René Schmidt - WordPress and PHP Web Application Developer

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Quickborn, Germany

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Experience

Apr 2021 - May 2021

2 months

Rostock, Germany

CRM Developer

CiS GmbH

Developed a greenfield CRM for managing incoming customer requests for a municipal utility provider
Implemented with PHP/Symfony 5, EasyAdmin, Doctrine ORM and Oracle XE
Handed over to CiS GmbH after initial groundwork as planned

Apr 2019 - Jun 2022

3 years 3 months

Hamburg, Germany

Software Developer

E.ON SE

Frontend and backend development of a Ruby on Rails and Postgres application for managing municipal concessions
Coordinated operations
Integrated OIDC Ping ID with JWT and PKCE
Introduced static code analysis with SonarQube
Increased test coverage to ~95 %

Feb 2018 - Dec 2018

11 months

Hamburg, Germany

API and Test Automation Developer

Gruner+Jahr

Continued development of a REST API web service interface between single sign-on system and MAPP Customer Engagement Platform using PHP, MySQL, Symfony, Doctrine, PHPUnit, Linux and REST API
Developed an Amazon AWS Lambda worker in Java to send SQS messages via Measurement Protocol to Google Analytics (EDI)
Developed a Java and PHP OAuth2 SDK for SSO tenants
Performed extensive refactoring of the reseller interface
Optimized database performance
Devised a content security policy concept
Conducted microservice refactoring
Developed load tests with Apache JMeter and Docker
Introduced static code analysis with SonarQube

Sep 2015 - Jul 2017

1 year 11 months

Hamburg, Germany

API and Test Automation Developer

Gruner+Jahr

Developed a REST API web service interface between single sign-on system and MAPP Customer Engagement Platform using PHP, MySQL, Symfony, Doctrine, PHPUnit, Linux and REST API
Devised a new test concept; refactored unit tests and functional tests (PHPUnit), developed and introduced unit testing middleware, reducing test suite runtime by 60–99 %
Implemented event tracking to Amazon AWS SQS
Ensured code compatibility with PHP E_STRICT
Advanced migration from PHP 5.3 to 5.4
Prepared and supported migration to Symfony 2.8
Introduced Doctrine fixtures for database provisioning for unit and functional tests
Adopted strong Scrum and Kanban orientation (“Scrumban”)

Oct 2013 - Dec 2023

10 years 3 months

Stuttgart, Germany

Blog, Forum and Wiki Service Developer

Mercedes Benz AG

Web application management; frontend and backend development for WordPress and plugin development with Linux system administration
Application and component development using PHP, CSS optimization, Twitter Bootstrap, LESS, HTML5, JavaScript according to internal specifications
Migration from WordPress 3.x to 4.x to 5.x
Consulting and support for internal blog and forum clients
Incident and request handling
Test case management and implementation with Postman and a custom Go-based system
Security reviews of LAMP stack
Development of REST API server in Go with OpenAPI (Swagger) for automatic user account deprovisioning
Maintenance of CA Single Sign-On plugin (SSO, Ping ID) for WordPress and Apache httpd (WebAgent)
Bash shell scripting and synchronization of Oracle databases and Confluence
Administration of Piwik/Matomo web analytics and Icinga monitoring with Linux sysadmin
Operation and administration of Atlassian Confluence 4.3 and 5.8
Scrum-based work
Prepared and executed Ansible introduction for DevOps
Integration of OIDC Ping ID with proprietary entitlement management system; test case development and integration enhancement

Oct 2010 - Jul 2013

2 years 10 months

RIA Developer (Freelancer)

Adternity GmbH

Developed XML exporter and REST electronic data interchange (EDI) interfaces to Basecamp, address data verification and customer CMS
Wrote XML importer for ad campaigns
Developed parts of the ExtJS web GUI
Authored PHPUnit and Siesta tests
Administered Jenkins server for continuous integration and automated unit testing
Conducted static code analysis with PHP CodeSniffer

Sep 2007 - Mar 2008

7 months

YUI RIA Frontend Developer (Freelancer)

Pixelpark Solutions GmbH

Developed a rich web application frontend using HTML, CSS, JavaScript and YUI framework
Collaborated closely with Apache Struts backend via XML-RPC

Jan 2007 - Aug 2010

3 years 8 months

WordPress/Web Server Developer (Freelancer)

Smashing Media GmbH & DrWeb.de

Responsible for page load optimization using HTML, CSS and JavaScript
Optimized server performance with Apache, Varnish and MySQL
Developed a paywall based on CodeIgniter and integrated a paywall bridge to the Magento shop via XML-RPC
Set up Varnish servers and integrated into a high-traffic WordPress environment
Developed a custom CRM for clients
Administered Magento shops, implemented payment systems like PayPal and Worldpay
Developed Magento and WordPress plugins for workflow optimization, SEO improvements, refactoring third-party plugins and security patches, and an alternative WordPress search plugin based on Apache Lucene
Converted 3,000 static HTML pages into WordPress posts via script for site relaunch
Worked according to Scrum principles

Mar 2005 - Aug 2010

5 years 6 months

Editor (Freelancer)

