Dennis Siemensma Email and Phone Number

My new job after few months of traveling abroad. I changed my scene from (web) hosting to app development, although I still develop the backends.Lots of fun stuff so far. Many inspiring colleagues with tons of knowledge and insights. Great atmosphere.Technical skills:- Back to learning modern PHP with Symfony.- Designing and creating API documentation using OpenAPI and ReDoc.- Maintaining Postman collections and applying monitors using them.- Behavior tests with Behat.- Specification tests with PHPSpec.- Hexagon architecture for backend.- Logging with Elastic, using Kibana for visualization, applying watchers for monitoring.- Reworked usage of Behat for a better, improved and faster automated testing experience.- Basic architecture for secure data transmission (beyond TLS).Worked on a diverse set of projects, helping our customers in providing what they need for their business.

Dutch Smart Meter protocol (DSMR 4+) reader. Open source project built with Python 3 / Django for Raspberry Pi.Allows you to capture P1-data logged by your smart meter at home. Support both electricity and gas (extra device) readings. Started off as a personal project just for myself, but outgrew this scope due to many enthusiasts and happy users.Targets for originally starting this project were:- Python 3.x.- Multi language (PO translations).- Multi database (could be hard even while using an ORM).- Latest Django.- Writing documentation and translations.- Contributing software for others.- Raspberry Pi limitations.Many other things came along the road:- Managing an open source project.- MQTT.- External API's.- Internal API.- Versioning and managing releases.- Generic IT support (yeah I know...).

Used the opportunity to travel around Asia for a few months, after nine years of employment, since I was between jobs anyway.

First full time job as a developer (PHP / Python / Django / MySQL / PostgreSQL).General skill set:- Mainly using PHP, Python & MySQL, but also PostgreSQL & (a little) Perl.- Utilizing frameworks, such as Django (Python) and supporting utilities, such as Smarty (PHP) and jQuery.- Utilizing MySQL-replication.- Basic Apache & Nginx deployment. Combined with Supervisor and Gunicorn.- Development with virtual machines by using VirtualBox, Vagrant & Ansible.- Bug tracking using Jira, combined with Agile/Scrum for developing in sprints.Some projects I'm proud of:- Administrative migration of thousands of Starthosting customers to Yourhosting (2017).- Replaced our internal search engine by Elastic Search (2016).- ERP hosting server log searching tool, using Falcon (2015).- Automation of mass migration of hosting accounts between hosting servers (2014).- Helped with integration of Europe's SEPA (2014).- Integration with bank statement imports and the (almost fully) automated resolution of bank transactions (2012).- Automation of hosting account data traffic limit monitoring and flow (2009).- Integration with third party payment gateways, such as Adyen (2010, 2013).Other stuff:- Indexing data and its usage for GDPR (2018).- Versioning control, switched from using Subversion (SVN) to Mercurial (HG). Recently switched to GIT as well (2017).- Basic unit testing using Jenkins (linked with Django).- Switched from using Windows to Linux (Ubuntu) at home, as it makes my life a lot easier ;-)- Got myself quite familiar with Linux on servers. I will not call myself an expert, but I certainly know how to handle and maintain a server (Debian/Ubuntu based) using the command line.- Back-end programming for (long) running jobs and scheduling (cronjobs).- Linking systems together using JSON/SOAP API's and integrating token authentication.

Part time job when I still was in college. I stayed here for quite some years after my graduation (along side my main job at Yourholding), to learn other things besides programming and keep myself fit.Working here meant doing a lot of different, non-IT-related things, such as: - Party rental services.- Driving delivery truck.- Building tents.- Cleaning stuff.- Hospitality & party support.

Worked here during college (Windesheim) as intern for my graduation assignment.- Basic programming using PHP & MySQL. - Introduced a dedicated development and staging environment.- Introduced version control using Subversion (SVN). - Improved workflow for developers (written lot of manuals/documentation).

Part time job as webdeveloper when I was in college. Most of the time I worked here as an intern, except during the holiday season.- Learned using versioning control.- Learned a lot about PHP & XHR.- Supported colleagues building applications for customers.

Kitchen support... ;-)