Lesley-Nicholas Vassallo


about me

Hey! I’m Lesley-Nicholas Vassallo. I’m a data nerd who’s passionate about all things marketing and customer insights. I currently work at Dunnes Stores in Dublin, Ireland as an Ecommerce Analyst.

Throughout my career, I’ve worked on building, analysing and optimising digital marketing campaigns, setting up web analytics and advertising site tags, and building dashboards.



  • How I built a Lightweight Web Analytics Tracker

    I have used many different trackers in my career and always thought, how does it work under the hood? What would it take to build a simple web analytics tracker myself? Using server-side Google Tag Manager, we can now send data directly to BigQuery. This is a great solution and makes sense for most businesses…

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  • New Zealand Pie Awards Dashboard

    Every year, the New Zealand Pie Awards crown the country’s best pies. Bakers from all New Zealand over compete for gold, silver, and bronze across a range of categories, from the classic steak and cheese to vegan options and sweet treats. It’s a fun part of Kiwi culture which Kiwis take very seriously. Some people…

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  • Maximizing Data Capture: Overcoming Cookie Consent Timing Issues in Google Tag Manager

    Context When consent mode is enabled in Google Tag Manager, it often happens that some events are pushed to the dataLayer before the user even has a chance to accept cookies. Events commonly impacted by such scenarios are ‘view_item‘ and ‘view_item_list‘ events. Even if they accept, sometimes it’s tricky, or not possible to trigger the…

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