Ralf Claassens

UNLOQ

Jan 2025 - Present

Freelance Ruby on Rails & React Developer Ralf re-joined UNLOQ in 2025. See below. Tilburg | unloq.org

FixFin

Feb 2024 - Present

Freelance Software Engineer As a software engineer Ralf works on the Fixfin web application to add features and API integrations. Remote | fixfin.nl

Koninklijke Boom Uitgevers

Feb 2024 - Dec 2024

Freelance Software Engineer As a software engineer Ralf works on multiple existing internal web application in order to support the Boom publisher business. This holds for example refactoring, framework upgrades and Kubernetes migration. Amsterdam (hybrid) | boom.nl

UNLOQ

Aug 2019 - Jan 2024

Freelance Ruby on Rails & React Developer As a lead developer (full stack) for UNLOQ Ralf manages to setup a complete coaching and communication platform with features like: Zoom integration, WebSockets, Single Sign-On, XLS exports, external API integrations, Progressive WebApp (including push notifications) and 2-factor authentication. This assignment at UNLOQ holds full stack software engineering as well as design for online coaching platforms. Technologies: Ruby on Rails, React, Cucumber / Selenium, RSpec, Unit testing, Continuous Integration, PostgreSQL, Docker, Tailwind CSS, StimulusJS. Tilburg | unloq.org

De Selectie

Oct 2022 - Jan 2023

Software developer Communications & consultancy company 'De Selectie' has asked Ralf as a backend software developer to develop a mobile app (Proof of Concept) called Scout. This mobile app collects the opinion from users to specific brands, companies and institutes. Ralf implemented an API, dashboard, hosting and worked together with a frontend developer to transfer the requirements into a working Proof of Concept. Utrecht | De Selectie

Frenetti (via Kabisa)

Oct 2020 - Dec 2020

Freelance Ruby on Rails Developer Frenetti is a Performance Management IT company with a new methodology to handle problems and challenges in hospitals and beyond. Our application is a disruptive approach about how to manage a hospital and beyond of nursing capital in nursing practice and other health care professionals. Technologies: Ruby on Rails, Cucumber / Capybara, RSpec, MySQL, Docker, Bootstrap, StimulusJS. Amsterdam | www.frenetti.com

Pondres

Aug 2020 - Sep 2020

Freelance GMC / Quadient Developer At Pondres Ralf developed workflow in GMC software: Quadient Inspire Designer. The purpose is mainly to bring customer data onto printed paper (such as letters) and shipped by Pondres. Also, direct mailing or online solutions are implemented using these workflows.
Technologies: Groovy, GMC Quadient Inspire Designer, Microsoft SQL Server. Tilburg | www.pondres.nl

ASML

Jul 2019 - Dec 2019

Freelance Ruby / Java / Groovy / DevOps At ASML returned as a allround developer on a number of internal services to support the huge ASML development department.
Technologies: Ruby, Java, Artifactory, Jenkins, Groovy, BDD, TDD, DevOps. Veldhoven | www.asml.com

De Bonth van Hulten (Koninklijke VolkerWessels)

Jan 2019 - Feb 2020

Freelance Software Developer At De Bonth van Hulten Ralf's assignment is to convert a complex Excel calculation for construction costs into a website. Aspects like: UI/UX design, database design, admin panels, DevOps, security, frontend and backend development.
Technologies: Ruby on Rails, PostgreSQL, Heroku, Microsoft Azure. Nieuwkuijk | www.debonthvanhulten.nl

Recharge B.V.

Mar 2017 - Jun 2019

Freelance Ruby on Rails Developer At Recharge.com (formerly known as Creative Group) Ralf works as a Ruby on Rails developer on a number of high traffic ecommerce platforms, such as www.recharge.com.
Technologies: AWS, Docker, RabbitMQ, Graylog, Spree, Redis, MySQL. Amsterdam / Nijmegen | company.recharge.com

Philips Lighting

Oct 2017 - Nov 2017

Freelance Ruby auditor and trainer Within the Philips Lighting department, Ralf is consulted as a Ruby expert for software audit and trainings. The test automation of the Philips Hue software is done through Ruby and Cucumber. This assignment is done via Eurofins Digital Testing. Eindhoven | www.lighting.philips.nl

Philips (via TMC)

Feb 2016 - Mar 2017

Full-stack Web Developer At Philips Connected Digital Platforms & Propositions Ralf has been working as a full-stack web developer using Ruby on Rails, REST, AngularJS and ReactJS. Also, Ralf played an important role as a DevOps consultant, because he implemented the integration between Team Foundation Server and Jenkins. Eindhoven | https://www.innovationservices.philips.com

ASML (via CGI)

Jan 2014 - Jan 2016

Software Configuration Management (SCM) Ruby / Java developer As a software developer and Ruby trainer in the IT4E / SEI department of ASML, Ralf developed a bridge between IBM ClearCase and Atlassian Bitbucket (Git) and Artifactory. Also, Ralf provided multiple Ruby training courses for both CGI and ASML colleagues. Used technologies: Git, Atlassian Bitbucket, Artifactory, TDD / BDD, Gradle, Continuous Integration - Jenkins, Ruby, Cucumber, Selenium. Veldhoven | https://www.asml.com

Freshheads

Dec 2009 - Nov 2013

Web Developer & Scrum master During his career at Freshheads BV Ralf has been working on several projects such as Werkspot, Arbo Catalogus, Floris van Bommel, Postcode API and Kadaster Toolbox API. Most of these projects were rebuilds or newly build. Also, some projects had to be refactored or improved.

For example, Werkspot.nl is a high traffic and well-known dutch platform which consists of a REST API and a website part. Ralf’s job was to re-build it with 4 other developers. Technical challenges such as a HTTP caching server (Varnish), multi-language and performance optimisation were important aspects. Tilburg | https://www.freshheads.com

Portbase (via Sogeti)

Apr 2007 - Sep 2009

Java Software Engineer & Architect Portbase is company which consists of 70 employees. It develops the so-called Port Community System for the ports of Rotterdam and Amsterdam. This enormous Java software application connects several parties in the port, such as terminals, customs, logistics, etc. The application is built within a OC4J application container / server and uses Struts and EclipseLink as ORM. Pernis | https://www.portbase.com

Cendris (via Sogeti)

Jan 2006 - Mar 2007

PHP Software Engineer Cendris is the leading dutch company for consumer and business data, telemarketing and inbound callcenters and printing of transaction and direct mail. For more than 1 year Ralf developed several software applications in his role as PHP software engineer & technical designer. Technical aspects such as object oriented PHP, MySQL, AJAX, HTML and CSS were applied by Ralf on a daily basis. Voorburg | Cendris (voorheen onderdeel van PostNL)

Tilburg University

2000 - 2005

Communication & Information Science, Language & Artificial Intelligence Tilburg

Ohio University

2005

Ohio University Without Boundaries - Sogeti (Netherlands) Program, business course on high performance teaming Athens, Ohio, United States of America