About Us
About Us
We've managed product and engineering. Now we'll fix yours.
Former CPOs and CTOs from Mirakl, Contentsquare, Yousign, and dozens of European scale-ups.


Matthieu


Alex


Walid


Jordane


Sarah


Savinien
Let's work together
What We Do
- Make Product & Engineering Effective
- Accelerate Product & Engineering
- Align both with the factors that drive growth
+40 experts
A group of former CPOs and CTOs from Europe's leading software companies
Our story
Born from a pattern we witnessed firsthand.
Timothe Frin and David Lambert founded Stellar after noticing the same pattern recurring across dozens of scale-ups: Product & Engineering becomes a bottleneck at the worst possible moment—just when the company needs to accelerate.

Tim and David
The problem is never a lack of talent; it's the lack of a system. CEOs end up making strategic decisions they shouldn't have to make. Junior CPOs get overwhelmed. Hiring a truly experienced senior professional takes 6–12 months, with no guarantee of success. We created Stellar to make the kind of expertise we wished we'd had readily available. We're not a consulting firm staffed with junior consultants and generic playbooks. We're a collective of practitioners who've already solved the very problems we help you solve.
Our team
Operators, not observers.
Our experts don’t offer advice from the sidelines. They are CPOs and CTOs who have managed teams ranging from 5 to over 100 people, launched products to millions of users, and navigated hypergrowth, restructurings, and strategic pivots firsthand.
Axel


CPO
KEYPROD, Iktos, Phacet, RedPill SAS
Thibaut


e.g., Totem, WeAssur
CPO in residence
Antoine


CTO
D-EDGE, LeanTechLeaders
Yann


CTO
As CTO and CISO, Yann scaled PeopleDoc from 10 to over 400 employees, building a 150-person Product and Tech organization serving 4,000 clients with approximately $150 million in ARR across Paris, New York City, London, and Frankfurt, leading to a $300 million exit. He has over 15 years of experience scaling B2B SaaS companies from the early stages through to acquisition.
Axel


CTO
Uptime, Doctolib
Jeremie




CPO in residence
e.g., Docplanner, Life5
Laura



CPO in residence
e.g., Acierto, Adevinta
Vincent



CPO in residence
e.g., Dealfront, ZoomInfo
Marc




CPO in residence
Marc leads Product at Boopos, a marketplace connecting business buyers and sellers, where he is building a 7-person Product team (4 designers, 3 PMs) and is responsible for end-to-end strategy, vision, and roadmap. Previously, he conducted over 100 user testing sessions at Maite.ai to validate AI-native product decisions before development. He has over 15 years of experience scaling digital platforms and Product organizations.
Gregoire




CPO in residence
Grégoire is a Product Lead at Legrand (€200 million in revenue, €16 million budget), managing a 21-person product team and scaling delivery across an 180-person organization. He scaled the smart home platform to over 30 million devices and over 1 million monthly active users (MAU), and integrated Netatmo following the acquisition. He has over 10 years of experience delivering SaaS and connected products at consumer scale.
Theiss




CPO in residence
Examples: BlaBlaCar, Phenix
Patrick





CPO in residence
Patrick led the B2C product team at TheFork (13 product managers, 11 teams) and tripled Agicap’s active mobile users in six months. At Chauffeur Privé, he reduced unpaid invoices by 70% and increased driver onboarding by 200% for the Lisbon launch. He has over 10 years of experience launching consumer and B2B products across fintech, marketplaces, and AI.
Benjamin




CPO in residence
As VP of Product, Benjamin doubled Truvi’s ARR from £3 million to £6 million in 18 months and scaled the team from 10 to over 50 people. Previously, he grew Unnax’s embedded banking platform from €15 million to over €100 million in monthly transaction volume (over €1.2 billion annually) across four markets. He has over 10 years of experience building fintech products that process billions of transactions.
Nathalie



CPO in residence
e.g., Lifen, Jaji
Chiara




CPO in residence
Chiara built the product at Cardiologs from inception through its acquisition by Philips, scaling the team from 10 to 80 people and reaching 2 million patients diagnosed annually across five countries (starting in the U.S.). She holds three product patents and has launched AI-driven health products for Sofinnova Partners, Moon Surgical, and Doctolib. She has over 10 years of experience building products in the regulated health tech sector, from initial development through to acquisition.
Arthur




CPO in residence
Arthur guided Papernest through a 50-fold increase in revenue (from €1 million to €50 million) and launched its agency services, which now generate tens of millions in annual revenue. At Dashlane, he led a product that reached 10 million users worldwide and increased retention by more than 10 percentage points through a mobile-to-desktop integration. He has over 10 years of experience designing product organizations that scale both performance and cohesion.
Clement




CPO in residence
e.g., PrestaShop, BforBank
Clark



CPO in residence
e.g., Kpler, SLB
Harith




CPO in residence
Harith scaled LegalStart as CPO (40% increase in funnel conversion, 20% increase in market share through the freemium model, €1 million in incremental EBITDA from over 20 pricing adjustments) after serving as CEO of Stootie following its acquisition by Cdiscount (100% increase in revenue per customer, 50% reduction in cash burn, NPS of 77). Over 10 years of experience turning product development into measurable business impact.
Dani


CPO in residence
As VP of Product, Dani doubled Kard’s ARR from €1 million to €2 million in nine months with minimal marketing, through product expansion, pricing, and activation improvements. He is now building a bootstrapped AI-native SaaS company and scaled Mozza Bytes from 1,000 to 3,000 subscribers in six months. He has over 15 years of experience delivering B2C AI product experiences.
Savinien




