Nathan Guillaumin
I build AI-native GTM systems for B2B companies | Claude Code · MCP · Outbound Infrastructure
Most B2B teams don't have a lead generation They have an infrastructure problem.
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Wrong signals. Disconnected tools. Sequences built without strategy. And an AI layer slapped on top that doesn't change anything fundamental. I build GTM systems where AI is the engine, not the add-on. That means two things depending on where you are: - For teams ready to go fully AI-native: I design and implement end-to-end architectures using Claude Code, Skills and MCP servers. Your team operates the entire system in natural language. - For teams building on proven infrastructure: I design signal-based AI GTM systems using Clay, intent data, and outbound automation. Right targeting. Right message. Right timing. Integrated into your existing stack : HubSpot, Attio, Lemlist, La Growth Machine, LinkedIn, and more. Both approaches share the same foundation: a real GTM strategy baked in, not bolted on. ICP definition. Signal scoring. Sequencing logic. Copywriting frameworks. All of it embedded into the system so you don't need to think about I've worked with 200+ B2B companies (from early-stage startups to PhantomBuster, Axa and Bouygues) on GTM strategy, outbound infrastructure, and lead generation. If you want to build that kind of infrastructure for your team, reach out. com
GTM Index
- AKIMBOJOB
- Growth Mgr7M
Growth Manager
Akimbo
- NATHAN GUILLAUMINJOB
- GTM and Lead Generation Ex…7Y 7M
GTM and Lead Generation Expert
Nathan Guillaumin
I help B2B companies design and operate scalable Go-To-Market systems that consistently generate qualified leads and revenue, while integrating AI into those systems to accelerate growth. As a freelance GTM Engineer, I work hands-on across strategy, data, tooling and execution to build end-to-end acquisition engines that do not rely on guesswork. My work typically includes: • Designing GTM architectures aligned with ICP, positioning and revenue goals • Building signal-based prospecting systems using data enrichment and automation • Sourcing and enriching leads via Clay, APIs and workflow automation • Creating outbound and inbound workflows across email, LinkedIn and multichannel demand •…
- ARCHITECT OPSJOB
- Head of Growth5M
Head of Growth
Architect Ops
- PHANTOMBUSTERJOB
- Lead Growth Partner11M
Lead Growth Partner
PhantomBuster
I helped PhantomBuster customers succeed with advanced lead generation and automation use cases. As a Lead Growth Partner, I coach founders, sales and growth teams through webinars, office hours and 1-to-1 support to help them build scalable GTM systems. I contributed to PhantomBuster’s growth from 8M€ to 13M€ ARR by driving customer adoption, value creation and expansion.
- Client Growth Partner1Y
Client Growth Partner
PhantomBuster
Part Coach, part Consultant, and part Product Expert, my role was focused on helping customers achieve more with PhantomBuster and advising them on top-notch lead-gen strategies. I was in charge of growing the accounts and reducing churns of PhantomBuster customers by : - Planning and hosting user calls with the most strategic customers (+20 calls a week) - Animating the community of +2000 users (answering questions, sharing use cases...) - Co-hosting bi-monthly webinars and weekly office hours on the topics of lead generation - Creating new videos to help users creating their lead generation workflows
- LEADIXJOB
- Growth Outbound Mgr1Y 4M
Growth Outbound Manager
Leadix
Working at Leadix as Growth Outbound Manager. I am in charge of launching designing and crafting outbound strategies and campaigns for the clients. The channels we focus on are LinkedIn and emailing. The clients I've worked with so far : - NX Digital - NX Services - P2S Management Consulting
- WOLTERS KLUWERJOB
- Growth & Mktg Specialist11M
Growth & Marketing Specialist
Wolters Kluwer
I was working at Wolters Kluwer as a Growth and Digital Marketing freelancer. For Legisway and Easyquorum legal softwares my main tasks were : - Organizing events and webinars to attract and qualify leads and prospects. - Launching outreach and social selling strategies. - Developing the awareness of the softwares in France, Belgium and Spain.
- BEYOND GROWTHJOB
- Growth Outbound Specialist2Y 3M
Growth Outbound Specialist
Beyond Growth
I am working as a Growth Specialist at Beyond Growth to help social and environmental companies to better grow. At Beyond Growth, we believe in a world in which companies have a positive impact on the environment and on the society. And that's why I decided to join the agency and help impact startups and SMEs to grow ! So far, I've been working for : - Surfrider Foundation - NGO promoting the conservation of our Ocean. - Jobs that make sense - job board for impactful jobs. - Pando Fashion - CSR auditing agency for the Fashion brands. - Vizcab - B2B SaaS for construction operators. - Stoque Marquet - Marketplace for restaurants ... and many more.
- WECANDOOJOB
- Growth and Sales Ops1Y 3M
Growth and Sales Ops
Wecandoo
At Wecandoo, I was in charge of improving marketing and sales operations on Hubspot CRM. Basically, my role was to get feedbacks from the Sales team on how they use Hubspot so I could create a backlog of tasks to help them with the final goal of improving efficiency. I then created workflows and automations, built new pipelines and custom properties to help each Sales rep saving +4h/week. Another main role was to launch an outbound marketing strategy : definition of the personas, data scraping and enrichment, cold outreach.
- SCALEZIA.JOB
- Growth Expert and Advisor3Y 7M
Growth Expert and Advisor
Scalezia.co
Scalezia is a French Growth Marketing agency I am helping as a coach and advisor. It's quite simple : they have many clients with growth issues and I train them on a 1-to-1 format to reach the best performances with outbound, CRM optimization and marketing and sales automations.
