Descriptif du poste
WHO WE ARE :
Mantle8 is a fast-growing deeptech startup exploring and developing natural hydrogen, a clean, abundant energy source generated by the Earth itself.
We are at a rare moment: the birth of a whole new industry. Our ambition is not only to make Mantle8 known, but to make Mantle8 the thought leader of natural hydrogen — the company that embodies and tells the story of this industry to the world.
That's where you come in. You'll join with a genuine blank page and real freedom to act, reporting directly to our CEO, to build the voice and image of a pioneering company.
Your role is built around three strategic objectives:
1. Increase the visibility of natural hydrogen worldwide. Make the topic known beyond the circle of specialists, reaching international audiences (talent, industrial partners, media, institutions). In-depth content, social media presence, press relations, SEO — every lever to establish the subject in the energy transition conversation.
2. Position Mantle8 as the reference of the industry. Build a strong editorial line and a distinctive brand voice that make Mantle8 the company people think of when they talk about natural hydrogen. Showcase the expertise of our CEO and geoscientists, produce original viewpoints and analysis, embody the industry.
3. Ensure consistency across all our channels. Make sure our website, our LinkedIn and all our content tell one and the same story aligned and up to date in service of the two objectives above.
Day to day, you will :
- Lead Mantle8's LinkedIn presence: editorial calendar, content creation, performance tracking (reach, engagement, follower growth) and regular reporting.
- Design compelling visual assets (posters, social media visuals, brochures, web content) consistent with the Mantle8 brand identity.
- Contribute to internal and external communication: newsletters, news, press relations, events.
- Maintain and update the website (news, content).
- Create harmonized, reusable job-description templates for all company recruitment.
- Monitor developments in energy, natural hydrogen and the deeptech startup ecosystem to feed your content.
WHY JOIN US :
- Real impact: you contribute directly to a mission that matters — the energy transition and the fight against climate change.
- Genuine autonomy: reporting to the CEO, you'll lay the foundations of Mantle8's -communication strategy and see your ideas come to life — not just execute them.
- A passionate, supportive team: geoscientists, researchers and entrepreneurs driven by curiosity, integrity and scientific rigor.
- Concrete benefits: meal vouchers, company health insurance and complementary social protection.
- A high-value learning experience for the rest of your career, in a booming sector (cleantech / deeptech).
Profil recherché
- Master's level (Bac+4-5) in marketing, communication or a business school, on a work-study track.
- A real strategic instinct: you don't just want to produce content, you want to think about how a brand is positioned and how to make a complex subject desirable.
- Excellent writing skills in French; a strong level of English is important (international team, partners and ambition).
- Good command of visual creation tools (Canva, Adobe Suite or equivalent) and professional social media, LinkedIn in particular.
- Organized, autonomous and proactive: you like to structure and create rather than follow a ready-made playbook.
- Genuine curiosity for scientific topics, the energy transition and the deeptech startup world.
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 29/07/2026