Systems that keep running after I leave: AI agents plugged into your tools, prospecting machines and programmatic SEO. Below is the work, with the proof.
Built for my own products first, so every system here runs in production.
Product · Co-founder
Derrick, from a side project to +31K users
I co-founded Derrick in October 2022, one day a week at first. It is now a B2B data enrichment and prospecting platform: web app, Google Sheets sidebar, MCP server and API.
Growth and product, from acquisition to retention
Lists built from one sentence, then enriched with emails and phones
Derrick web app: describe who you are looking for, get the list, the emails and the phones.
AI · MCP server
An MCP server that turns Claude into a prospecting workspace
I built Derrick’s MCP server myself. Claude, ChatGPT or any MCP client can find leads, emails, phones and company data in plain English, with the cost shown before anything runs.
Find 20 heads of sales at SaaS companies in Lyon, with their work email.
● Derrick MCP · search leads, then find work emails
Estimated cost shown before running
Here are 20 heads of sales, 17 with a verified email. Want me to add their phone numbers?
Illustrative conversation
AI · Agent team
A team of Claude agents that runs Derrick’s marketing
Seven areas of marketing run on Claude agents with written roles and rules. Each area has a pilot that checks the output before anything goes out, and nothing ships without passing two gates.
SEO, LinkedIn, video, analytics, newsletter, outbound, feature factory
A mechanical lint and an independent judge on every text
An outbound engine published as a Claude Code plugin
From an ICP to messages written in your own voice: the agent sources, enriches until it finds a usable signal, writes, advises the sequence and pushes the leads, then learns from the replies every week.
Messages written in the user’s voice, from their past conversations
A pre-push check that never overwrites a lead in an active campaign
Weekly review of replies, with lookalikes of positive ones
A programmatic system of 90+ variables behind 500+ pages, built to rank city by city on high-intent searches and generate 35 to 50 leads per month for the agency.
Pages that still brought 88 clicks a day two years later
More than 100 page variations built from a Google Sheet before usable AI existed. Two years later, with no further SEO work, they still brought 88 clicks a day. Then a real system took over.
100+ variations, each checked for duplicate content
Now new page families in two languages
Recurring work handled by agents under written rules
Claude agents plugged into your CRM, spreadsheets, database and internal APIs through MCP servers.
B2B prospecting machine
Targeting, enrichment, buying signals, outbound sequences and CRM sync.
Automation
The repetitive marketing and sales tasks, handled by Make, APIs and scripts.
Programmatic SEO
Hundreds of useful pages generated from data, checked before they ship.
Part-time head of growth
Priorities, tests and measurement, one or two days a week.
How I work.
01
30-minute call
We look at the real numbers and the process you want to change. You leave with a scoped proposal and a price.
02
Short mission or 1 to 2 days a week
Either a turnkey system delivered in a few weeks, or a part-time head of growth role. Remote.
03
Documented handover
Everything I build is written down and runs without me: instructions, rules, checks and dashboards.
What people say.
“
Jonathan est très réactif et a su développer des compétences techniques poussées pour mettre en place des méthodes de growth hacking. Au fil du temps, il a su étendre son périmètre de l’opérationnel à la stratégie pour nous accompagner dans notre croissance.
Joel GaudeulFormer client · Revenue & Operations LeaderLinkedIn“
One of my favorite tool in my stack. It’s allow me to manage my leads directly in GSheet but also go further into Programmatic SEO. I recommand a lot, every sales or growth must have Derrick his stack
Erwann LefevreDerrick userTrustpilot“
I have been using other expensive apps or freemium like phantombuster, but Derrick has replaced them all. I love the simplicity of the Google sheet add-in, but what it best is the efficiency it delivers results with. It is very stable and rarely gives you wrong data.
JWJulien Walon CohenCEO & Co-founder, DifflyG2
Got a process that should run on its own?
Tell me what your team does by hand every week. I will tell you what can be automated, what should stay human, and what it would cost.
