Júnior Siri, Marketing Expert in Limerick, Ireland
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Júnior Siri

Bio

Junior is an operator–strategist specializing in driving profitable scale across Google and Meta, building full-funnel campaigns. His notable achievements include increasing profit by 181% quarter over quarter through expanding successful campaigns into new markets. Achieving a 184% ROAS by aligning bidding models with high-intent conversions, lowering CAC by 32% via optimized budget allocation and placement strategies, and elevating SQLs by 57% through prioritizing higher-value funnel actions.

Project Highlights

Data-driven Campaign to Reclaim Samsung's Market Share
Drove the sale of 6+ million smartphones, playing a key role in Samsung's market share recovery through data-driven strategies. The campaign's success led Samsung to quadruple the budget and earned me a finalist spot in Cannes Young Lions Brazil.
Transformation of Lead Generation Into Sales | A SaaS Story
Increased ROAS by 184%, sales-qualified leads by 57%, and overall leads by 45% by aligning Google's algorithm with the company's highest-value business objectives.
Market & Time Optimization to Expand Advertising Arbitrage Profit
Boosted profits by 181% QoQ and achieved a 16% revenue-per-click (RPC) growth by expanding campaigns into high-potential markets and optimizing for profitable time slots.

Expertise

  • Data Storytelling
  • Data Strategy
  • Data-driven Decision-making
  • Digital Marketing Strategy
  • Facebook Ads
  • Google Ads
  • Paid Media
  • Performance Analysis

Work Experience

Performance Marketing Strategist

2023 - PRESENT
Toptal
  • Achieved 181%+ profit QoQ by expanding successful campaigns into new markets.
  • Increased ROAS by 184% by aligning bidding models with high-intent conversions.
  • Reduced CAC by 32% through budget reallocation and placement optimization.
  • Boosted SQLs by 57% by prioritizing higher-value funnel actions.
  • Led multi-market Google/Meta campaigns tied to revenue.
  • Designed and maintained measurement and reporting systems using Looker dashboards and executive PowerPoint reports, improving decision speed and clarity.

Paid Media Specialist

2022 - 2022
Wolfgang Digital
  • Managed Google and Bing Ads for retail (Very), IT security (Trend Micro), and furniture eCommerce (Castle Davitt).
  • Architected account structures to capture incremental demand and boost sales.
  • Built negative-keyword lists and iterated creatives to improve relevance, CTR, and ROAS.
  • Developed prospecting proposals, leveraging performance cases and forecasts to support client acquisition.

Data Strategy Lead

2020 - 2022
Southern
  • Led multi-platform paid (Meta, Google, LinkedIn, Twitter, TikTok) for public sector (County Councils), education (University of Limerick), healthcare (UL Hospitals), Environmental (My Waste), and building supplies eCommerce (TJ O’Mahony).
  • Built a competitive benchmarking framework that guided budget allocation and messaging, lifting qualified leads and call volume.
  • Launched a visual data storytelling product, improving executive clarity and win rates.
  • Drove engagement and conversion gains via rapid creative/audience testing loops.

Data Strategy Instructor

2015 - 2022
Udemy
  • Educated over 6,000 students spanning 70 countries.
  • Became one of the top-rated instructors at Udemy Brazil with a 4.8 rating out of 5 from 644 students.
  • Received favorable instructor ratings—100% of students deemed me knowledgeable, and 98% found my explanations clear.

Senior Data Strategist

2016 - 2019
Leo Burnett (owned by Publicis Groupe)
  • Led data strategy for electronics (Samsung), entertainment (Disney - Marvel/Pixar), food and beverage (Heineken - Devassa/Schin and Ferrero - Kinder/Nutella), and automotive (FCA - Jeep/Fiat).
  • Was a finalist in Cannes Young Lions Brazil; contributed analytics that supported Samsung’s market share recovery.
  • Built a 5-person analytics team; created an influencer validation methodology.
  • Unified reporting and social listening into actionable narratives that accelerated decisions and helped teams.

Data Strategy Coordinator

2015 - 2016
Fbiz (owned by WPP)
  • Coordinated analytics and cross-platform campaigns (Google/Meta/Bing) for telecom (América Móvil — Claro, Net, Embratel).
  • Integrated paid, web, and email data into a unified executive report to streamline decision-making.
  • Improved brand-lift and intent metrics through creative and audience refinements.
  • Built a dedicated analytics squad for the clients.

Data Strategist

2014 - 2015
Publicis Sapient (owned by Publicis Groupe)
  • Delivered data-driven insights for electronics (Sony), healthcare (Johnson & Johnson - Johnson’s Baby), food (Ferrero - Nutella and Kraft - Philadelphia), and telecom (Telefónica - Vivo).
  • Merged performance reporting and social listening into clear recommendations that influenced media and creative optimizations.
  • Supported the team in client persuasion through data.

Junior Data Strategist

2013 - 2014
AD.Dialeto (acquired by Accenture)
  • Improved content engagement by 35% through actionable insights that helped optimize social media strategies.
  • Enhanced audience engagement by incorporating social listening insights into creative content strategies.
  • Redesigned major report formats to strengthen clarity and insights.

Social Media Strategist

2011 - 2013
Teaser Propaganda
  • Boosted overall social media engagement by 335% through an innovative content strategy that used the number of likes as a criterion to determine the size of a prize, resulting in increased interaction and participation.
  • Headed the Co-creative Website Project, establishing the agency as an industry benchmark.
  • Contributed to the establishment of the agency's inaugural social media department.
  • Enabled the agency to have the most Facebook followers in the local market in less than 48 hours.

Social Media Strategist

2009 - 2011
Mentes Digitais
  • Contributed to structuring the department and improving workflow efficiency.
  • Promoted from social media intern to social media strategist within three months.
  • Spearheaded innovative social media strategies, leading to increased engagement.

