FOR B2B STARTUP FOUNDERS
Get to €1M in revenue - before burnout, wasted months, or guesswork kill your momentum.
Get to €1M in revenue - before burnout, wasted months, or guesswork kill your momentum.
With my intensive 1:1 advisory program, I turn B2B founders into sales and growth experts
with field-proven systems that eliminate months of trial and error so they can find real product-market-fit, build a predictable pipeline and close more deals with confidence.
With my intensive 1:1 advisory program, I turn B2B founders into sales and growth experts with field-proven systems that eliminate months of trial and error so they can find real product-market-fit, build a predictable pipeline and close more deals with confidence.
Join 1k+ founders on The First One Million Newsletter
With my intensive 1:1 advisory program, I turn B2B founders into sales and growth experts with field-proven systems that eliminate months of trial and error so they can find real product-market-fit, build a predictable pipeline and close more deals with confidence.
Join 1k+ founders on The First One Million Newsletter
“Guillaume was key in crafting
the right sales process for us. ”
"Working with Guillaume was incredible for both me and the company. It helped me transition from a founder who knew some sales to one who was confident as a salesperson and later on sales leader. Guillaume also was key in crafting the right sales process for us. His expertise helped us go upmarket, close the first clients, allowing us to close significantly larger opportunities. He also greatly contributed in the recruitment of our first hires in the sales team. All in all, Guillaume was a game-changer for our growth!"
Eiso KANT
Co-founder of poolside ai,
raised $626M.
Ex CEO and Founder of Athenian,
“Guillaume was key in crafting
the right sales process for us. ”
"Working with Guillaume was incredible for both me and the company. It helped me transition from a founder who knew some sales to one who was confident as a salesperson and later on sales leader. Guillaume also was key in crafting the right sales process for us. His expertise helped us go upmarket, close the first clients, allowing us to close significantly larger opportunities. He also greatly contributed in the recruitment of our first hires in the sales team. All in all, Guillaume was a game-changer for our growth!"
Eiso KANT
Co-founder of poolside ai,
raised $626M.
Ex CEO and Founder of Athenian,
“Guillaume was key
in crafting
the right sales process
for us. ”
"Working with Guillaume was incredible for both me and the company. It helped me transition from a founder who knew some sales to one who was confident as a salesperson and later on sales leader. Guillaume also was key in crafting the right sales process for us. His expertise helped us go upmarket, close the first clients, allowing us to close significantly larger opportunities. He also greatly contributed in the recruitment of our first hires in the sales team. All in all, Guillaume was a game-changer for our growth!"
Eiso KANT
Co-founder of poolside ai,
raised $626M.
Ex CEO and Founder of Athenian,
“Getting excellent at Sales
and 2x our ARR
in 3 months"
"As a SaaS founder, Guillaume's coaching has been transformative for me to become excellent at sales. In just three months, we've seen our monthly recurring revenue double. Deals now close faster, with our deal size soaring to four times its previous value, all while improving predictability. Leveraging his startup founder background, Guillaume also provides invaluable insights into our strategy, positioning, pricing, and recruitment. His impact has been profound to Escape!"
Tristan KALOS
CEO & Co-founder of
Escape, the API Security Platform,
Raised $6M in Seed,
YCombinator W2023.
“Getting excellent at Sales
and 2x our ARR
in 3 months"
"As a SaaS founder, Guillaume's coaching has been transformative for me to become excellent at sales. In just three months, we've seen our monthly recurring revenue double. Deals now close faster, with our deal size soaring to four times its previous value, all while improving predictability. Leveraging his startup founder background, Guillaume also provides invaluable insights into our strategy, positioning, pricing, and recruitment. His impact has been profound to Escape!"
Tristan KALOS
CEO & Co-founder of
Escape, the API Security Platform,
Raised $6M in Seed,
YCombinator W2023.
