B2B Growth for Scaleups. leahtharin.com

B2B Product-led Growth & Sales

Honest, sometimes funny, battle-tested cross-functional Growth & Product insights, board member, growth advisor.

I love working in the operational details with my clients and am an Innovation Product & Growth Nerd.

I run PLG and PLS cohorts at Maven:
https://maven.com/leah-tharin/productledgrowth

and wrote Leah's Product-led Growth Guide:
https://www.leahtharin.com/p/the-product-led-growth-guide

www.leahtharin.com -> (Blog, Podcast, Guides, Rates to work with me. contact)

Leah Tharin

I'm not saying I called it, but I totally called it.

https://lnkd.in/e2UUdZHY

Totally deserved. Rock on Anthropic

Open article: Anthropic turns the tables on OpenAI in critical revenue category by axios.com

A line chart that shows monthly shares of first-time enterprise customers choosing OpenAI or Anthropic from December 2025 to February 2026. OpenAI fell from 59.7% to 26.7%, while Anthropic rose from 40.3% to 73.3%.

Anthropic turns the tables on OpenAI in critical revenue category

There's a 90% chance that you're browsing linkedin right now because Claude is down. #iseeyou

There's a 10% chance that one of your colleagues is having a heart attack right now because of it

Yes, I'm still alive. In other news, I almost subscribed to Whisper today. Almost. My Obsidian vault says I went down from 45 Subscriptions for business-related services to 12 in the past month.

Will write about it soon and probably a bit more when I'm done being completely exhausted from working, AI, context managing (keeping 1'000 md files under control, probably the most elegant thing i ever built in my life), and sleeping too little.

Anthropic, you guys are rocking it.

Also, I created a knitting/stitching app for Taylor Swift fans with Claude, and the people who use it are loving it. Don't ask, still proud.

Ciao.

Using Lovable for the first time for fun, after playing adult in Claude code for 3 weeks straight.

Can you tell that I'm a prompt engineer?

Pretty good stuff there Elena Verna, you should try it out too. Claude is commenting my efforts with:

"Oh Leah, Lovable doesn't know you like I do, I know what drama really means for you."

Immediate promotion.

(Lovable is cool though, can see how it's good with a context machine behind it, that feeds great plans)

I caught the same wrong fact in three different reports last week.

Numbers were correct. Charts were clean. Conclusions were garbage.
The date range included bot traffic. Nobody flagged it. The knowledge that those weeks were polluted? Lived in my head.

My AI caught it. Because I taught it that fact three weeks ago in one line of text.

FFS, we're spending billions optimizing retrieval. Bigger context windows. Better RAG. Faster inference.

Nobody is asking whether the fact being retrieved is actually true.
Retrieval correctness is not factual correctness.

The fix isn't a better model. It's a text file where you write down what you already know. 30 seconds. One correction. Every future output gets better.
I wrote about how I actually do this, why I think about reports like code commits, and the Sisyphus problem of building context.

👉 https://lnkd.in/egtVj5Ku

Founder @sendxmail & @zopply | Board Member @APPM | Professor @Univ Lusofona, @Flag & @ETIC - Email Marketing, Marketing Automation, Brand Online Presence

I'm passionate about Marketing. Especially, I love to help businesses apply Marketing strategies and best practices.

All of the projects and startups I've created along the time were dedicated to helping businesses get a better ROI.

With a Communication Design background and as a former Creative Director, I consider myself a very creative person.

I grab opportunities that inspire me. When I received a proposition to start on a new advertising channel that was venturing in Portugal, it was clear to me that I wasn't going to miss it. Since then, I was supported by mentors in my life that guided me and provided the tools to succeed, mostly based on self-taught and deep investigative learning.

Later on, I've added a more analytical approach and management focus when I helped start one of the major Iberian and Latin American groups in Digital Marketing (today is called MediaResponse Group). I was not afraid of getting my hands on every business aspect and own it until I was really good at it. That's why it was natural to me to start leading teams in this area since I had worked on almost every position they were handling. Obviously, I was always learning at the same time and keeping a strong ambition to do more of myself.

Leave my comfort zone and challenge myself. - that's my motto. And that's the reason I left the company. I helped to create and rechallenge myself to start new businesses. In the spirit of sharing my experience with others and improve this area I love so much, I've accepted the invitation to join APPM - the Portuguese Marketing Professionals Association as a Board Member with which I collaborate since 2013.

Rui Nunes

Everyone's panicking about third-party cookies dying.

Meanwhile, email marketers have been sitting on the most powerful data asset in digital marketing for decades... and still don't know what to do with it. 🤦‍♂️



First-party data. 
The data your audience hands you directly, voluntarily, every time they interact with your emails. 

Opens. 
Clicks. 
What they clicked. 
What they ignored. 
What they bought. 
What they abandoned. 
When they engage. 
How often.

Instead of borrowing data from a platform that can change its algorithm overnight, this is YOURS. Collected with consent, stored in your platform, ready to use.

And yet 56% of people unsubscribe because the content stopped being relevant to them. Not because of too many emails or wrong timing. 
Just irrelevance. 😬

The data was telling you exactly who they were, and you weren't listening.
Real first-party data strategy means using behavioural signals to drive what happens next.

Someone clicked your email about a specific product three times last month? 
That's a segment. Build a targeted sequence around that interest. 

Someone hasn't opened anything in 90 days? 
Stop sending them your standard newsletter. 
Run a re-engagement sequence, ask one question, and remove whoever doesn't respond. Your deliverability and relevance improve. 
Everything improves.

Segmented campaigns generate up to 760% more revenue than untargeted ones. That's sending the right message to the right person because their own behaviour told you what they needed.


Brands are spending thousands on third-party data and paid social audiences (rented, platform-dependent, increasingly restricted) when their email list already holds more actionable intelligence than most of those sources combined.

Your audience has been telling you exactly what they want all along. 
You just need to start listening.

What's the one first-party data signal you're already tracking but not acting on?

Founder @sendxmail, @zopply, @hotleads | Board Member @APPM | Professor @Univ Lusofona, @Harbour.Space & @ETIC - Email Marketing, Marketing Automation, Brand Online Presence

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The Battle

Leah Tharin

Rui Nunes

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Posts

Engagements

Likes

Performance Score.css-goub6s{font-size:var(--chakra-fontSizes-md);font-weight:500;color:var(--chakra-colors-gray-600);display:block;margin-top:var(--chakra-space-1);}Leah Tharin's LinkedIn Performance

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