Freelance Senior Web Application Developer

Senior Web Application Developer
Freelance Senior Web Application Developer
PHP back-end, Laravel, LAMP, partly DevOps

Hi, my name is Carsten and I'm a Senior Web Application Developer with about 15 years of experience (13 years professional) in planning, building and project management.  


Next to run  my own SaaS company "Projectstage" (current main project I am available to freelance or contract based projects. Ideally this contains the opportunity of working remote.


During the years I developed myself up to a kind of full stack LAMP developer focused on using PHP and relational databases for building object oriented and business related back-end/front-end applications/libraries. Most of the time my daily business contains creating RESTful API based systems as well as consuming APIs - such as Twitter, Facebook, PayPal, … - to integrate them into or on top of web applications. This part includes analysis, planning, documentation as well as CI and deployment. 


Next to web application development, LAMP related system administration tasks are part of my daily work. Think here about keywords like apache2, nginx, mysql, postgres, cron jobs, bash scripting, ubuntu, debian

Fortel | Rotterdam, Zuid-Holland
February 2017 - November 2018
Senior Lead Developer, DevOps

The company deals with an affiliate campaign's based product sales system. Tasks:


  • Maintain the "old" system (non OOP based PHP code).
  • Meantime planning and building an extended new sales system based on Laravel.


Laravel 5.6, AWS, HasOffers - Campaign setup, Automated DNS settings, Project Management, 3rd Party API integrations, Payment Provider - e.g., PayPal, LAMP, Nginx basics

Projectstage | Rotterdam, Zuid-Holland
Since February 2017

SaaS with currently one main project.

TweetEraser: Keep your time-line clean. TweetEraser is a simple web based tool, designed to help you filter and delete your bulk Tweets on an easy way. Just try TweetEraser. Load/Import your Tweets, even your whole archive, filter them and delete the results with almost one click. Use TweetEraser on almost all of your devices.

Clifden Employment Agency | Rotterdam, Zuid-Holland
April 2016 - January 2017
PHP Full Stack Developer

Maintain and further development for an extended document management system. Key tasks where LAMP system administration, deployments via Ansible, code reviews, documentation and of course some PHP development.


Additionally enhancement of an external tool written in JAVA which communicates with the Cygnet API to import, export and edit documents.


LAMP, Ansible, Java, Office 365 basics

CCGroup | Rotterdam, Zuid-Holland
October 2015 - March 2016
PHP Developer
  • Sparkholder project: Partly involved in front-end development of
  • Recruitment project: Functional design for a in-house recruitment tool which is planned to replace the current Otys tool. Workflow design, DB design, textual description of processes.
Whoopay (former Simpled N.V.) | Den Haag, Zuid-Holland
August 2014 - September 2015
PHP Back-end Developer

SEPA-API: Planning and building a communication API platform for handling XML based PAIN and CAMT files (Debtor/Creditor/Bank communication).


Transaction statistics, Invoicing, basic CRM functionalities, API connection to 3rd party tools like IBAN converter and payment provider.


SEPA, API creating & consuming, IBAN, Payment Provider - e.g., Mollie, LAMP

Grofas B.V. | Nieuwegein, Utrecht
February 2014 - June 2014
PHP Medior Developer

Grofas CRM: Maintenance and further development of that CRM, in house builded lead tracking system.


Grofas/Solvari: Starting development of a new lead generator system for Solvari. This will combine several individually systems, currently used by Solvari, into one code base.

Frenzy Media | Amsterdam, Noord-Holland
November 2013 - January 2014
PHP Backend Developer

Maintenance and further development of an in-house builded web application called Systion. The system itself contains functionalities as a PHP framework. It contains most necessary functionalities to use it for development of CMS, CRM and/or simple shop system.

Sharewire, | Den Haag, Zuid-Holland
November 2012 - May 2013
PHP Backend Developer

Project Salesboard: With the Salesboard Tablet, your sales team can give captivating presentations, browse the product catalog and interactively create a quote together with your clients. Combine your existing CRM, Tablets, HTML5 and the sales guys you already have, and give them a tablet with Salesboard to immediately improve their performance!


Main task is further development/maintenance of the Salesboard backend functionalities as well as the development of customer related add-ons.


LAMP, mysql, CRM

Datapas, | Haarlem, Noord-Holland
November 2011 - November 2012
PHP Developer/Consultant

Further development and maintenance of existing Business applications such as:


  • Aladin: Facility management system for room bookings and catering.
  • Capisci: Financial planning and control in education.



Freelancer/Owner | Remote
March 2010 - November 2011
Freelance PHP application development

Creating useful web application according customers business processes such as CMS, CM or payment provider implementations

MyLoc managed IT AG | Düsseldorf, Nordrhein-Westfalen
December 2005 - February 2010
PHP Developer

At MyLoc managed IT AG, a medium-sized ISP in Düsseldorf, as PHP developer I was responsible for designing and developing new tools for an in-house build CRM-System.


Other points of competency were to maintenance existing modules as well as advancement. Therefore web technologies such as PHP4/5, Pear, SOAP, HTML, CSS, JavaScript ( within the last few month sometimes AJAX ), XML, Smarty and relational databases (in particular MySQL) has been used.


For the last about 6 month another main task was to develop a storage system single applications written in Java.


PHP4/5, Pear, SOAP, jQuery, Smarty, mysql, Java

German Federal Railways | Hannover, Niedersachsen
August 1982 - May 1986
(IT) electronics technician

Practical education

Evening school IHK | Aachen, Nordrhein-Westfalen
August 1994 - April 1997
Master course for electrical engineering
Microrep GmbH | Aachen Germany
During 1996
Daily stuff
Creating & Consuming
Install & Configuration
Bash Scripting
very basic
Field of Business
Contribution at companies within the respective field of business. Next to freelancing this is part of my own business.
Internet Service Provider
Affiliate Marketing
Contribution at a company within the respective field of business.
Payment Service Provider
Setup & API
Project Management
Online Payment Service Provider
API integration of PayPal, Stripe, - SEPA/IBAN