“Getting excellent at Sales
and 2x our ARR
in 3 months"
"As a SaaS founder, Guillaume's coaching has been transformative for me to become excellent at sales. In just three months, we've seen our monthly recurring revenue double. Deals now close faster, with our deal size soaring to four times its previous value, all while improving predictability. Leveraging his startup founder background, Guillaume also provides invaluable insights into our strategy, positioning, pricing, and recruitment. His impact has been profound to Escape!"
Tristan KALOS
CEO & Co-founder of
Escape, the API Security Platform,
Raised $6M in Seed,
YCombinator W2023.
“His ability to define and articulate our core messaging has significantly enhanced how our prospects perceive us.”
"Thanks to his profound understanding of sales processes, Guillaume played a significant role in helping us win a crucial RFP. Moreover, his ability to define and articulate our core messaging has significantly enhanced how our prospects perceive us, ensuring our message resonates deeply with our target audience. Furthermore, Guillaume's insights into startup sales dynamics and strategic positioning of our product offering have been instrumental in elevating our business acquisition strategies."
Romain LIBEAU
Co-founder & CEO of Pivot
“His ability to define and articulate our core messaging has significantly enhanced how our prospects perceive us.”
"Thanks to his profound understanding of sales processes, Guillaume played a significant role in helping us win a crucial RFP. Moreover, his ability to define and articulate our core messaging has significantly enhanced how our prospects perceive us, ensuring our message resonates deeply with our target audience. Furthermore, Guillaume's insights into startup sales dynamics and strategic positioning of our product offering have been instrumental in elevating our business acquisition strategies."
Romain LIBEAU
Co-founder & CEO of Pivot
“His ability to define and articulate our core messaging has significantly enhanced how our prospects perceive us.”
"Thanks to his profound understanding of sales processes, Guillaume played a significant role in helping us win a crucial RFP. Moreover, his ability to define and articulate our core messaging has significantly enhanced how our prospects perceive us, ensuring our message resonates deeply with our target audience. Furthermore, Guillaume's insights into startup sales dynamics and strategic positioning of our product offering have been instrumental in elevating our business acquisition strategies."
Romain LIBEAU
Co-founder & CEO of Pivot
“As an engineer, working with Guillaume is like having a seasoned business cofounder.”
"Working with Guillaume is like having a seasoned business cofounder. He has been tremendously helpful with our go-to-market efforts. We revamped our whole sales messaging and are now approaching prospects with a value-selling strategy. Guillaume provides clear, practical advice that helps us better address our market and prospects."
Remi LOUF
Co-founder & CEO of dot.txt
Raised $9M in Seed
“As an engineer, working with Guillaume is like having a seasoned business cofounder.”
"Working with Guillaume is like having a seasoned business cofounder. He has been tremendously helpful with our go-to-market efforts. We revamped our whole sales messaging and are now approaching prospects with a value-selling strategy. Guillaume provides clear, practical advice that helps us better address our market and prospects."
Remi LOUF
Co-founder & CEO of dot.txt
Raised $9M in Seed
“As an engineer, working with Guillaume is like having a seasoned business cofounder.”
"Working with Guillaume is like having a seasoned business cofounder. He has been tremendously helpful with our go-to-market efforts. We revamped our whole sales messaging and are now approaching prospects with a value-selling strategy. Guillaume provides clear, practical advice that helps us better address our market and prospects."
Remi LOUF
Co-founder & CEO of dot.txt
Raised $9M in Seed
“Formulating &
implementing a crisp GTM
Strategy”
"With Guillaume we sharpened our commercial proposition substantially. His (1) tangible support on formulating a crisp GTM strategy, (2) coaching and reflection sessions on sales execution, (3) creation of materials such as business cases, sales pitches and investor updates, proved valuable. With his support, we generated more influx and throughput in our sales pipelines. Highly recommended."
