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Things I learned by doing the work.

Only things I have used with real clients. Nothing recycled from a post that was true three years ago. RSS

Health-tech · 6 min read · 2 November 2026

How Qured made its booking flow convert better

The story behind Qured's +247% session-to-booking result: how I rebuilt the tracking first, found the leaking step and tested the booking flow every week.

Building in public · 6 min read · 2 November 2026

The bug that made my AI agent say "done" when it wasn't

What building an AI agent taught me about the word done: how I found a false-completion bug in RoastMyFlow, how I proved it and how I fixed it for good.

Hiring growth · 6 min read · 2 November 2026

Head of Growth vs Head of Marketing: which comes first?

Head of Growth or Head of Marketing first? How I help founders decide, based on their stage and on who is already on the team, and where a fractional lead fits.

Experimentation · 6 min read · 2 November 2026

Onboarding funnel analysis: where users drop off

How I analyse an onboarding funnel step by step: agree the steps, check the data, read each drop-off, split it by who left, then decide what to fix first.

Analytics · 7 min read · 2 November 2026

How to write a tracking plan (with a free template)

The tracking plan I write with every client on day one: what goes in each column, the order I fill it in, the GA4 rules I check, and a free template to copy.

Hiring growth · 7 min read · 2 November 2026

Seven signs it is time to hire a fractional CMO

A seven-point checklist to score your company on, what your score means, and how to tell whether you need a fractional CMO or a Head of Growth for the work.

Building in public · 5 min read · 20 October 2026

I built an AI agent that walks any flow on your website

How I built RoastMyFlow, an AI agent that walks any flow on your website as your customer, and how it keeps getting better with every roast it runs.

Building in public · 6 min read · 20 October 2026

Why I put my prices on my website

Why I show my consultant pricing openly, how I repriced when I retired The Growth Hustlers, and why I am treating my first three sales as a price test.

Analytics · 6 min read · 20 October 2026

GA4 or PostHog: which one should an early-stage startup use?

GA4 vs PostHog, from someone who runs both. When I pick GA4, when I pick PostHog, when I run the two together, and how PostHog compares with Mixpanel.

Hiring growth · 6 min read · 20 October 2026

How much a fractional CMO costs in the UK

UK fractional CMO day rates and monthly retainers, how they compare with a Head of Growth salary, and my own prices, shown openly with what each one includes.

Hiring growth · 6 min read · 25 September 2026

What a fractional Head of Growth actually does

What the role means, what I do in a normal week, and the two ways I work with a team. Also how to tell whether you need a fractional Head of Growth yet.

Experimentation · 4 min read · 19 September 2026

How to run experiments that build on each other

Most testing programmes end up as a folder of unclear results. The difference is not cleverer tests. It is what happens before and after each one.

Analytics · 4 min read · 17 September 2026

Six checks that tell you whether your GA4 is lying

An afternoon of work that usually explains the number nobody in your company can agree on. None of these six checks needs a developer to get started.

Analytics · 4 min read · 15 September 2026

Startup analytics setup: what I do first, and in what order

Most growth work fails in the first two weeks, before anyone has run a campaign. Here is the order I set things up in, and why each step needs the one before.

Giovanni Perri

A thirty-minute call, no slides.

If I am not the right fit, I will say so on the call and tell you who is.