Project History

Data-driven Campaign to Reclaim Samsung's Market Share

https://www.youtube.com/watch?v=17gXdKpX_A4

Drove the sale of 6+ million smartphones, playing a key role in Samsung's market share recovery through data-driven strategies. The campaign's success led Samsung to quadruple the budget and earned me a finalist spot in Cannes Young Lions Brazil.

SITUATION
While at Leo Burnett, Samsung needed to recover market share lost to Motorola with an aggressive campaign, constrained by a $1 million budget.

CHALLENGE
I was tasked with creating a strategy to maximize the campaign’s impact and effectively target potential customers in Brazil’s extensive market.

SOLUTION
I utilized survey data indicating that Brazilians typically replace their phones every 18 months. By partnering with Facebook, we created a filter to identify users likely to purchase new phones based on their current models and ownership duration. This strategy enabled us to select 130 high-potential locations and concentrate our campaign efforts on six key areas.

Transformation of Lead Generation Into Sales | A SaaS Story

Increased ROAS by 184%, sales-qualified leads by 57%, and overall leads by 45% by aligning Google's algorithm with the company's highest-value business objectives.

SITUATION
A SaaS company ran paid search campaigns with a sales funnel that included high-volume “soft” goals such as PDF downloads of case studies and high-intent goals such as contact forms.

CHALLENGE
I was tasked with maximizing the volume of high-intent conversion actions, such as sales contact forms, without compromising overall lead volume or cost efficiency while still engaging audiences through softer actions.

SOLUTION
I assigned revenue values to each goal. Then, I shifted the campaign’s strategy from maximizing conversions to maximizing conversion value, allowing Google’s smart bidding algorithm to prioritize the most valuable actions. This approach effectively transformed lead-generation efforts into measurable sales outcomes.

Market & Time Optimization to Expand Advertising Arbitrage Profit

Boosted profits by 181% QoQ and achieved a 16% revenue-per-click (RPC) growth by expanding campaigns into high-potential markets and optimizing for profitable time slots.

SITUATION
I managed advertising arbitrage campaigns across 10 countries and five languages. Germany was my most profitable market due to its high click volume, strong conversion rates, and high RPC. In advertising arbitrage, the goal is to maximize profit by optimizing the difference between the cost of clicks and the revenue generated from them.

CHALLENGE
I needed to increase overall profitability in the German market but had reached a scaling limit. My task was to find a way to expand the top-performing campaigns while maintaining high profitability and minimizing low-performing periods in terms of RPC.

SOLUTION
To scale, I expanded the top-performing German campaigns to Austria and Switzerland, as both countries share the same language, allowing me to reuse the ad copy efficiently. I also analyzed the RPC fluctuations throughout the day and discovered that performance dropped significantly between 6:00 PM and midnight. I excluded these low-performing hours for the new campaigns, allowing me to achieve a higher RPC during profitable periods and raise bids to optimize performance further.

Education

2009 - 2012

Bachelor's Degree in Social Communication, Advertising, and Marketing

Unit - Universidade Tiradentes - Aracaju, Sergipe, Brazil

Certifications

SEPTEMBER 2024 - OCTOBER 2025

Google Ads Search Certification

Google Skillshop

OCTOBER 2023 - OCTOBER 2024

Google Ads Display Certification

Google Skillshop

MAY 2023 - PRESENT

Certificação Subido de Tráfego - Google Ads

Pedro Sobral

APRIL 2023 - PRESENT

Certificação Subido de Tráfego - Meta Ads

Pedro Sobral

JUNE 2020 - PRESENT

GDPR for Marketers

LinkedIn Learning

JUNE 2020 - PRESENT

Analyze Measurement Data to Extract Key Insights

Meta Blueprint

Skills

Core

Google Ads, Facebook Ads, Digital Marketing, Paid Advertising, Facebook Marketing, Instagram Marketing, Campaign Management, Search Engine Marketing (SEM), Social Media Marketing (SMM), Pay-per-Click (PPC), Digital Marketing Strategy, Social Media Strategy, Audience Targeting, Funnel Marketing, Lead Generation, Display Advertising, Social Media Analytics, Influencer Marketing, TikTok Marketing, Brand Strategy, Marketing Strategy, Social Media, Google Tag Manager, LinkedIn Ads, Content, Growth Hacking, Funnel Optimization, A/B Testing, Social Media Advertising, Search Engine Optimization (SEO)

Platforms & Tools

Looker Studio, Google Analytics, Bing Ads, Instagram Ads

Business Models

SaaS

Other

Media Planning, Strategy, Presentations, Data Visualization, Digital Strategy, Strategic Planning, Reporting, Data Analysis, Microsoft PowerPoint, Paid Media, Data-driven Marketing, Microsoft Excel, Visual Storytelling, Storytelling, Data Strategy, Research, Social Listening, Campaign Planning, Conversion, Campaign Optimization, Data-driven Decision-making, Paid Search, Performance Analysis, Profitability Optimization, Campaign Scaling, Multilingual Campaign, Data Storytelling, Search Arbitrage, Market Opportunity Analysis, Meta Ads, Customer Acquisition, Google Sheets, Team Management, Complex Problem Solving, Creativity, Competitive Analysis, ChatGPT, Advertising, Campaigns, Web Analytics, Market Research, Digital Media, Critical Thinking, Analytics, Optimization, Partnerships, Collaboration, Market Expansion, eCommerce, Client Management, General Data Protection Regulation (GDPR), Growth Marketing, Growth Strategy, Pixel, Brand Awareness, Brand Awareness Campaigns, Data Analytics, Agency, Digital Agencies, Online Sales

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