Bart VOORN
CEO & Co-founder of Strm
Raised $5M in Seed
“Formulating &
implementing a crisp GTM
Strategy”
"With Guillaume we sharpened our commercial proposition substantially. His (1) tangible support on formulating a crisp GTM strategy, (2) coaching and reflection sessions on sales execution, (3) creation of materials such as business cases, sales pitches and investor updates, proved valuable. With his support, we generated more influx and throughput in our sales pipelines. Highly recommended."
Bart VOORN
CEO & Co-founder of Strm
Raised $5M in Seed
“Formulating &
implementing a crisp GTM
Strategy”
"With Guillaume we sharpened our commercial proposition substantially. His (1) tangible support on formulating a crisp GTM strategy, (2) coaching and reflection sessions on sales execution, (3) creation of materials such as business cases, sales pitches and investor updates, proved valuable. With his support, we generated more influx and throughput in our sales pipelines. Highly recommended."
Bart VOORN
CEO & Co-founder of Strm
Raised $5M in Seed
“Working with Guillaume is
transformational
for our go-to-market efforts.”
"Working with Guillaume is transformational for our go-to-market efforts. We completely revamped our messaging and positioning, making it much clearer and more compelling to our target audience. Guillaume helped me design an actionable lead generation strategy and a sales process that I now confidently run. His sharp feedback and strategic insights on sales have been saving me months of trial and error. I couldn’t recommend him more to any founder serious about getting serious about GTM & Sales."
Roxane Fishcher
CEO & Co-founder of Anyshift
Raised $3.2M in Pre-Seed
“Working with Guillaume is
transformational
for our go-to-market efforts.”
"Working with Guillaume is transformational for our go-to-market efforts. We completely revamped our messaging and positioning, making it much clearer and more compelling to our target audience. Guillaume helped me design an actionable lead generation strategy and a sales process that I now confidently run. His sharp feedback and strategic insights on sales have been saving me months of trial and error. I couldn’t recommend him more to any founder serious about getting serious about GTM & Sales."
Roxane Fishcher
CEO & Co-founder of Anyshift
Raised $3.2M in Pre-Seed
“Working with Guillaume is
transformational
for our go-to-market efforts.”
"Working with Guillaume is transformational for our go-to-market efforts. We completely revamped our messaging and positioning, making it much clearer and more compelling to our target audience. Guillaume helped me design an actionable lead generation strategy and a sales process that I now confidently run. His sharp feedback and strategic insights on sales have been saving me months of trial and error. I couldn’t recommend him more to any founder serious about getting serious about GTM & Sales."
Roxane Fishcher
CEO & Co-founder of Anyshift
Raised $3.2M in Pre-Seed
“We started closing major deals,
faster and with more predictability”
"Before working with Guillaume, I saw sales more as an art than a science. We had no sales process or tooling in place. Guillaume made us structure our go-to-market, especially our sales motion, from messaging and pipeline management to objection handling and enterprise sales.
Thanks to his coaching, we started closing major deals with top-tier logos and more importantly, doing it faster and more predictably over time."
Sebastien Charrier
Co-founder & CEO of Bump.sh
Raised $3M
“We started closing
major deals,
faster and with more
predictability”
"Before working with Guillaume, I saw sales more as an art than a science. We had no sales process or tooling in place. Guillaume made us structure our go-to-market, especially our sales motion, from messaging and pipeline management to objection handling and enterprise sales.
Thanks to his coaching, we started closing major deals with top-tier logos and more importantly, doing it faster and more predictably over time."
Sebastien Charrier
Co-founder & CEO of Bump.sh
Raised $3M
“We started closing
major deals,
faster
and with more
predictability”
"Before working with Guillaume, I saw sales more as an art than a science. We had no sales process or tooling in place. Guillaume made us structure our go-to-market, especially our sales motion, from messaging and pipeline management to objection handling and enterprise sales.
Thanks to his coaching, we started closing major deals with top-tier logos and more importantly, doing it faster and more predictably over time."
Sebastien Charrier
Co-founder & CEO of Bump.sh
Raised $3M
“No fluff, no theory,
Just focused, hands-on execution.”
