Matthias Voit - Performance analysis, monitoring, and front-end development for the e-commerce portal of a leading sports retailer

Stammbach, Germany

Experience

Jul 2021 - Apr 2025

3 years 10 months

Austria

Performance analysis, monitoring, and front-end development for the e-commerce portal of a leading sports retailer

solleo IT GmbH

The assignment mainly includes securing, analyzing, optimizing, and redeveloping around front-end, front-end performance, PageSpeed, and Core Web Vitals. Alongside regular front-end tasks, it involves continuous investigation, monitoring, development, and implementation of performance optimization solutions.

Technologies used:

Vue2
Nuxt.js (v2)
TypeScript
JavaScript
Node.js
Sass
Tailwind
HTML5
CSS 3.0
GIT
NPM
Webpack
Storybook
Responsive web design
Sentry
SonarQube
Jenkins
Jira
Confluence
DynamicYield
Google Tag Manager
Google Analytics
Google Search Console
SpeedCurve

Tasks:

Analyze and develop optimization opportunities in the existing codebase
Implement new features and improvements
Performance check of newly developed features
Implement front-end components per requirements and design guidelines

Jun 2021 - Sep 2021

4 months

Germany

Front-end development for a German automaker

solleo IT GmbH

The assignment involved support in front-end development. The online shop of a German automaker was expanded, focusing on the ordering flow.

Technologies used:

Vue2
TypeScript
JavaScript
Sass
GIT
NPM
Jira
Responsive web design

Tasks:

Implement components per requirements and style guide
Integrate components into the existing shop and car configurator

Mar 2021 - Apr 2021

2 months

Front-end development for an online construction tool

solleo IT GmbH

This assignment supported the front end of an online tool for managing and calculating construction projects. Key was using Vue’s Composition API to ease future upgrade from version 2 to 3, implementing with TypeScript, and creating generic components.

Technologies used:

HTML5
CSS 3.0
TypeScript/JavaScript
Sass
Vue2
CompositionAPI
Docker
GIT
NPM
Webpack
Jira
Living Styleguide
Responsive web design

Tasks:

Implement code architecture and components

Apr 2020 - Feb 2021

11 months

Design & implementation of an e-commerce portal

solleo IT GmbH

The goal was a specialized e-commerce portal for new trend products. We developed both front-end and back-end to meet unique requirements, including optimized content and search result pages, a partner admin area, and internal tools for invoicing and promotions.

Technologies used:

HTML5
CSS 3.0
JavaScript
Vue2
Scss
PHP
PHPStorm
NPM
Webpack
ProcessWire
Cockpit

Tasks:

Design and implement portal structure
Design & UX concept and implementation
Implement front-end and back-end
Ongoing feature development

May 2019 - Mar 2020

11 months

Creation of a white-label multi-portal framework

solleo IT GmbH

This project built a white-label multi-portal application to modern web standards, considering features of an existing application. We planned a flexible front-end architecture, reviewed and adjusted provided designs for UX, split into reusable components, and defined front-end tasks.

We also set up development infrastructure, implemented the codebase, provided the page structure, ready-to-use components, and unit tests.

Technologies used:

HTML5
CSS 3.0
JavaScript
Sass
Vue2
Vuex
Jest
Figma
PHPStorm
GIT
NPM
Webpack
Jira
Atomic Design
BEM
Living Styleguide
Responsive web design
Cross-browser & cross-device compatibility

Tasks:

Plan front-end architecture
Design review & adjustments
Subproject planning (tickets, coordination)
Implement architecture, components, and tests

Jun 2018 - May 2019

1 year

Enhancement of a travel booking portal

solleo IT GmbH

Tasks included feature development, bug analysis, and fixes for a travel booking portal. Focus was search results, presentation pages, and booking flow, requiring quick onboarding to a legacy codebase.

We also evaluated and developed quality and SEO techniques for the current portal and future projects.

Technologies used:

HTML5
CSS 3.0
JavaScript
jQuery
Sass
Vue.js
Vue2
TestCafe
PHPStorm
GIT
NPM
Webpack
Grunt
Jira
Bitbucket
Responsive web design
Cross-browser & cross-device compatibility

Tasks:

Front-end development
Bug analysis & fixes
Optimize code structures
Implement new features
Evaluation & consulting

Jul 2017 - Sep 2017

3 months

Cologne, Germany

Enhancement of finance and insurance portals

solleo IT GmbH

At Sevenval in Cologne, tasks included optimizing code structure, bug fixing, and new front-end requirements for two comparison portals in finance and insurance. This required fast, independent onboarding to the code, new techniques, and a new language. We used HTML5, CSS 3.0, JavaScript, and XSL.

