---
title: "About us"
description: "Experience easy site speed optimization with RUMvision: A solution crafted by web performance experts for real-time Core Web Vitals insights"
canonical: "https://www.rumvision.com/about-us/"
---

Breadcrumbs: [Home](https://www.rumvision.com/?format=md) > [Resources](https://www.rumvision.com/resources/?format=md) > About us

 ![frame-1000009622.svg](https://www.rumvision.com/file/upload/img/frame-1000009622.svg)

# We are here  
 for real user monitoring

## Our team

- ![Karlijn Löwik](https://www.rumvision.com/file/upload/img/team/thumb.karlijn-rumvision-2.png)
    
    ### Karlijn Löwik 
    
      CEO
    
    I'm on a mission to make web performance a business priority for eCommerce companies. As CEO with extensive IT experience, you might see me with onboarding, finances and legal matters. I speak internationally on web performance, advocate for RUM, and champion women in tech.
    
    I also serve as Co-chair for the RUM W3C Group and boardmember of Mage-OS NL. And yes, I coined "Sitespeed User Experience (SUX)" – because good SUX sells! 😉
    
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    - [Mail to Karlijn Löwik{glyph:email}](# "karlijn op rumvision punt com")
    - [linkedin Karlijn Löwik{glyph:linkedin}](https://www.linkedin.com/in/karlijn-lowik/)
    - [bluesky Karlijn Löwik{glyph:bluesky}](https://bsky.app/profile/karlijnlowik.bsky.social)
- ![Roderik Derksen](https://www.rumvision.com/file/upload/img/team/thumb.roderik-rumvision.png)
    
    ### Roderik Derksen 
    
      Commercial director
    
    As the commercial director, you will frequently hear from me during the onboarding process. I have over 15 years of experience as an independent marketer with SEO, SEA, and marketing strategies. My background is in business development.
    
    I'm also in charge of RUMvision partnerships. Please contact me if you are a development agency, marketing agency or a site speed consultant.
    
    ---
    
    
    - [Mail to Roderik Derksen{glyph:email}](# "roderik op rumvision punt com")
    - [linkedin Roderik Derksen{glyph:linkedin}](https://www.linkedin.com/in/roderikderksen/)
- ![Erwin Hofman](https://www.rumvision.com/file/upload/img/team/thumb.erwin-rumvision.png)
    
    ### Erwin Hofman 
    
      CTO & Pagespeed expert, GDE
    
    As CTO, I help solve technical problems. If you're having trouble with site speed, this can be in a consulting role. I am also in charge of fixing bugs and coming up with new features.
    
    For the past 18 years I've been a full-stack developer. The last 5 years I've also been a page speed consultant for e-commerce. Insights gathered in both roles have resulted in RUMvision.
    
    ---
    
    
    - [Mail to Erwin Hofman{glyph:email}](# "erwin op rumvision punt com")
    - [linkedin Erwin Hofman{glyph:linkedin}](https://www.linkedin.com/in/erwinhofman/)
    - [bluesky Erwin Hofman{glyph:bluesky}](https://bsky.app/profile/erwinhofman.bsky.social)
    - [x-twitter Erwin Hofman{glyph:x-twitter}](https://twitter.com/blue2blond)
- ![Jordy de Blecourt](https://www.rumvision.com/file/upload/img/team/thumb.jordy-rumvision.png)
    
    ### Jordy de Blecourt 
    
      Customer success & Google Developer Expert
    
    When you first start using RUMvision, I am usually your first point of contact. I assist you with onboarding and questions. I'm also very active with writing blogs, marketing and sharing knowledge about page speed and consultancy.
    
    I enjoy engaging with people who are just starting out in performance, so feel free to reach out!
    
    ---
    
    
    - [Mail to Jordy de Blecourt{glyph:email}](# "jordy op rumvision punt com")
    - [linkedin Jordy de Blecourt{glyph:linkedin}](https://www.linkedin.com/in/jordy-s/)
- ![Johan Jorritsma](https://www.rumvision.com/file/upload/img/team/thumb.johan-jorritsma.png)
    
    ### Johan Jorritsma 
    
      Developer
    
    As a front-end developer, I like making websites that load quickly, are easy to use, and don't have to compromise on design. I code in CSS, HTML, and JS, and I make the templates RUMvision needs to tell you our story.
    
    I mostly work as a front-end developer for Blue 2 Blond ( Erwin and Karlijns webagency).
    
    ---
    
    
    - [Mail to Johan Jorritsma{glyph:email}](# "johan op blue2blond punt nl")
    - [linkedin Johan Jorritsma{glyph:linkedin}](https://www.linkedin.com/in/johan-jorritsma/)
- ![Robert Silos](https://www.rumvision.com/file/upload/img/team/thumb.robert-rumvision.png)
    
    ### Robert Silos 
    
      Developer
    
    I'm a full-stack developer, and help with API connections, integrations, coding and front-end challenges that also require some backend knowledge.
    
    ---
    
    
    - [Mail to Robert Silos{glyph:email}](# "robert op blue2blond punt nl")
    - [linkedin Robert Silos{glyph:linkedin}](https://www.linkedin.com/in/robert-silos/)