Jef Vlamings, Developer in Hoogstraten, Belgium
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Jef Vlamings

Verified Expert  in Engineering

Software Developer

Hoogstraten, Belgium
Toptal Member Since
August 18, 2022

Jef is a full-stack engineer with more than 10 years of professional experience in web development. He's worked on 50+ projects and solved complex business problems in industries including real estate, media, sports, eCommerce, food, and retail. Jef has consistently saved costs while increasing profits. He's ready for an opportunity to use his skills to grow your revenue exponentially.


Cipal Schaubroeck
Ruby, Ruby on Rails (RoR), Jenkins, Docker, Nexus, GitLab, React, Redux...
Web Consulting, SEO Marketing, Paid Advertising, DevOps, APM, Ansible...
DPG Media
Ruby, Ruby on Rails 4, Vagrant, Vim Text Editor, RSpec, Cucumber, HTML...




Preferred Environment

MacOS, Vim Text Editor, IntelliJ IDEA, Photoshop CC, Figma, Sketch, Oh My Zsh, Slack, Chrome, Sublime Text

The most amazing...

...thing I've developed is a real-time tracking platform for a taxi company. GPS data is collected and streamed via WebSockets on an interactive map.

Work Experience

Senior Full-stack Engineer

2022 - PRESENT
Cipal Schaubroeck
  • Switched an existing application to a different stack. One of the tasks involved a migration from PostgreSQL to MySQL.
  • Changed deployment flow from Capistrano to Docker deployments using Jenkins.
  • Integrated local print services to print documents in batches.
Technologies: Ruby, Ruby on Rails (RoR), Jenkins, Docker, Nexus, GitLab, React, Redux, React Redux Form, Swagger, Postman

Founder & CEO

2017 - PRESENT
  • Digitally transformed local SMEs and boosted their total revenue.
  • Set up, configured, and managed a fleet of servers tailored to the customers' projects.
  • Developed and open-sourced an in-house CMS that is actively used in 20+ live projects.
Technologies: Web Consulting, SEO Marketing, Paid Advertising, DevOps, APM, Ansible, Terraform, Docker, GitHub, Git, Slack, Figma, Sketch, Photoshop CC, Illustrator CC, Ruby, Ruby on Rails (RoR), REST, Ruby on Rails API, Vue, Ruby Gems, Postmark, Sidekiq, HTML, PHP, JavaScript, Technical Hiring, Code Review, Source Code Review, Task Analysis, Interviewing, CSS

Senior Ruby on Rails Engineer (Freelance)

2019 - 2019
DPG Media
  • Performed maintenance tasks on a tool used by all hosts on several national radio channels, e.g., QMusic, JoeFM, and Willy.
  • Modernized an existing Ruby on Rails codebase and increased test coverage.
  • Developed API endpoints to be consumed by native mobile apps.
  • Integrated a shared radio player widget on multiple broadcasting front ends.
  • Architected small interactive games to entertain a large audience.
Technologies: Ruby, Ruby on Rails 4, Vagrant, Vim Text Editor, RSpec, Cucumber, HTML, JavaScript, Code Review, Source Code Review, Task Analysis, CSS

Technical Director

2012 - 2019
Omakase BV
  • Architected a community platform with social features like a web feed, discussion board, live chat, and job board.
  • Set up CI/CD pipelines and monitoring. Managed infrastructure and tuned a bare-metal server configuration to maximize performance.
  • Managed a team consisting of designers, front- and back-end developers, and freelancers.
Technologies: Ruby on Rails (RoR), XML, REST, JSON, Elasticsearch, APM, Capistrano, CI/CD Pipelines, Amazon S3 (AWS S3), Amazon CloudFront CDN, DevOps, Technical Leadership, Sass, Redis, SSH, HTML, JavaScript, Technical Hiring, Code Review, Source Code Review, Task Analysis, Interviewing, CSS

Junior Full-stack Web Developer

2012 - 2015
  • Started with no professional background or education and quickly took the position as the lead front-end developer.
  • Build an asset management tool for a large supplier of dentistry products.
  • Launched audience engagement games on eCommerce websites with more than 10,000 entries.
Technologies: PHP, CodeIgniter, WordPress, Less, JavaScript, BrowserStack, Litmus, Bootstrap, Backbone.js, jQuery, Craft CMS, Symphony, FTP, Subversion (SVN), CodeKit, Coda, NetBeans, HTML, Source Code Review, CSS

Community Platform for Field Hockey
Built and launched the leading hockey network, a corporate venture with the world's largest sports retailer. I architected the platform and led a team of developers. The application was built as an SSR application with a fully featured API that served native mobile apps.

Etixx Sports eCommerce Platform
A Ruby on Rails-based web application that sells sports nutrition online and through local pharmacies.

My role was to upgrade an existing web shop to become a platform with complex integrations including stock management, warehousing, fulfillment, third-party loyalty programs, and online payment providers.

My contributions included:
• Set up support for multiple locales and languages
• Integrated third-party webhooks and APIs
• Refactored the front end and implemented a reusable component library
• Set up a custom-made CMS for eCommerce management
• Set up notifications via websockets
2011 - 2012

Master's Degree in Education

Universiteit Antwerpen - Antwerpen, Belgium

2009 - 2011

Master's Degree in Biology

Universiteit Antwerpen - Antwerpen, Belgium


jQuery, Highcharts, ImageMagick, Sidekiq, Slack API, Google Maps API, Google Analytics API, Backbone.js, Ruby on Rails API, Vue, SendGrid API, React, React Redux Form


IntelliJ IDEA, Sublime Text, GIS, Vagrant, Vim Text Editor, RSpec, Cucumber, Redactor, Mailchimp, Capistrano, Amazon CloudFront CDN, Photoshop CC, Figma, Sketch, Oh My Zsh, Slack, BrowserStack, Litmus, Subversion (SVN), Coda, Ansible, Terraform, GitHub, Git, Illustrator CC, Solr, Jenkins, GitLab, Postman


Ruby on Rails 5, Ruby on Rails (RoR), Ruby on Rails 4, Bootstrap, OAuth 2, Dropzone.js, Chrome, CodeIgniter, Redux, Swagger


Ruby, HTML, JavaScript, CSS, PHP, CoffeeScript, Sass, Less, XML, Unicorn


Redis, Elasticsearch, Amazon S3 (AWS S3), JSON


Load Testing, REST, DevOps


DigitalOcean, New Relic, Phusion Passenger, MacOS, WordPress, Craft CMS, NetBeans, Docker, Nexus


Technical Hiring, Code Review, Source Code Review, Task Analysis, Interviewing, Statistics, Physics, LiDAR, Innovation Labs, University Teaching, Coaching, Learnability, Presentations, Ruby Gems, CAPTCHA, Puma, Foreman, Symphony, FTP, CodeKit, APM, CI/CD Pipelines, Technical Leadership, SSH, Web Consulting, SEO Marketing, Paid Advertising, Postmark, SOAP

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