Smashing Media GmbH & DrWeb.de

Worked as editor for Smashing Magazine and Dr.Web publications

Dec 2001 - Jan 2002

2 months

Various Roles

Various

Worked on projects for Mediebruket AS (Norway), 161MEDIA Deutschland GmbH, Commindo Media GmbH, Medienzentrum Schlichtmann und Werk GmbH & Co. KG, P.I.T Partner Internal Transport Netherlands and others

Feb 2001 - Nov 2001

10 months

Technical Project Manager

nikotel AG

Developed and implemented a customer portal for VoIP users based on SixCMS

Apr 2000 - Jan 2001

10 months

Web Developer and Junior Technical Project Manager

Tiscali AG

Developed interfaces between CMS and news providers such as dpa for events like Formula 1 and the Olympic Games

Industry experience

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

Experienced in Automotive, Media and Entertainment, Information Technology, Utilities, and Telecommunication.

Automotive

Media and Entertainment

Information Technology

Utilities

Telecommunication

Business area experience

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

Experienced in Information Technology, Product Development, Quality Assurance, Production, Project Management, and Operations.

Information Technology

Product Development

Quality Assurance

Production

Project Management

Operations

Skills

Php/Symfony, Ruby On Rails: Development Of Dynamic Web Applications (Including Single-Page Applications)
Oauth2 & Openid Connect (Oidc) Integration In Enterprise Environment: Ping Id, Azure, Including Multi-Factor Authentication And Jwt And Pkce
Linux Web Server Administration (Apache Web Server, Nginx, Varnish, Mysql/Mariadb, Ansible, Devops)
Ci/Cd Pipelines (Continuous Integration, Continuous Delivery) Using Jenkins, Bamboo, Gitlab Ci, Gitea/Forgejo And Github Actions
Test Automation: Phpunit, Postman
Frontend Development, Rich Interactive Web Applications With Javascript/Ajax, Jquery, Extjs, Bootstrap
Development Of Rest Api Servers With Go, Openapi (Swagger)
Experience Integrating Web Frontends Via Middleware With Xml-Rpc Or Json
Development Of Modules And Plugins For Wordpress And Magento

Languages

German

Native

English

Advanced

Education

Oct 2008 - Jun 2010

Fernuniversität Hagen

Business Informatics · Hagen, Germany

Oct 2003 - Jun 2006

Fernuniversität Hagen

Computer Science · Hagen, Germany

Oct 1999 - Jun 2000

Staatliche Gewerbeschule Ernährung und Hauswirtschaft Brekelbaums Park

Technical secondary school diploma, advanced technical college entrance qualification · Social Pedagogy · Hamburg, Germany

...and 1 more

Certifications & licenses

TeleTrusT Information Security Professional (TISP/T.I.S.P.)

Bundesverband IT-Sicherheit e.V. (TeleTrusT)

TeleTrusT Information Security Professional (TISP/T.I.S.P.)

Bundesverband IT-Sicherheit e.V. (TeleTrusT)

In-Memory Data Management by Prof. Dr. h.c. mult. Hasso Plattner/OpenHPI

Statistics

Experience

Total positions 12

Experience in Automotive 10 y

Avg length 2 y 6 m

Longest experience 10 y 2 m

Global experience

Countries worked in 1 (Germany)

Primary country Germany

Expertise

Recent roles CRM Developer, Software Developer, API and Test Automation Developer

Main industries Automotive, Media and Entertainment, Information Technology

Main business areas Information Technology, Product Development, Quality Assurance

Qualifications

Certifications earned 5

Profile

Member since

March 2024

Last update

May 2025

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Frequently asked questions

Have questions? Find more information here.

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

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

René has at least 20 years of experience. During this time, René has worked in at least 11 different roles and for 10 different companies. The average length of individual experience is 2 years and 8 months. Note that René may not have shared all experience and actually has more experience.

Based on recent experience, René would be well-suited for roles such as: CRM Developer, Software Developer, API and Test Automation Developer.

René's most recent position is CRM Developer at CiS GmbH.

In recent years, René has worked for E.ON SE and Mercedes Benz AG.

René is most experienced in industries like Automotive, Media and Entertainment, and Information Technology. René also has some experience in Utilities, Telecommunication, and Transportation.

René is most experienced in business areas like Information Technology, Product Development, and Quality Assurance. René also has some experience in Production, Project Management, and Operations.

René has recently worked in industries like Automotive and Utilities.

René has recently worked in business areas like Information Technology, Operations, and Quality Assurance.

René attended Fernuniversität Hagen for Business Informatics.

René has 5 certificates. Among them, these include: TeleTrusT Information Security Professional (TISP/T.I.S.P.), TeleTrusT Information Security Professional (TISP/T.I.S.P.), and Business Process Modeling and Analysis by Prof. Dr. Mathias Weske/OpenHPI (BPMN).

The availability of René needs to be confirmed.

Daily rate distribution

0 2 4 6 8

<€800 €800-960 €960-1120 €1120-1280 €1280+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Average rates for similar positions

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Daily rate avg. 918 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

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Median rate 860 €

The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.

Calculated based on our freelancers’ daily rates as of 7 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.