Technologies used:

HTML5
CSS 3.0
JavaScript
Sass
XSL
REST
SOAP
PHPStorm
GIT
NPM
Kiki
Rollup
Redmine
Jira
Responsive web design
Progressive enhancement
Cross-browser compatibility

Tasks:

Front-end for insurance, finance, and comparison portals
Fast, independent onboarding to code, new techniques, and language
Optimize code structure
Implement new features
Bug fixing

Oct 2016 - Dec 2016

3 months

Karlsruhe, Germany

Update & enhancement of a leading German ISP

solleo IT GmbH

For 1&1 Mail & Media in Karlsruhe, we updated landing pages and order flows for two brands in energy and mobile. We quickly learned the in-house templating system and built features in pure in-house code, avoiding third-party frameworks. Used HTML5, CSS 3.0, vanilla JS, and PHP.

Technologies used:

HTML5
CSS 3.0
JavaScript
Vanilla JS
PHPStorm
GIT
Jira
Confluence
Responsive web design
Progressive enhancement
Cross-browser compatibility

Tasks:

Front-end for energy and mobile
Quick onboarding to in-house templating
Implement new features
Custom development without external code
Merge & release new builds

Jun 2016 - Sep 2016

4 months

Munich, Germany

Update & enhancement of a German automaker’s website

solleo IT GmbH

At SapientNitro in Munich, I updated and enhanced a southern German automaker’s site. Tasks included quick onboarding, bug fixing, and new feature implementation using HTML5, CSS 3.0, less, JavaScript, jQuery, Handlebars.js, and grunt. Work in an international team; project language English.

Technologies used:

HTML5
CSS 3.0
less
JavaScript
jQuery
Handlebars.js
PHPStorm
AEM
grunt
Jira
Confluence
GIT
sightly
Responsive web design
UX
User stories
Progressive enhancement
Cross-browser compatibility
Kanban

Tasks:

Automotive front-end development
Quick onboarding, bug fixing & enhancements
Implement new features
Code review and merge pull requests

Apr 2016 - Apr 2016

1 month

Revamp & modernization of a corporate website

solleo IT GmbH

We updated an existing corporate site to modern standards. The HTML 4.1 structure was revised to HTML5, adding CSS 3.0, jQuery, JavaScript, and parts of Twitter Bootstrap’s responsive grid. We maintained progressive enhancement, cross-browser compatibility, and responsive design. We implemented dynamic content loading with jQuery, migrated content into a CMS, and integrated structured data tags and Google Data Highlighter. We linked Google Analytics and Webmaster Tools.

Technologies used:

HTML5
CSS 3.0
JavaScript
jQuery
PHP
MySQL
Twitter Bootstrap
Structured Data
PHPStorm
ProcessWire
Performance optimization
SEO
Responsive web design
Google Analytics
Google Webmaster Tools
Google Data Highlighter
UX
User stories
Progressive enhancement
Cross-browser compatibility

Tasks:

Modernize HTML, CSS, JavaScript
Dynamic content loading
Integrate CMS and port content
SEO and performance-oriented coding

Oct 2015 - Jun 2018

2 years 9 months

Design, implementation, and support of a corporate website

solleo IT GmbH

A sales-channel company needed a site for representation and lead generation. We created design and structure from user stories, produced SEO-based content, and set a long-term content plan. The site was built for SEO and performance, and since launch it’s continuously monitored and optimized using analytics tools.

Technologies used:

HTML
CSS 3.0/2.0
OOCSS
JavaScript
jQuery
PHP
MySQL
PHPStorm
ProcessWire
Performance optimization
SEO
Responsive web design
Google Analytics
Google Webmaster Tools
UX
User stories
Web content management
Progressive enhancement
Cross-browser compatibility

Tasks:

SEO research & concept
Structure, layout, and design concept
SEO-focused coding
Create SEO-friendly content
Plan long-term content strategy
Ongoing support, expansion, and optimization

Jun 2015 - Apr 2017

1 year 11 months

Munich, Germany

Design, implementation, and support of a real estate presentation site

solleo IT GmbH

For a new luxury property in Munich, we built an SEO-optimized presentation site. We did SEO research and competitor analysis, defined structure, imagery, user stories, and UX. Implementation focused on SEO and performance, and content writing ensured readability and SEO. Since launch we provide continuous monitoring, analysis, and optimization.

Technologies used:

HTML
CSS 3.0/2.0
OOCSS
JavaScript
jQuery
PHP
MySQL
PHPStorm
ProcessWire
Performance optimization
SEO
Responsive web design
Google Analytics
Google Webmaster Tools
UX
User stories
Web content management
Progressive enhancement
Cross-browser compatibility

Tasks:

SEO research & concept
Structure, layout, and design concept
SEO-focused coding
SEO text consulting
Ongoing support, expansion, and optimization

Mar 2015 - May 2015

3 months

In-house web solution for order processing

solleo IT GmbH

We built a system for order handling from acceptance through production to delivery. It managed customer data (contacts, special prices, recurring options), product data (base info, variations, prices), and order history and templates. On-site, we analyzed processes, gathered requirements, and created use-case–based concepts for implementation.

