Jens Freudenau - Senior PHP Developer

Q: Where is Jens based?

Jens is based in Berlin, Germany .

Q: What languages does Jens speak?

Jens speaks the following languages: German (Native), English (Intermediate) .

Q: How many years of experience does Jens have?

Jens has at least 13 years of experience. During this time, Jens has worked in at least 2 different roles and for 10 different companies . The average length of individual experience is 1 year and 2 months . Note that Jens may not have shared all experience and actually has more experience.

Q: What is Jens's latest experience?

Jens's most recent position is Senior PHP Developer at Own Project .

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

In recent years, Jens has worked for Own Project , EnBW , zone35 , kemas , and powercloud/EnBW .

Q: Which industries is Jens most experienced in?

Jens is most experienced in industries like Automotive , Information Technology (IT) , and Utility Services . Jens also has some experience in Energy , Aerospace and Defense , and Manufacturing .

Q: Which business areas is Jens most experienced in?

Jens is most experienced in business areas like Information Technology (IT) , Product Development , and Quality Assurance (QA) .

Q: Which industries has Jens worked in recently?

Jens has recently worked in industries like Information Technology (IT) , Utility Services , and Energy .

Q: Which business areas has Jens worked in recently?

Jens has recently worked in business areas like Information Technology (IT) , Product Development , and Quality Assurance (QA) .

Recommended expert

Berlin, Germany

Experience

Feb 2025 - Apr 2025

3 months

Senior PHP Developer

Own Project

Developing an app to mirror the stock portfolio
Environment: Laravel 12, PHP 8.4, MySQL, Git, IntelliJ, GitHub, AlpineJS, TailwindCSS

Nov 2024 - Feb 2025

4 months

Senior PHP Developer

Own Project

Developing a multi-domain CMS
Environment: Laravel 11, PHP 8.2, MySQL, Git, IntelliJ, GitHub, PHPUnit, TailwindCSS

Jan 2024 - Oct 2024

10 months

Senior PHP Developer

EnBW

Fixing bugs / debugging
Developed new features for the web application in PHP 7.4
Unit tests in PHPUnit and Codeception
Creating API interfaces
Environment: Slim Framework, PHP 7.4, MySQL, Git, IntelliJ, API, Swagger, AWS, GitLab, Powercloud, Edifact, Code review

Nov 2021 - Dec 2023

2 years 2 months

Senior PHP Developer

zone35

Fixing bugs / debugging
Developed new features for the web application (Assisto) in PHP 7.3/8.1, TypeScript, ReactJS
PHP unit tests and Codeception
Creating API interfaces for the mobile apps
Environment: CakePHP 3, PHP 8.1, MySQL, Git, IntelliJ, REST API, Swagger (OpenAPI), TypeScript, ReactJS

May 2021 - Nov 2021

7 months

Senior PHP Developer

kemas

Fixing bugs / debugging
Developed new features for the web application in PHP 7.3, TypeScript, Electron JS and Node JS
Expanding the API interfaces
Environment: PHP 7.3, MySQL, Git, IntelliJ, REST, XML, Electron JS, Node JS, REST API, Swagger (OpenAPI)

Apr 2020 - Apr 2021

1 year 1 month

Senior PHP Developer

powercloud/EnBW

Convert EDIFACT messages to XML format
Convert XML messages to EDIFACT
Validate messages for correctness
Send messages via API
Created PHP unit tests
Environment: PHP 7.3, PHPUnit, Slim, MySQL, Git, IntelliJ, REST, XML, EDIFACT, Bitbucket, Bamboo, REST API, Swagger (OpenAPI), MariaDB

Dec 2018 - Mar 2020

1 year 4 months

Senior PHP Developer

bamboo Software OHG

Fixed bugs
Developed new features in PHP 5
Environment: MySQL, PHP 5, Symfony Framework 2.6, Zend Framework 1.11, jQuery, CSS, HTML5, XML, GitLab

Dec 2017 - Mar 2018

4 months

Senior PHP Developer

LA Kreis Dortmund

Display tenders from Excel spreadsheets in HTML
Allow clubs to register for competitions
Import participants into third-party software
Developed new features for the website in PHP 7
Created PHP unit tests
Environment: PHP 7, Laravel 5.4, MySQL, jQuery, Traits, Repository Pattern, CSS, HTML, PHPUnit, Mockery, GitHub, Bugsnag, Mailgun

Nov 2016 - Sep 2017

11 months

Berlin, Germany

Senior PHP Developer

airberlin

Fixed bugs
Developed new features in PHP 5
Adapted legacy code
Removed bugs in the PWA
Environment: MySQL, PHP 5, Zend Framework 1.12, jQuery, PWA, CSS, HTML5, XML, Jira, Confluence, Jenkins, Bitbucket, Scrum, SOAP, API, JavaScript, PhpStorm, SVN, Windows, Atlassian Confluence

