About us
About us
We've run Product & Engineering. Now we 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
- Make Product & Engineering fast
- Align both with what drives growth
+40 experts
A collective of former CPOs and CTOs from Europe's top software companies
Our story
Born from a pattern we saw firsthand.
Timothe Frin and David Lambert founded Stellar after observing the same pattern repeat across dozens of scale-ups: Product & Engineering becomes a bottleneck at the worst possible moment, right when the company needs to accelerate.
Tim x David
The problem is never talent, it's the lack of a system. CEOs end up making roadmap calls they shouldn't have to make. Junior CPOs get overwhelmed. Hiring a true senior takes 6-12 months with no guarantee it works. We created Stellar to make the kind of expertise we wished we'd had accessible. Not a consulting firm with juniors and generic playbooks. A collective of practitioners who've already solved the problems we help you solve.
Our team
Operators, not observers.
Our experts don't advise from the outside. They're CPOs and CTOs who've managed teams of 5 to 100+, shipped 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
Yann scaled PeopleDoc from 10 to 400+ employees as CTO and CISO, building a 150-person Product and Tech org serving 4,000 clients at ~$150M ARR across Paris, NYC, London and Frankfurt, through to a $300M exit. 15+ years scaling B2B SaaS from early stage to acquisition.
Axel
CTO
Uptime, Doctolib
Jeremie
CPO in residence
e.g. Docplanner, Life5
Laura
CPO in residence
e.g. Acierto, Adevinta
Viencent
CPO in residence
e.g. Dealfront, ZoomInfo
Marc
CPO in residence
Marc led Product at Boopos, a marketplace connecting business buyers and sellers, building a 7-person Product team (4 designers, 3 PMs) and owning strategy, vision and roadmap end-to-end. He previously ran 100+ user testing sessions at Maite.ai to validate AI-native product decisions before building. 15+ years scaling digital platforms and Product orgs.
Gregoire
CPO in residence
Grégoire led Product at Legrand (€200M revenue, €16M budget), managing a 21-person Product team and scaling delivery across a 180-person organisation. He scaled the smart home platform to 30M+ devices and 1M+ MAU, and integrated Netatmo post-acquisition. 10+ years shipping SaaS and connected products at consumer scale.
Theiss
CPO in residence
Ex : BlaBlaCar, Phenix
Patrick
CPO in residence
Patrick led B2C Product at TheFork (13 PMs, 11 teams) and tripled Agicap's mobile active users in 6 months. At Chauffeur Privé, he cut unpaid invoices by 70% and boosted driver onboarding by 200% for the Lisbon launch. 10+ years shipping consumer and B2B products across Fintech, marketplaces and AI.
Benjamin
CPO in residence
Benjamin doubled Truvi's ARR from £3M to £6M in 18 months and scaled the org from 10 to 50+ people as VP Product. He previously drove Unnax's embedded banking platform from €15M to €100M+ in monthly transaction volume (€1.2B+ annually) across 4 markets. 10+ years building Fintech products that process billions.
Nathalie
CPO in residence
e.g. Lifen, Jaji
Chiara
CPO in residence
Chiara built Product at Cardiologs from conception to acquisition by Philips, scaling from 10 to 80 people and reaching 2M patients diagnosed per year across 5 countries (US-first). She holds 3 product patents and has launched AI-driven health products for Sofinnova Partners, Moon Surgical and Doctolib. 10+ years building Product in regulated Healthtech, from 0-to-1 to acquisition.
Arthur
CPO in residence
Arthur accompanied Papernest through a 50x revenue growth (€1M to €50M) and launched its agency offer, now worth tens of millions in annual revenue. At Dashlane, he led a product reaching 10M users worldwide and drove +10 points of retention through a mobile-to-desktop bridge. 10+ years designing Product orgs that scale 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% funnel conversion, +20% market share through freemium, €1M incremental EBITDA from 20+ pricing moves) after running Stootie as CEO post-acquisition by Cdiscount (revenue per customer +100%, cash burn -50%, NPS of +77). 10+ years turning Product into measurable business impact.
Dani
CPO in residence
Dani doubled Kard's ARR from €1M to €2M in 9 months as VP Product with minimal marketing, through product expansion, pricing and activation improvements. He now builds a bootstrapped AI-native SaaS and scaled Mozza Bytes from 1,000 to 3,000 subscribers in 6 months. 15+ years shipping B2C AI product experiences.
Savinien
CPO in residence
Savinien leads a 30-person Product team at Partoo (€40M ARR, 400,000+ points of sale managed, 330 employees) and launched Jim, an AI agent that now auto-resolves 80% of customer conversations received by clients. 10+ years building and scaling B2B SaaS products.