"Working with Guillaume completely upgraded our game. He helped us design and iterate a sales motion that actually fit our product, market, and stage.
He helped to structure our sales org from scratch hiring, onboarding, incentives, playbooks. Everything.
We now have a lead generation engine that works, and our marketing finally drives sales, not vanity.
He pushed us to stop hiding behind automation and start selling value.
No fluff, no theory, Just focused, hands-on execution.
Highly recommend if you're serious about building a GTM machine that scales."
William DETRY
Co-founder & CEO of Simplyccure
“No fluff, no theory,
Just focused,
hands-on execution.”
"Working with Guillaume completely upgraded our game. He helped us design and iterate a sales motion that actually fit our product, market, and stage.
He helped to structure our sales org from scratch hiring, onboarding, incentives, playbooks. Everything.
We now have a lead generation engine that works, and our marketing finally drives sales, not vanity.
He pushed us to stop hiding behind automation and start selling value.
No fluff, no theory, Just focused, hands-on execution.
Highly recommend if you're serious about building a GTM machine that scales."
William DETRY
Co-founder & CEO of Simplyccure
“No fluff, no theory,
Just focused,
hands-on execution.”
"Working with Guillaume completely upgraded our game. He helped us design and iterate a sales motion that actually fit our product, market, and stage.
He helped to structure our sales org from scratch hiring, onboarding, incentives, playbooks. Everything.
We now have a lead generation engine that works, and our marketing finally drives sales, not vanity.
He pushed us to stop hiding behind automation and start selling value.
No fluff, no theory, Just focused, hands-on execution.
Highly recommend if you're serious about building a GTM machine that scales."
William DETRY
Co-founder & CEO of Simplyccure
“Implementing powerful closing
strategies and tactics”
"Guillaume has empowered us with a clear and compelling sales narrative. His invaluable assistance in deal negotiations, crafting persuasive pitches, and implementing powerful closing strategies and tactics has been transformative. His background and expertise in enterprise sales make him an exceptional asset for any entrepreneur or account executive looking to elevate their sales game."
Jean-Loup KARST
Co-founder of joinsecret.com,
the #1 SaaS deals marketplace
for startups.
“Implementing powerful closing
strategies and tactics”
"Guillaume has empowered us with a clear and compelling sales narrative. His invaluable assistance in deal negotiations, crafting persuasive pitches, and implementing powerful closing strategies and tactics has been transformative. His background and expertise in enterprise sales make him an exceptional asset for any entrepreneur or account executive looking to elevate their sales game."
Jean-Loup KARST
Co-founder of joinsecret.com,
the #1 SaaS deals marketplace
for startups.
“Implementing powerful closing
strategies and tactics”
"Guillaume has empowered us with a clear and compelling sales narrative. His invaluable assistance in deal negotiations, crafting persuasive pitches, and implementing powerful closing strategies and tactics has been transformative. His background and expertise in enterprise sales make him an exceptional asset for any entrepreneur or account executive looking to elevate their sales game."
Jean-Loup KARST
Co-founder of joinsecret.com,
the #1 SaaS deals marketplace
for startups.
“I would recommend him
to any CEO who is trying
to crack the first customers”
"Guillaume has been so helpful during our founder-led sales phase, we covered all topics: pricing, sales decks, outreach templates, weekly goals and much more. He's been a great coach and companion and would recommend to any CEO who is trying to crack the first customers."
Carlos DELGADO
Co-founder and CEO of Uptail.ai
“I would recommend him
to any CEO who is trying
to crack the first
customers”
"Guillaume has been so helpful during our founder-led sales phase, we covered all topics: pricing, sales decks, outreach templates, weekly goals and much more. He's been a great coach and companion and would recommend to any CEO who is trying to crack the first customers."
