Guillaume Lerouge is a Partner at Hexa Sprint, where he leads its inaugural European defence cohort. His work focuses on defence, dual-use technology and strategic supply-chain resilience.
He began his career by launching a collaboration-software consultancy while still a student. He then joined XWiki’s executive team with responsibility for sales, marketing and project delivery. As a partner at La Javaness, he ran programmes including Thales Cyber@Station F and Facebook Startup Garage before leading large-scale AI deployments. He subsequently spent three years at Thales Digital Factory, helping startups work with the group and deploy secure cloud technology.
Guillaume is also an angel investor in defence and sovereignty companies. He works with founders on strategy, fundraising, hiring and navigating demanding institutional sales, combining early conviction with practical help around co-founder alignment and institutional decision processes.
Where Guillaume can help
- defence tech
- dual-use
- deep tech
- venture studio
- fundraising
Operating and investing experience
A selection of companies and roles connected to Guillaume Lerouge.
Ventures
Hexa
Partner.
Hexa Sprint
leads the European defence cohort.
La Javaness
former partner who ran startup programmes including Thales Cyber@Station F and Facebook Startup Garage.
XWiki
former executive-team member responsible for sales, marketing and project delivery.
Thales Digital Factory
spent three years helping startups collaborate with the group and working on secure cloud technologies.
Highlights
- Leads the inaugural European defence cohort at Hexa Sprint.
- Previously ran startup programmes at La Javaness and spent three years helping startups collaborate with Thales Digital Factory.
- Invests personally in defence and sovereignty startups, including companies working in AI, autonomous systems, advanced materials and aerospace.
Questionsfounders ask aboutGuillaume Lerouge
Where can Guillaume help founders?
Guillaume assists founders with commercial strategy in dual-use tech, managing complex enterprise procurement cycles, and navigating institutional relationships across Europe.
Which company-building situations are most relevant to Guillaume’s experience?
His background is most directly applicable to deep tech, defence, and dual-use startups preparing to raise capital and engage institutional or enterprise customers.
What perspective does Guillaume bring as a mentor?
He brings hands-on venture-studio and corporate-innovation experience, combining venture-building discipline with deep familiarity with European defence ecosystems.
The best mentors spot the best founders early.
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