Jonathan Maurin

Founder & CEO · Derrick App · Marseille, France

10+ years building B2B sales tools, LinkedIn outreach playbooks + data enrichment workflows. Founded Derrick App (Google Sheets add-on, 31k+ users) and Growth Mindset (B2B agency). Previously founded and sold deux.io, a growth agency. Authored 300+ guides on data enrichment, LinkedIn prospecting + sales automation.

LinkedIn Growth Mindset Email

Expertise

B2B Sales Prospecting LinkedIn Outreach Sales Navigator Data Enrichment Google Sheets Add-ons Cold Email Lead Scoring GDPR Compliance Sales Automation Model Context Protocol (MCP) AI for Sales

Where I work + past ventures

Founder · since 2022

Derrick App

Google Sheets add-on for B2B data enrichment. Find emails, phones, LinkedIn data, SIRET/SIREN, tech stacks - directly in your spreadsheet. 31,000+ users, REST API + MCP server for AI clients.

Visit derrick-app.com →

Founder · since 2018

Growth Mindset

B2B growth agency. Cold email + LinkedIn outreach campaigns for SaaS, consulting + service companies. Tested 100+ outbound playbooks across FR / EU / US markets.

Visit growth-mindset.fr →

Founder · sold · 2014-2025

deux.io

Growth marketing agency I founded and ran for 8 years before exiting (acquired). Helped 200+ B2B SaaS startups build their growth motion - outbound, content, paid, SEO. The experience that taught me what tools sales teams actually need.

Sold in 2025 - no longer active

Published guides (300+)

Over the past 10 years I've published more than 300 guides on B2B sales prospecting, data enrichment, LinkedIn outreach + sales automation. Below the topical hubs I author + maintain on this site, grouped by silo.

Latest from LinkedIn

Recent posts where I share concrete B2B sales tactics, Derrick feature releases, and outbound experiments.

Jonathan Maurin 2026-01

I spent 11 years building outbound machines

From cold email infrastructure to LinkedIn automation - what I learned scaling B2B sales for 100+ companies before building Derrick.

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Jonathan Maurin 2026-01

I sold a marketing agency after 11 years

Why I exited the agency game to build a product (Derrick) - lessons on focus, defensibility + recurring revenue.

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Jonathan Maurin 2025-08

Comparatif solutions phone enrich

Tested the top 7 phone enrichment tools on 100 real B2B profiles. Match rate, price, accuracy - the data speaks.

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Jonathan Maurin 2025-07

New Derrick feature: tiny but mighty

A small product update that ships big value - how we approach feature shipping at Derrick.

View on LinkedIn →

SalesDorado 2026-01

91% des cold emails finissent à la poubelle

Interview chez SalesDorado sur les vraies métriques cold email + comment Derrick aide à survivre les filtres modernes.

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Fill Down: my GTM & sales newsletter

Fill Down: GTM & Sales News is my LinkedIn newsletter on go-to-market and sales: a data-backed take every two weeks on prospecting, enrichment, and outbound that actually converts. The long-form articles below dig into the ideas I test in the field.

Fill Down 2026-07-20

Stop Enriching Your CRM. You're Filling a Bucket With a Hole in It.

Why quarterly CRM cleanups always lose to natural data decay, and why the real fix is enriching at the point of use instead of scrubbing a static store.

Read on LinkedIn →

Fill Down 2026-07-13

Anyone Can Build a Lookalike List in One Click Now. That's Exactly Why Most of Them Are Wrong.

The one-click find-similar button solved the wrong problem. Why your seed list of won deals, not the tool, decides whether a lookalike list is any good.

Read on LinkedIn →

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