Jonathan Maurin
Founder & CEO · Derrick App · Marseille, France
10+ years building B2B sales tools, LinkedIn outreach playbooks + data enrichment workflows. Founded Derrick App in 2022 (B2B data enrichment web app, also in Google Sheets, Claude and the API, 34k+ 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.
Expertise01 / 06
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
Ventures02 / 06
Where I work + past ventures
Derrick App
B2B data enrichment web app, nothing to install. Find emails, phones, LinkedIn data, SIRET/SIREN, tech stacks. The same actions run in Google Sheets, in Claude (MCP) and through the REST API. 34,000+ users.
- Founded
- 2022
- HQ
- Marseille
- G2
- 4.5 / 5
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 →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 activeGuides03 / 06
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.
LinkedIn04 / 06
Latest from LinkedIn
Recent posts where I share concrete B2B sales tactics, Derrick feature releases, and outbound experiments.
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.
View on LinkedIn →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.
View on LinkedIn →Comparatif solutions phone enrich
Tested the top 7 phone enrichment tools on 100 real B2B profiles. Match rate, price, accuracy - the data speaks.
View on LinkedIn →New Derrick feature: tiny but mighty
A small product update that ships big value - how we approach feature shipping at Derrick.
View on LinkedIn →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.
View on LinkedIn →Newsletter05 / 06
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.
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 →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 →Try Derrick06 / 06
Try Derrick free
100 credits/month, no credit card. Open the web app, nothing to install: import a list or paste LinkedIn URLs and get emails, phones and company data in minutes.
Install the add-on and enrich your lists without leaving your spreadsheet.
Install in Google Sheets →
https://app1.derrick-app.com/mcp Call the same enrichment endpoints straight from your own stack or workflow.
Read the API docs →- Founded
- 2022
- Headquarters
- Marseille, France
- Rated on G2
- 4.5 / 5
- Users
- 34,000+