- BULLDOZERJOB
- Head of Growth2Y 1M
Head of Growth
Bulldozer
Bulldozer is a French Growth freelancers collective. Basically, we help SMEs, startups and scale ups to validate their right Growth channels, Value propositions and target audiences for scaling their marketing and sales. At Bulldozer, I work as a Growth Manager. I am in charge on working on the marketing strategies and their implementation. So far, I've been working for : - Lingo - Web3 startup. - Morgan Phillips (Comptables.com platform) - job board platform. - Charitips - B2B SaaS (Donation as a Service) - Daloop - B2B SaaS (eMobility).
- Job: PhantomBuster — Lead Growth Partner · 2025-03 – 2026-02 — I helped PhantomBuster customers succeed with advanced lead generation and automation use cases. As a Lead Growth Partner, I coach founders, sales and growth teams through webinars, office hours and 1-to-1 support to help them build scalable GTM systems. I contributed to PhantomBuster’s growth from 8M€ to 13M€ ARR by driving customer adoption, value creation and expansion.
- Job: PhantomBuster — Client Growth Partner · 2024-03 – 2025-03 — Part Coach, part Consultant, and part Product Expert, my role was focused on helping customers achieve more with PhantomBuster and advising them on top-notch lead-gen strategies. I was in charge of growing the accounts and reducing churns of PhantomBuster customers by : - Planning and hosting user calls with the most strategic customers (+20 calls a week) - Animating the community of +2000 users (answering questions, sharing use cases...) - Co-hosting bi-monthly webinars and weekly office hours on the topics of lead generation - Creating new videos to help users creating their lead generation workflows
- Job: Akimbo — Growth Manager · 2026-01 – present
- Job: Beyond Growth — Growth Outbound Specialist · 2022-01 – 2024-04 — I am working as a Growth Specialist at Beyond Growth to help social and environmental companies to better grow. At Beyond Growth, we believe in a world in which companies have a positive impact on the environment and on the society. And that's why I decided to join the agency and help impact startups and SMEs to grow ! So far, I've been working for : - Surfrider Foundation - NGO promoting the conservation of our Ocean. - Jobs that make sense - job board for impactful jobs. - Pando Fashion - CSR auditing agency for the Fashion brands. - Vizcab - B2B SaaS for construction operators. - Stoque Marquet - Marketplace for restaurants ... and many more.
- Job: Nathan Guillaumin — GTM and Lead Generation Expert · 2019-01 – present — I help B2B companies design and operate scalable Go-To-Market systems that consistently generate qualified leads and revenue, while integrating AI into those systems to accelerate growth. As a freelance GTM Engineer, I work hands-on across strategy, data, tooling and execution to build end-to-end acquisition engines that do not rely on guesswork. My work typically includes: • Designing GTM architectures aligned with ICP, positioning and revenue goals • Building signal-based prospecting systems using data enrichment and automation • Sourcing and enriching leads via Clay, APIs and workflow automation • Creating outbound and inbound workflows across email, LinkedIn and multichannel demand •…
- Job: Wecandoo — Growth and Sales Ops · 2023-01 – 2024-04 — At Wecandoo, I was in charge of improving marketing and sales operations on Hubspot CRM. Basically, my role was to get feedbacks from the Sales team on how they use Hubspot so I could create a backlog of tasks to help them with the final goal of improving efficiency. I then created workflows and automations, built new pipelines and custom properties to help each Sales rep saving +4h/week. Another main role was to launch an outbound marketing strategy : definition of the personas, data scraping and enrichment, cold outreach.
- Job: Wolters Kluwer — Growth & Marketing Specialist · 2024-04 – 2025-03 — I was working at Wolters Kluwer as a Growth and Digital Marketing freelancer. For Legisway and Easyquorum legal softwares my main tasks were : - Organizing events and webinars to attract and qualify leads and prospects. - Launching outreach and social selling strategies. - Developing the awareness of the softwares in France, Belgium and Spain.
- Job: Scalezia.co — Growth Expert and Advisor · 2020-09 – 2024-04 — Scalezia is a French Growth Marketing agency I am helping as a coach and advisor. It's quite simple : they have many clients with growth issues and I train them on a 1-to-1 format to reach the best performances with outbound, CRM optimization and marketing and sales automations.
- Job: Architect Ops — Head of Growth · 2026-03 – present
- Job: Leadix — Growth Outbound Manager · 2024-01 – 2025-05 — Working at Leadix as Growth Outbound Manager. I am in charge of launching designing and crafting outbound strategies and campaigns for the clients. The channels we focus on are LinkedIn and emailing. The clients I've worked with so far : - NX Digital - NX Services - P2S Management Consulting
- Job: Bulldozer — Head of Growth · 2022-03 – 2024-04 — Bulldozer is a French Growth freelancers collective. Basically, we help SMEs, startups and scale ups to validate their right Growth channels, Value propositions and target audiences for scaling their marketing and sales. At Bulldozer, I work as a Growth Manager. I am in charge on working on the marketing strategies and their implementation. So far, I've been working for : - Lingo - Web3 startup. - Morgan Phillips (Comptables.com platform) - job board platform. - Charitips - B2B SaaS (Donation as a Service) - Daloop - B2B SaaS (eMobility).
- School: Grenoble Ecole de Management — Master's degree, Digital Marketing - Purchasing - Negotiation - Management of Imports and Exports - Corporate finance
- School: Wild Code School — Web development
- School: Budapest University of Technology and Economics — Bachelor's degree, Management and Business Economics
- School: Université Jean Monnet Saint-Etienne — Diplôme Universitaire de Technologie, Techniques de commercialisation - Business
Skills
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