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About us

We've run Product & Engineering. Now we fix yours.

Former CPOs and CTOs from Mirakl, Contentsquare, Yousign, and dozens of scale-ups.

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Matthieu

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Alex

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Walid

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Sarah

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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.

Timothe Frin & David Lambert

Co-founders, Stellar

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.

Thibaut

CPO in residence

Thibaut led Engineering & Product at Totem for nearly 5 years, owning delivery for 4 products serving 10k+ users and managing a 12-person tech, product and design team. He rebuilt the platform end-to-end and shipped 2 native mobile apps. He's also co-founder & CTO of WeAssur, an insurance software platform for brokers. École Polytechnique engineer with an MSc from Imperial College London. 12+ years building full-stack products.

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

Axel scaled Uptime's tech and product team from 2 to 30 people in 5 years, equipping 1,000+ elevators with its connected platform. He then led a 30-person engineering team at Cardiologs (FDA and MDR-approved medical device, 2M+ patients per year), driving 10%+ volume growth annually through a successful FDA submission and full cloud migration. 15+ years building tech orgs across IoT, Healthtech and regulated environments.

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.

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.

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.

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.

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

David led Product at April as Head of Product, scaling the Product team from 10 to 35 people. He was previously CPO at Dattak and Lead PM at Finary. Over 11 years he's launched or managed 8 products totaling €30M ARR. A former entrepreneur and SME director, his genius zone is building clear product strategies that accelerate tech growth which he's executed 4 times over.

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

Walid was CPO at Shotgun, the events ticketing & community platform, leading Product across a global team spread over Paris, Lisbon, São Paulo and New York. He previously shipped consumer mobile products at Zenly, Heetch, BlaBlaCar and Qobuz. A decade across some of France's best-known apps. A founding member of FrenchCPO, he's now co-founder & CEO of Tape. MEng in Computer Science from ECE Paris. 10+ years building consumer products at scale.

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 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

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.

Clef de Voûte: 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.

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.

David
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Matthieu
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Walid
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Alex
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Sarah
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Savinien
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