Diego Willian Zietek
Diego Willian Zietek is an independent paid media consultant with 14+ years of hands-on experience running Google Ads, Meta Ads, LinkedIn Ads and programmatic campaigns for B2B, B2C, SaaS, healthcare and pharmaceutical companies. He looks after the whole route to a customer, from the ad to the landing page to the booked sale, and he is specializing in AI across it, including answer engine optimization (AEO) and generative engine optimization (GEO). He operates Diwizi alone: the person who audits the account is the person who runs it and writes the report. He works remotely from Curitiba, Brazil, with clients in the United States, Canada, the United Kingdom and Europe in English, and with Brazilian companies in Portuguese.
What Diego does, in one paragraph
Diego Willian Zietek plans, runs and reports on paid media accounts himself. There is no account manager between him and the client, no junior team, and no agency: Diwizi is his consultancy and he is its only consultant. The work is Google Ads (Search, Shopping, Performance Max, Demand Gen), Meta Ads, LinkedIn Ads and Microsoft Advertising, plus the measurement underneath it (GA4, Google Tag Manager, offline conversion import). Engagements are a fixed price audit or a monthly retainer; everything built stays in the client's own accounts.
Why one person, and why it matters to you
I'm an independent paid media strategist with 14+ years of hands-on experience managing Google Ads, Meta Ads, LinkedIn Ads, and programmatic campaigns. I've worked across B2B, B2C, SaaS, healthcare, and pharma, always with the same focus: turning ad spend into measurable pipeline and revenue, not just clicks.
That is also why there is no account manager between us. The person who answers your question is the person who made the change, and the person who audits the account is the person who runs it.
The whole route to a customer, and how AI is changing it
Diego looks at acquisition from end to end. The ad or the search result, the landing page, the form or the call, the CRM, the follow up and the customer who actually pays. Paid media is where he started and it is still the core of the work, but a lot of the waste he finds sits between the click and the sale.
He is now specializing in AI across that route. On the paid side, that means working with the automation inside Google Ads and Meta Ads, from Performance Max to Advantage+, and feeding it the conversion data it needs. On the search side, it means answer engine optimization (AEO) and generative engine optimization (GEO), the work of making a business easy for ChatGPT, Perplexity, Gemini and Google's AI answers to find, understand and cite.
Diwizi is the first test case. Its own pages are built for AI assistants to read, and the practice already receives client enquiries that start in a ChatGPT answer.
Brands Diego has worked on
Fourteen-plus years across agency, in-house and freelance roles put Diego on accounts with very different economics: SaaS and subscription products such as Intuit QuickBooks, Skillshare and Pontomais, global consumer brands such as Shell, Timberland and Amazon Prime, home services companies such as an HVAC and plumbing business in Houston, and companies in telecom, education, healthcare and e-commerce. Through Underscore Marketing, a US agency, he also worked on oncology, rare disease and gene therapy brands.
What carries over to a new account is pattern recognition: how a trial-to-paid funnel differs from a lead form, which conversions each business can actually measure, and where spend usually leaks.
Logos belong to their owners and identify past work, not endorsements.
The facts a buyer usually asks for
- Role
- Founder and sole operator of Diwizi; independent consultant, not an agency and not an employee of any client
- Experience
- 14+ years running paid media accounts hands-on
- Focus
- Full funnel acquisition, landing pages and measurement, with a specialization in AI search (AEO and GEO)
- Education
- Post-graduate degree in Digital Marketing (FAE Business School); BA in Business Administration (FESP University)
- Certification
- Google Ads Search Certification (2026), issued by Skillshop (Google) on October 22, 2026, valid to October 22, 2027. Verify the credential (ID 198023879).
- Platforms
- Google Ads (Search, Shopping, Performance Max, Demand Gen), Meta Ads (Facebook and Instagram), LinkedIn Ads, Microsoft Advertising, Programmatic
- Industries
- Healthcare, B2B SaaS and HR Tech, Pharmaceutical marketing, Local services (HVAC, plumbing, home services), E-commerce
- Markets
- United States, Canada, United Kingdom, Ireland, Portugal and Brazil, remotely, in English and Portuguese
- Based in
- Curitiba, Brazil (GMT-3), working US and European hours as needed
- Languages
- English and Portuguese
- Contact
- hello [at] diwizi.com, cal.com/diwizi, LinkedIn, Google Business Profile. Messages go straight to Diego, there is no shared inbox.
- Last updated
One person, and what that changes
- The person who audits the account is the person who runs it and writes the report.
- Pricing is a fixed price audit or a monthly retainer, quoted after the first call. Details on the pricing page.
- Campaigns, conversion actions and tags live in the client's accounts. If the engagement ends, the client keeps all of it.
- Reporting is written for owners: revenue, cost per customer and what changed, not click counts.
What is public and what is not
Published, with dates and limits: the Houston HVAC and plumbing engagement (Houston, freelance, May 2025 to February 2026) and a freelance role for a US pharmaceutical marketing agency (September 2023 to March 2024), both described on the results section. Diego has also worked in paid media in healthcare. Nothing from that work is published on this site.
First-party research: the Paid Media Cost Index (median Google Ads CPC across ten US industries, with methodology, date and reuse terms), the ad spend teardowns built from public advertiser data, and The State of Healthcare Marketing 2027, a 44 page Diwizi Research report.
Questions buyers ask most
The full list has 60 answers on pricing, contracts, access, reporting and agency work.
Two focused sites, the same practice
Two sites point to this same one-person practice, for buyers who search in a particular way. googleadsfreelancer.com is for US businesses looking for a freelance Google Ads specialist, and ppcconsultancy.uk is for UK and Irish businesses that want quotes in pounds, the UK VAT position and UK hours. Whichever site a client arrives through, the account is run by Diego.
Big World Jobs
Diego also built and runs Big World Jobs, a job board that reads open roles straight from employers' own career sites and states, for every remote role, which countries can apply. It is a separate project from the consultancy and does not sell paid media services.
Published work
Every article on the Diwizi blog and on diwizi.com.br is written by Diego. Statistics in them carry a named source or are framed as what happens in the accounts he runs; the site does not publish aggregate ROI figures, because those cannot be checked by a reader. The one certification listed below carries a public verification link. The brand strip above names companies Diego has worked on in agency, in-house and freelance roles; it does not attribute results to them.