Descriptif du poste

Who we are
Mantle8 is a clean-tech start-up revolutionizing natural hydrogen exploration through cutting-edge technology and innovative geologic strategies. Backed by leading clean-tech investors (Breakthrough Energy Ventures, Kiko Ventures), we're scaling up affordable, abundant natural hydrogen exploration — a high-potential energy source for Europe.

The role
As a Geo-Environmental & Permitting Apprentice, you'll support the development of Hydrogeco, Mantle8's flagship project and one of Europe's most advanced natural hydrogen initiatives. Working directly with the Project Director, you'll contribute to the environmental, regulatory and HSE preparation of exploration activities: drilling permit applications, exploration permits (PER), environmental studies and the deployment of a pilot site.
You'll collaborate with geoscientists, drilling engineers, environmental consultants and public authorities across the full lifecycle of a pioneering subsurface energy project.

What you'll be doing
- Permitting & regulatory affairs: prepare drilling permit applications and environmental authorizations (French Mining Code, Environmental Code), manage PER and regulatory monitoring.
- Environmental studies & risk assessment: coordinate baseline studies and consultants (EIA, biodiversity, hydrogeology, noise…), review impact and risk assessments.
- Subsurface environmental management: aquifer protection, induced seismicity, water/soil/gas monitoring, carbon footprint and LCA.
- Industrial safety & drilling support: HSE preparation, well integrity, safety studies (HAZID/HAZOP), hydrogen hazards, ATEX, emergency response planning.
- ESG & project management: ESG reporting, carbon accounting, investor materials, deliverable tracking and permitting trackers.


What we offer
- Work on one of Europe's most advanced natural hydrogen exploration projects
- Full exposure to the development cycle, from permitting to drilling
- Mentorship from multidisciplinary experts (geology, drilling, environment, HSE, project management)
- Rare expertise at the intersection of geosciences, environmental engineering and clean energy

Work environment
Based in Toulouse (12 rue Michel Labrousse, 31100), with frequent field visits across southwest France and close collaboration with the Toulouse and Grenoble teams. A dynamic, international start-up backed by world-leading climate investors.

Profil recherché

Final-year Master's or Engineering School student (apprenticeship) in one of the following disciplines: Environmental Engineering, Geosciences, Hydrogeology, Environmental Sciences, Geological Engineering, HSE / Industrial Risk, or Energy & Environmental Systems.

- Strong interest in subsurface energy projects
- Basic knowledge of environmental regulations and impact assessment
- Excellent analytical and organizational skills
- Strong written and verbal communication skills
- Fluent French and good English

Highly valued: French environmental and mining regulations, mining / energy law, geothermal energy, oil & gas, carbon footprint / LCA, GIS (QGIS or ArcGIS), well integrity, hydrogen technologies.

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 30/06/2026