HTML Kendo CSS with SASS JavaScript +more
06/2021 - 03/2022

DAAD (via queo GmbH)

Relaunch of research-in-germany.org

Due to a Magnolia instance that had been poorly maintained by various service providers over the years, a completely new system had to be developed and launched for the relaunch in a very short time.

Magnolia FreeMarker HTML CSS SASS Factories with Bootstrap 5 JavaScript ECMA6+ + more
06/2021 - 12/2021

Carl Zeiss AG (via diconium)

Maintenance of the B2B Shop

Supporting the internationally distributed team in the maintenance, expansion, and reconstruction of the frontend for the B2B shop shop.metrology.zeiss.de, based on Intershop Commerce.

Intershop Commerce HTML CSS SASS Bootstrap 3 JavaScript Java + more
01/2020 - 05/2021

Bechtle AG (via Neofonie GmbH)

Performance Optimization & Lead Development

Maintenance of the Magnolia CMS for bechtle.com with a focus on performance and speed optimization. Took over lead programming as well as consulting, coaching the team, and establishing best practices. Also helping out with bottlenecks in SAP Hybris eCommerce.

SAP Hybris eCommerce Magnolia FreeMarker JSP/JSTL HTML CSS/SASS BEM JavaScript ECMA6+ Java Python +more
07/2019 - 12/2019

BASF Business Services GmbH

Performance Increase by 1440%

Emergency deployment for a significant increase in performance and speed on basf.com. Development of frontend components in Adobe Experience Manager (AEM) and training the team in modern CSS architecture ('CSS as a Programming Language').

Adobe Experience Manager (AEM) HTML CSS LESS TypeScript JavaScript ECMA6+ +more
03/2019 - 06/2019

mobilcom-debitel GmbH

Hybris SmartEdit Component Development

Working as a Developing Consultant on various Hybris shops (including for mobilcom-debitel.de, Saturn & Media Markt). Development of CMS components for SmartEdit, service and maintenance, as well as mentoring and training in CSS architecture.

SAP Hybris eCommerce JSP/JSTL HTML CSS/SASS HTML CSS SASS Foundation 6 Atomic-OO-BEVM-ITCSS + more
12/2018 - 02/2019

DEICHMANN SE

Optimization of the SAP Hybris 5 Platform

Engaged as a Developing Consultant to optimize the usability, development velocity, and CSS architecture of the existing system while preparing for the migration to Hybris 6.

SAP Hybris eCommerce JSP/JSTL HTML CSS SASS Foundation 6 BEM + more
08/2018 - 11/2018

Kühne + Nagel (AG & Co.) KG

Refactoring of International Booking Routes

Optimization and expansion of international booking routes for air, sea, and land freight with a focus on responsive design, performance, and usability. Refactoring of CSS/HTML to a generic class system, including training and mentoring in CSS architecture and best practices.

Design Sytem / Core Team HTML CSS SASS Bootstrap 4 Atomic-OO-BEM-ITCSS + more
04/2018 - 07/2018

Rossmann Zentrale GmbH

Consulting & Mentoring for Relaunch

Training the internal team in Hybris (Storefront/JSP/JSTL), enterprise templating, modern CSS architecture, and established best practices for the attempted relaunch of rossmann.de. And some hands-on support with the Magnolia CMS.

SAP Hybris eCommerce Magnolia FreeMarker JSP/JSTL HTML CSS/SASS JavaScript Bootstrap 4 Atomic-OO-BEM-ITCSS + more
01/2018 - 03/2018

Robert Bosch GmbH (via diconium)

Development of the Bosch IoT Marketplace

As a Frontend Consultant, advised an international team across languages, continents, and cultures, and provided training through 'Leading By Example' to technically stabilize the already launched project and bring it back to project reality.

SAP Hybris eCommerce JSP/JSTL HTML CSS SASS Bootstrap 3 JavaScript ECMA6+ + more
1998 - Present

Complete Professional Journey

All Branches of My Career Tree

The projects shown above represent just the most recent branches of my professional oak tree. For a comprehensive view of all 20+ years of experience, including earlier projects, additional clients, and the full growth story from roots to crown, please explore my complete curriculum vitae.

Deep Roots of Experience

Like a mighty oak with roots extending deep and wide, my expertise spans across technologies and methodologies

20+ Years Experience

Deep-rooted expertise in crafting sophisticated frontend solutions

Modern Architectures

Expert in design systems, component libraries, and modern CSS architectures

Performance Optimization

Achieved up to 1440% performance improvements on enterprise platforms

WCAG Compliance

Accessibility-first approach in all design systems and implementations

Enterprise Experience

Trusted by BASF, Zeiss, Bechtle, and other Fortune 500 companies

Team Leadership

Mentoring and coaching teams to adopt best practices and modern standards

Professional Network & Client Portfolio

Like deep tree roots that span wide underground, my professional network encompasses diverse industries and leading companies across Europe. Each collaboration has strengthened the foundation of expertise and trust.

Enterprise & Technology

BASF, Bechtle, Carl Zeiss, Robert Bosch, Cisco, Deutsche Telekom, mobilcom-debitel, Mercedes-Benz Bank, Komatsu, HZD Hessische Zentrale für Datenverarbeitung, Shure (Global)

Retail & Commerce

DEICHMANN, Rossmann, bonprix, diconium, hessnatur, TUI Group, DER Touristik, Kühne + Nagel, Aserto, Campoint, VideoLoad, hmmh multimediahaus AG, Neofonie

Finance & Public Sector

Bantleon, GEFA Bank, BIG Direkt, BKK24, Franke & Bornberg, Börsen AG, VGH Stiftung, Landeskirche Hannover, DAAD: Deutscher Akademischer Austauschdienst, enercity

Media & Culture

Julius Club, Kestner Gesellschaft, Literaturfest Niedersachsen, Stiftung Niedersachsen, Medienhaus Hannover e.V.

Industry & Manufacturing

Niedersachsenmetall, ADK Verband, NSKS, Promecon, Gehrke Econ, Nachtsichttechnik Jahnke

Research & Development

Research in Germany, queo, and many innovative startups and medium-sized enterprises across diverse sectors

Let's Grow Together

Ready to cultivate your next project with 20 years of frontend expertise? Let's connect and create something remarkable.

Direct Contact

Available for consulting and project discussions

Collaboration

Open to interesting frontend challenges

Mentoring

Coaching teams in modern web development