Sep 2016 - Nov 2016

3 months

Software Developer

D-Trust Berlin / Bundesdruckerei

Implement new requirements and security requirements
Implement customer requirements OWASP 1 and 4
Convert Zend Framework model classes to use stored procedures
Write PHP unit tests for the Zend DB module
Consult on improving work organization
Environment: PHP 5/5.5, Zend Framework 1.12, SVN, Kanban, MySQL, Atlassian JIRA, IntelliJ, Ubuntu Linux, Windows, Atlassian Confluence, FishEye

Sep 2011 - Sep 2016

5 years 1 month

Halle (Saale), Germany

Software Developer

Automotive, DB Rent Car Sharing

Fixing bugs
Completing customer requirements in PHP 4
Operating and adapting communication between the vehicle on-board computers and the servers
Extending API functionalities
Creating and enhancing the API to connect external websites and apps
Further developing the interface of the car-sharing customers' web server to the access-control middleware of the on-board computers for short-term vehicle rentals
Programming a microservice in Ruby to retrieve driving data from the on-board computers
Co-responsible for operating the on-board computer access-control technology in the car-sharing division
Managing vehicles and rentals for around 200 car-sharing providers in Germany
Environment: PHP 4/5, MySQL, XML/WSDL, Git/CVS, Ruby, Gerrit, Jenkins, Scrum, Docker, Java, Mockito, car-sharing on-board computer technology, API, AT commands, Shell, IntelliJ, MSSQL, Atlassian JIRA, Atlassian Confluence, Kanban, PHPUnit, Sinatra

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Automotive (5 years), Information Technology (3.5 years), Utilities (2 years), Energy (1 year), Aerospace and Defense (1 year), and Manufacturing (0.5 years).

Automotive

Information Technology

Utilities

Energy

Aerospace and Defense

Manufacturing

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (12.5 years), Product Development (4 years), and Quality Assurance (1 year).

Information Technology

Product Development

Quality Assurance

Skills

Php Version 4-8
Mysql (Sql)
Javascript
Typescript
Reactjs
Openapi/swaggerui
Rest Api
Phpunit
Codeception
Git
Linux
Zend Framework
Laravel
Cakephp
Symfony
Slim
Edifact
Powercloud
Tailwindcss

Languages

German

Native

English

Intermediate

Education

Oct 1988 - Jun 1993

University of Applied Sciences Braunschweig/Wolfenbüttel and Osnabrück

FH Diplom Engineer, focus on manufacturing technology · Mechanical Engineering · Osnabrück, Germany

Certifications & licenses

Certified Technical Consultant SAP Basis

MySQL

Scrum

Further training as a multimedia developer

Profile

Created

August 2025

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Frequently asked questions

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

Where is Jens based?

Jens is based in Berlin, Germany.

What languages does Jens speak?

Jens speaks the following languages: German (Native), English (Intermediate).

How many years of experience does Jens have?

Jens has at least 13 years of experience. During this time, Jens has worked in at least 2 different roles and for 10 different companies. The average length of individual experience is 1 year and 2 months. Note that Jens may not have shared all experience and actually has more experience.

What roles would Jens be best suited for?

Based on recent experience, Jens would be well-suited for roles such as: Senior PHP Developer, Software Developer.

What is Jens's latest experience?

Jens's most recent position is Senior PHP Developer at Own Project.

What companies has Jens worked for in recent years?

In recent years, Jens has worked for Own Project, EnBW, zone35, kemas, and powercloud/EnBW.

Which industries is Jens most experienced in?

Jens is most experienced in industries like Automotive, Information Technology (IT), and Utility Services. Jens also has some experience in Energy, Aerospace and Defense, and Manufacturing.

Which business areas is Jens most experienced in?

Jens is most experienced in business areas like Information Technology (IT), Product Development, and Quality Assurance (QA).

Which industries has Jens worked in recently?

Jens has recently worked in industries like Information Technology (IT), Utility Services, and Energy.

Which business areas has Jens worked in recently?

Jens has recently worked in business areas like Information Technology (IT), Product Development, and Quality Assurance (QA).

What is Jens's education?

Jens holds a Bachelor in Mechanical Engineering from University of Applied Sciences Braunschweig/Wolfenbüttel and Osnabrück.

Does Jens have any certificates?

Jens has 4 certificates. Among them, these include: Certified Technical Consultant SAP Basis, MySQL, and Scrum.

What is the availability of Jens?

Jens is immediately available for suitable projects.

What is the rate of Jens?

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