Carlos DELGADO
Co-founder and CEO of Uptail.ai
“I would recommend him
to any CEO who is trying
to crack the first
customers”
"Guillaume has been so helpful during our founder-led sales phase, we covered all topics: pricing, sales decks, outreach templates, weekly goals and much more. He's been a great coach and companion and would recommend to any CEO who is trying to crack the first customers."
Carlos DELGADO
Co-founder and CEO of Uptail.ai
“Navigate the intricate interplay
between
market/product/customer”
"Guillaume is, without a doubt, an outstanding operator. His profound knowledge of the SaaS world and the sales process is rarely matched. Guillaume's dedication to delivering exceptional results is essentially a status quo for him. What sets Guillaume apart is his comprehensive understanding of both internal and external factors that shape a SaaS business and its products. He can really navigate the intricate interplay between market/product/customer, allowing him to offer invaluable insights and strategies that drive success."
Alex KUDELKA
Co-founder & CRO of Glassfy, USA
“Navigate the intricate interplay
between
market/product/customer”
"Guillaume is, without a doubt, an outstanding operator. His profound knowledge of the SaaS world and the sales process is rarely matched. Guillaume's dedication to delivering exceptional results is essentially a status quo for him. What sets Guillaume apart is his comprehensive understanding of both internal and external factors that shape a SaaS business and its products. He can really navigate the intricate interplay between market/product/customer, allowing him to offer invaluable insights and strategies that drive success."
Alex KUDELKA
Co-founder & CRO of Glassfy, USA
“Navigate the intricate interplay
between
market/product/customer”
"Guillaume is, without a doubt, an outstanding operator. His profound knowledge of the SaaS world and the sales process is rarely matched. Guillaume's dedication to delivering exceptional results is essentially a status quo for him. What sets Guillaume apart is his comprehensive understanding of both internal and external factors that shape a SaaS business and its products. He can really navigate the intricate interplay between market/product/customer, allowing him to offer invaluable insights and strategies that drive success."
Alex KUDELKA
Co-founder & CRO of Glassfy, USA
“Makes me focus
on what really matters”
"Working with Guillaume has been a game changer. He helps me take a step back from the daily grind and focus on what really matters. I no longer feel like I’m managing my business alone — I now have someone I can rely on to challenge my thinking and validate my decisions, outside of the day-to-day pressure. His perspective brings clarity and confidence to my actions."
Fabien CHARBIT
Co-founder & CEO of Sush.io, USA
“Makes me focus
on what really matters”
"Working with Guillaume has been a game changer. He helps me take a step back from the daily grind and focus on what really matters. I no longer feel like I’m managing my business alone — I now have someone I can rely on to challenge my thinking and validate my decisions, outside of the day-to-day pressure. His perspective brings clarity and confidence to my actions."
Fabien CHARBIT
Co-founder & CEO of Sush.io, USA
“Makes me focus
on what really matters”
"Working with Guillaume has been a game changer. He helps me take a step back from the daily grind and focus on what really matters. I no longer feel like I’m managing my business alone — I now have someone I can rely on to challenge my thinking and validate my decisions, outside of the day-to-day pressure. His perspective brings clarity and confidence to my actions."
Fabien CHARBIT
Co-founder & CEO of Sush.io, USA
About me
About me
About me
Over the past ten years, I've crafted revenue engines & teams, and sold software for startups and scale-ups. I joined Algolia as employee number 11, second in the business team, contributed to building and developing the revenue engine from $1M to $65M ARR globally. Transitioning to Datadog enriched my knowledge of enterprise sales methodologies.
Leaving Datadog, I founded Terality, securing close to $2M in Seed funding. We've scaled to a team of 8, with hundreds of users for our data processing engine designed for data scientists.
Since early 2022, I've been dedicated to empowering elite SaaS founding teams, accelerating their growth through top-notch sales and go-to-market strategies.
In 2024, I joined the founders of poolside.ai to create the GTM motion, and help raise the $500M Series B. I left poolside at the end of 2024 as the team was in place, to focus again on helping several founding teams.
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