Conception / Mechanical Engineer (Internship or CDD)

Location: Paris; candidates must already be based in Paris or be able to relocate immediately

Start date: ASAP

Contract: Internship or CDD, depending on profile and experience

Compensation:

• CDD: Approximately €1,500 net take-home per month
• Internship: Internship stipend (gratification de stage) in line with French law

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

PS. If you are French and 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 contribute to 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 build physical systems with measurement and control. The level of ownership will be adapted to your profile and experience.

Responsibilities

• Design or 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, including basic chemistry and thermodynamics, mass transfer, and heat transfer.
• Support automation and control, including sensor integration, data acquisition, feedback loops, Raspberry Pi, and related systems.
• Build the system: you will source components and contribute to or lead fabrication, depending on your experience. We know what we need, it works on the bench, and we now want the continuously operating version.