Conception/Mechanical Engineer Intern

Interested? Apply here : https://www.bloomineral.com/job-application

Conception / Mechanical Engineering Intern

Location: Paris

Start date: ASAP

Contract: Internship

Language: English required, French a plus (not mandatory).

PS. If you are french, and you have doubts about your english level but fit the position perfectly, don’t worry we’ll make it work.

About Bloomineral Bloomineral is building a carbon-negative materials platform based on a biomineralization process.

We take CO₂, industrial waste, and seawater, and transform them into solid mineral forms that can be used in industrial materials, replacing emissions-intensive inputs with carbon-storing alternatives.

We're an early-stage team based in Paris. Our current focus is simple: make the science work in real systems and make it scale.

What you’ll do Help turn our systems into something that can scale.

You’ll support the design, construction, and operation of our pilot system. The focus is on conceiving systems that are functional, stable, and ready for scale.

You’ll work within our R&D team to help build physical systems with measurement and control.

Responsibilities

• Support the design of reactors and fluid systems for the pilot systems (lab + shipping container), as well as tools developed for the R&D team (CAD will be required to communicate our plans to contractors).
• Contribute to modelling (basic chemistry and thermodynamics, mass and heat transfer).
• Assist in automation and control (sensor integration, data acquisition, feedback loops, Raspberry Pi, etc.).
• Build the system (you will be the one shopping for screws and tubes, and leading the fabrication: we know what we need, it works on the bench, and we want the continuously working version now!).

Profile

• Engineering student (mechanical, chemical, structural, but ideally multidisciplinary)
• Strong fundamentals in conception, fluid dynamics, structure, and electronics; you’re always involved in hardcore DIY at home
• Familiar with modelling tools, CAD, or simulation environments
• Interest in bioproduction is a plus
• Creative, detail-oriented, good communicator (because of the multidisciplinary nature of the work), comfortable learning quickly.

Why this role You’ll work on real systems with real constraints, not theoretical projects, and real living beings performing the mineralization.

This is a chance to get hands-on experience with pilot-scale infrastructure and see how engineering decisions translate directly into system performance. You’ll be involved from design through to operation.

You’ll join a small, technical, highly international team where interns take high ownership, with exposure to process engineering, biology, and geochemistry in a single system. This internship has the potential in turning into a permanent position.

We care more about curiosity, rigor, and drive than about checking every box. If our mission resonates with you but your profile doesn’t match every single line above, apply anyway. Let’s say you do not know electronics, if you find a pro that can help you learn that skill, we will support you, but we need you to be 1000% motivated.

We’re building a diverse, thoughtful team and we know great people don’t all look the same on paper. If you’re excited about turning carbon into materials the world can build with, we’d love to hear from you.

Interested? Apply here : https://www.bloomineral.com/job-application