CPO in residence
Savinien leads a 30-person Product team at Partoo (€40 million in annual recurring revenue, over 400,000 points of sale managed, 330 employees) and launched Jim, an AI agent that now automatically resolves 80% of customer inquiries received by clients. He has over 10 years of experience building and scaling B2B SaaS products.
Ilias



CPO in residence
e.g., ViaSay, 108 Billion
Sarah



CPO in residence
e.g., Prolong, Comete
Amelie




CPO in residence
Amélie became CEO of Invoxia at age 30, scaling AI-native IoT products to nearly 500,000 users and leading the 40-person company to profitability for three consecutive years. She has launched eight multi-award-winning products that have reached over 1 million paying users across AI, hardware, and deep tech. With over 12 years of experience, she has a proven track record of turning ambiguity into product-market fit.
Elie




CPO in residence
Elie leads the Product team at Contentsquare, where he oversees the delivery of analytics products used by thousands of companies worldwide, having previously built data and advertising products at Google’s scale. He has over 15 years of experience building B2B SaaS and data-driven products where scale is the norm.
Guillaume




CPO in residence
Guillaume scaled the product at Stuart (40+ cities, 600% increase in deliveries over 24 months, 100% year-over-year revenue growth) before founding wave.ai, an AI coaching app acquired by Alan following 160% user growth. With 15 years of experience launching tech platforms and AI products at scale, he is now at Photoroom.
David




CPO in residence
e.g., Finary, April
Christopher


CPO in residence
As CPO, Christopher scaled Yousign’s Product team from 5 to 30 people and launched a product-led growth initiative that generated 50% of new MRR in its first year, all within a highly regulated e-signature market. He has over 15 years of experience building B2B SaaS platforms and marketplaces where compliance and scalability intersect.
Alex


CPO in residence
Alex scaled the product at Sunday (launched in four countries in one month, reached 1 million users in three months, and achieved $1 billion in GTV in under two years) before growing key products 15-fold in ARR at Scandit. He has 12 years of experience taking B2B SaaS and B2B2C platforms from concept to global scale.
Fabrice



CPO in residence
Fabrice led Product at TripAdvisor's TheFork (26 product teams, 300+ employees, $1.4 billion to $2.1 billion in GMV, achieving profitability for the first time) before transforming Thiga into a product-led consultancy (€5.7 million to €12.5 million in revenue, growing from 36 to 101 experts). Over 20 years of experience driving ROI on investments in Product, Tech, and GenAI, formerly at Deezer and IBM.
Antoine


CPO in residence
Antoine co-founded Youmiam and grew it from 0 to 2 million downloads, 250,000 monthly active users, and €1 million in revenue (€2 million raised), then led Product at Inmemori, an online memorial service with over 3 million users and a 10-person Product team. He has over 12 years of experience in building products from scratch and scaling them, with a focus on AI integration.
Walid




CPO in residence
e.g., Zenly, Heetch, Sotgun
Olivier


CPO in residence
Olivier scaled ManoMano’s Product team from 3 to 25 people during a period of hypergrowth before co-founding uKu (which raised $3 million and launched 5 AI-powered social apps in 2.5 years). He is a full-stack Product leader (development, design, product) with expertise in building products from scratch and achieving AI-native Product-Market Fit.
Matthieu




CPO in residence
Matthieu was Head of Product at Mangopay (2,500+ B2B clients, 26 countries, €3.8 billion processed) before co-founding Resilience and raising $45 million to transform cancer patient care. He has 15 years of experience scaling products in environments where complexity and stakes are at their highest.
What makes them stand out?
- They don't sell a method.
- They know when to push, when to simplify, when not to over-engineer, and when discipline matters more than innovation.
Because they've already done it. Multiple times.
Our product ecosystem
We don't operate on the fringes of the industry. We shape it. Beyond consulting, Stellar is at the heart of the European product ecosystem. We share what actually works, without any commercial bias.

Clef de Voûte — France's #1 Product Podcast
Over 600,000 listens. Top CPOs, CEOs, and product leaders share what worked, what failed, and what they’d do differently. No polished storytelling. Real, raw, hard-earned insights.

How They Build: The Newsletter
In-depth looks at how leading software companies actually build their products. Actionable strategies from founders and CPOs.



60+ product leaders, 600+ product professionals
Over the past three years, we’ve mentored hundreds of product professionals through mentoring programs, in collaboration with France’s top product leaders. This network is our strength: we never work alone, drawing on the best minds in the industry whenever needed.
Our impact
Over 100 product and engineering teams—and counting.
Our impact
Hypergrowth scale-ups
Need: Deliver faster without compromising quality as the team doubles in size every year.
Mature companies under pressure from private equity firms
Need: Do more with less. Cut waste, increase output, and demonstrate a return on investment for every product investment.
Strategic pivots
Need: Redefine the product vision, validate a new market fit, and restructure the team accordingly.








Tangible results
- €10 million+ in annual recurring revenue (ARR) surpassed: Garantme, Joko, Dayuse
- +40% productivity: Zeliq, Edusign, Tennders
- 3x faster development: Edusign, Pony, Bow Medical
- 90% reduction in critical bugs: Predict4Health, Edusign
- 2x revenue growth: Pony, Siview, Tenacy
Feel like product & engineering are holding back your growth?
Start with a quick assessment. In two weeks, you’ll know exactly what’s holding you back and how to fix it. No nonsense. No theoretical advice. Just a concrete, actionable plan.