Technologies used:

HTML
CSS 3.0/2.0
OOCSS
JavaScript
jQuery
AJAX
JSON
PHP
OOP
PHPStorm
ProcessWire
Performance optimization
Use cases
Scrum
Cross-browser compatibility

Tasks:

Analyze existing in-house solutions
Create use-cases, requirement analysis, detailed concept, milestone plan
Prioritize implementation
Testing
Roll-out

May 2014 - Sep 2014

5 months

Technical implementation of a performance- and SEO-optimized company site with search result lists

solleo IT GmbH

The client launched a new catalog product line and needed a product-specific site. Structure, layout, and content were provided. The focus was SEO, performance, and mobile optimization for high-resolution images on mobile devices. We also cataloged all products with details for future use in a shop system.

Technologies used:

HTML
CSS 3.0/2.0
OOCSS
JavaScript
jQuery
AJAX
PHP
OOP
MySQL
PHPStorm
Performance optimization
SEO-oriented coding
Responsive web design
Progressive enhancement
Cross-browser compatibility

Tasks:

Performance-optimized coding
SEO-optimized coding
Implement with responsive design, progressive enhancement, cross-browser compatibility
Launch site

Jan 2014 - Apr 2025

11 years 4 months

Stammbach, Germany

Managing director, software developer, SEO professional, web content manager

solleo IT GmbH

Clients include:

1&1 Mail & Media GmbH
SapientNitro
FTI Touristik GmbH
Sevenval Technologies GmbH

Jul 2012 - Apr 2014

1 year 10 months

Germany

Software developer (Lead Front-End Developer)

anwalt.de services AG

Subproject lead for front-end on [link], focusing on optimizing and extending existing portals: profile pages, search results, article pages, landing pages, order flow, and content pages.

Beyond front-end, I optimized and extended back end and database structure.

Technologies used:

HTML
CSS 3.0/2.0
OOCSS
JavaScript
jQuery
AJAX
JSON
PHP
OOP
Smarty
TypoScript
SVN
Jira
MySQL
PHPStorm
DbVisualizer
Typo3
Responsive web design
SEO
HTML newsletters (static & responsive)
phpList

Tasks:

Front-end optimization
Convert pages to responsive design & progressive enhancement
CSS optimizations
Design & implement in-house performance-optimized front-end framework
Replace inline styles with framework classes
Design & implement CSS manager to group and minify CSS files into one
Analyze & optimize site via caching, cookiefree domains, server plugins
JS optimizations
Remove inline JS, refactor to OOP JS & jQuery
Design & implement JS manager to group/minify scripts into one
Graphic optimizations
Manage graphic resources for performance
Design & implement sprite manager for project and group sprites
Refactor existing code into OOP reusable logic
Implement validators
Implement web widgets
Design & implement dynamic elements via jQuery, AJAX, JSON
Build new lawyer profile view (Microsite)
Implement new registration area
Implement partner microsites (front-end, data model, database)
Design & implement central stage-based configuration management
Implement mailing manager for template-based multipart emails
HTML newsletters
Implement & adjust SEO pages
Implement SEO structure for steuerberater.net
Document coding standards

Aug 2008 - Jul 2012

4 years

Germany

Software developer

hotel.de AG

Responsible for MICE, corporate rates, affiliates, and HotelCenter, including maintenance, optimization, and new features. Covered back end, database, and front end.

As lead subproject manager, I handled technical implementation of the new hotel.de redesign.

Technologies used:

HTML
CSS 3.0/2.0
OOCSS
JavaScript
jQuery
AJAX
JSON
XML
C#
OOP
ASP.Net
MVVM
WPF
MVC3
MSSQL
Visual Studio 2010
MS SQL Management Studio
Scrum

Tasks:

Enhance hotel.de MICE portal “MARS” (front end, back end, DB for bookers, hoteliers, agents)
Corporate rates implementation
Build internal Windows tool for rate data import and management (front end, back end, DB)
Migrate old rate data
Design & implement data processing and correction plugins/services
Implement TravelManager web component
Unit tests
Refactor & optimize SQL queries
Affiliate center management
Implement new affiliate concept with new modules (front end, back end, DB)
Design & implement crawler for affiliate page integration analysis
Redesign / relaunch: lead subproject manager for technical design implementation
Performance-focused front end
HotelCenter module: new front-end area for hoteliers to analyze and optimize rates