Descriptif du poste
🌍 Who we are
Mantle8 is a clean-tech start-up rethinking natural hydrogen exploration, combining cutting-edge technology with sharp geological strategy. We're backed by leading clean-tech investors, including Breakthrough Energy Ventures and Kiko Ventures.
Having just closed a significant Series A, we're entering a defining phase: delivering FLOW, our most ambitious natural hydrogen exploration campaign to date, across multiple geographies and with leading industrial partners. The goal is to unlock the "Geological Trifecta" — high pressure, high purity, and multi-megaton scale, all in one location. Pull that off, and hydrogen at under €1/kg becomes possible.
🎯 What the role is about
As IP Counsel, you'll report directly to our CTO, S. Jammes, and take on a central role in building and running Mantle8's IP strategy across patents, trademarks, trade secrets, and defensive publications. You'll be the internal go-to on IP topics, working closely with the CTO, external counsel, the geoscience and engineering teams, and leadership, while keeping a close eye on the competitive IP landscape.
🧩 What you'll be doing
- Help the CTO shape and evolve Mantle8's IP strategy, turning our technology roadmap into a clear, prioritised set of IP actions.
- Manage our relationships with external patent and trademark counsel, running filings and prosecution end to end.
- Set up and run our invention-disclosure process, working directly with inventors across the company.
- Drive patents from disclosure through to grant, and manage our trademark portfolio.
- Put trade-secret protocols in place where they make strategic sense.
- Build and maintain patent watch reports, and brief the CTO and leadership team on emerging IP risks and opportunities.
- Feed IP insights into product, commercial, and partnership decisions, including M&A and fundraising due diligence.
âž• Nice to have
- Background or interest in subsurface, geoscience, or energy.
- Qualified IP attorney, European Patent Attorney, or French CPI (or working toward it).
- Experience running trade-secret or defensive publication programmes.
- Trademark portfolio management at scale.
- Experience with IP due diligence in fundraising or M&A.
- Willingness to relocate to Grenoble.
🌟 What we offer
- A competitive package, including a corporate welfare plan and supplementary health insurance.
- A permanent contract (CDI) with full French employment protections.
- The chance to build a new clean energy industry from the ground up, based in the French Alps.
Profil recherché
- A technical background — physics, geoscience, engineering, or similar — with at least a Master's degree.
- Professional IP experience: patent drafting, prosecution, or IP strategy, ideally in tech, deep-tech, or energy.
- Enough technical fluency to engage credibly with our geoscience and engineering teams.
- The ability to run a structured patent watch framework.
- Strong written communication, fluent English, French a strong plus.
An entrepreneurial, hands-on mindset — someone who gets things done rather than waiting for a bigger team.
Descriptif de l'entreprise
🇬🇧 Mantle8 is a deep-tech exploration company dedicated to unlocking the potential of natural hydrogen as a new clean energy resource.
By combining advanced geoscience, subsurface modeling and cutting-edge simulation technologies, Mantle8 develops innovative exploration methods to identify and evaluate natural hydrogen systems deep within the Earth.
Our multidisciplinary team brings together geoscientists, engineers, data scientists and explorers who share a common ambition: advancing scientific understanding while building the foundations of a new energy frontier.
From regional exploration concepts to prospect generation and technological development, Mantle8 works at the intersection of research, innovation and industrial application to accelerate the emergence of natural hydrogen as part of the global energy transition.
At Mantle8, exploration is not only about discovering new resources — it is about expanding knowledge, challenging assumptions and building solutions for the future of energy.
Why is everything in English if Mantle8 is based in the heart of the French Alps?
Because Mantle8 is an international adventure.
As of March 2026, our team includes 21 people representing 9 different nationalities. This diversity is one of our greatest strengths, and English is the language that allows everyone to collaborate, debate ideas and build things together.
We love our home in the French Alps, but inside Mantle8 our common ground is English — from meetings and technical discussions to emails and, yes, even our jokes.
So if you’re thinking about joining us, English is not just helpful — it’s essential to be part of the conversation.
🇫🇷 À propos de Mantle8
Mantle8 est une entreprise deep-tech d’exploration dédiée à révéler le potentiel de l’hydrogène naturel comme nouvelle ressource d’énergie propre.
En combinant géosciences avancées, modélisation du sous-sol et technologies de simulation de pointe, Mantle8 développe des méthodes d’exploration innovantes permettant d’identifier et d’évaluer les systèmes d’hydrogène naturel présents en profondeur dans la Terre.
Notre équipe pluridisciplinaire réunit géoscientifiques, ingénieurs, data scientists et explorateurs partageant une ambition commune : faire progresser la connaissance scientifique tout en construisant les bases d’une nouvelle frontière énergétique.
De la génération de concepts d’exploration régionaux à l’identification de prospects et au développement technologique, Mantle8 opère à l’interface entre recherche, innovation et application industrielle afin d’accélérer l’émergence de l’hydrogène naturel dans la transition énergétique mondiale.
Chez Mantle8, l’exploration ne consiste pas seulement à découvrir de nouvelles ressources — il s’agit aussi d’élargir la connaissance, de remettre en question les certitudes et de construire des solutions pour l’énergie de demain.
Pourquoi tout est-il en anglais alors que Mantle8 est basée au cœur des Alpes françaises ?
Parce que Mantle8 est avant tout une aventure internationale.
Début mars 2026, notre équipe compte 21 personnes représentant 9 nationalités différentes. Cette diversité est l’une de nos plus grandes forces, et l’anglais est la langue qui nous permet de collaborer, de débattre d’idées et de construire ensemble.
Nous sommes très attachés à notre ancrage dans les Alpes françaises, mais chez Mantle8 notre langue commune est l’anglais — que ce soit pour les réunions, les discussions techniques, les e-mails et, oui, même nos blagues.
Donc si vous envisagez de nous rejoindre, l’anglais n’est pas seulement utile : il est essentiel pour faire partie de l’aventure.
Le 03/07/2026