Ilias
CPO in residence
e.g. ViaSay, 108 Milliards
Sarah
CPO in residence
e.g. Prolong, Comete
Amelie
CPO in residence
Amélie became CEO of Invoxia at 30, scaling AI-native IoT products to nearly 500,000 users and driving the 40-person company to profitability three years in a row. She has launched 8 multi-award-winning products reaching 1M+ paid users across AI, hardware and deeptech. 12+ years turning ambiguity into Product-Market Fit.
Elie
CPO in residence
Elie led Product at Contentsquare, shipping analytics products used by thousands of companies worldwide, after building data and advertising products at Google scale. 15+ years constructing B2B SaaS and data-driven products where scale is the default.
Guillaume
CPO in residence
Guillaume scaled Product at Stuart (40+ cities, +600% deliveries in 24 months, +100% revenue YoY) before building wave.ai, an AI coaching app acquired by Alan after +160% user growth. 15 years shipping tech platforms and AI products at scale, now at Photoroom.
David
CPO in residence
e.g. Finary, April
Christopher
CPO in residence
Christopher scaled Yousign's Product team from 5 to 30 people as CPO and launched a Product-Led Growth motion that generated 50% of new MRR in its first year, all within a highly regulated eSignature market. 15+ years building B2B SaaS and marketplaces where compliance and scale meet.
Alex
CPO in residence
Alex scaled Product at Sunday (launched in 4 countries in 1 month, 1M users in 3 months, $1B GTV in under 2 years) before growing key products 15x in ARR at Scandit. 12 years taking B2B SaaS and B2B2C platforms from zero-to-one to global scale.
Fabrice
CPO in residence
Fabrice led Product at TripAdvisor's TheFork (26 product teams, 300+ people, $1.4B to $2.1B GMV, first-ever profitability) before turning Thiga into a product-led consultancy (€5.7M to €12.5M revenue, 36 to 101 experts). 20+ years driving ROI on Product, Tech and GenAI investments, ex-Deezer and ex-IBM.
Antoine
CPO in residence
Antoine co-founded Youmiam and scaled it from 0 to 2M downloads, 250K MAU and €1M revenue (€2M raised), then led Product at Inmemori, an online tribute service reaching 3M+ users with a 10-person Product team. 12+ years going 0-to-1 and scaling, with AI integration at the core.
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 hypergrowth before co-founding uKu ($3M raised, 5 AI-powered social apps shipped in 2.5 years). A full-stack Product leader (dev, design, product) built for 0-to-1 and AI-native Product-Market Fit.
Matthieu
CPO in residence
Matthieu led Product at Mangopay (2,500+ B2B clients, 26 countries, €3.8B processed) before co-founding Resilience and raising $45M to reshape cancer patient care. 15 years scaling Product where complexity and stakes are highest.
What sets them apart?
- 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 live outside the industry. We shape it. Beyond advisory, Stellar is at the center of the European Product ecosystem. We share what actually works, no commercial filtering.
Clef de Voûte — France's #1 Product podcast
600,000+ listens. Top CPOs, CEOs, and Product Leaders share what worked, what crashed, and what they'd do differently. No polished storytelling. Real, raw, hard-earned insights.
How they build: the newsletter
Deep dives into how top software companies actually build product. Actionable strategies from founders and CPOs.
60+ Product Leaders, 600+ Product talents
Over 3 years, we’ve coached hundreds of Product talents through mentoring programs, alongside France’s top Product Leaders. This network is our strength: we never work alone, mobilizing the best minds in the industry when needed.
Our impact
100+ product & engineering teams and counting.
Our impact
Hypergrowth scale-ups
Need: Ship faster without losing quality as the team doubles every year.
Mature companies under PE pressure
Need: Do more with less. Cut waste, increase output, and prove ROI on every product investment.
Strategic pivots
Need: Redefine the product vision, validate a new market fit, and restructure the team around it.
Concrete results
- €10M+ ARR surpassed: Garantme, Joko, Dayuse
- +40% productivity: Zeliq, Edusign, Tennders
- 3x development speed: Edusign, Pony, Bow Medical
- 90% reduction in critical bugs: Predict4Health, Edusign
- 2x revenue growth: Pony, Siview, Tenacy
Feel like product & engineering are slowing down your growth?
Start with a rapid diagnostic. In 2 weeks, you'll know exactly what's blocking you and how to fix it. No bullshit. No theoretical recommendations. A concrete, actionable plan.
