Sinteo, a sustainable real estate design and consulting firm, is in full expansion and looking for its future talents. We advocate simplified, resilient buildings that are carbon and energy neutral.

If you do too :

- You want to take action for real estate aligned with climate objectives;

- You want to play an active part in the environmental transition;

- You're curious, energetic and full of ideas.

... then this internship might just be for you.

Your tasks :

You will work on a variety of assignments with the Environmental Project Management team:

- Advise on and optimize the construction and environmental renovation of buildings (RE 2020, low-carbon, reuse, dynamic thermal simulation, occupant comfort),

- Carry out studies related to the environmental and energy performance of buildings: heliodon, energy and dynamic thermal simulation, daylighting, life cycle analysis, etc.

- Monitor the execution phase to guarantee environmental performance on delivery,

- Support the client and the project management team in obtaining environmental certifications (HQE, NF Habitat, BREEAM, etc.).

- Participate in the development of our expertise and contribute your ideas, to enrich our knowledge.

This internship will give you the opportunity to :

- Discover the role of environmental project management in construction and renovation projects;

- Understand how efficient, low-carbon and comfortable buildings are designed;

- Participate in environmental simulations and analyses (energy, carbon, daylighting, comfort, etc.).

- Familiarize yourself with environmental standards and certifications (RE2020, HQE, BREEAM, NF Habitat...).

- Collaborate on a daily basis with architects, design offices and project owners on concrete projects;

- Develop your sense of analysis, coordination and teamwork in a stimulating and caring environment.

Your assets

You're in your final year of engineering school or studying for 5 years of higher education, specializing in energy, building or the environment (Centrale, Mines, INSA, UTC, UTBM, etc.).

You're looking for an internship or a gap year, starting in January 2026, in Paris.

Skills and aptitudes

You're interested in the environmental challenges of building: energy efficiency, comfort, low-carbon, reuse of materials...
You have a basic knowledge of thermal engineering, energy or construction acquired during your training.
You're comfortable with IT tools and enjoy manipulating data or modeling to better understand building behavior.
You are curious, a team player and meticulous.
You want to discover environmental design alongside experienced professionals, and contribute to concrete projects.

Beyond skills, we're looking for someone who :

Is motivated by the meaning of his/her mission;
Willing to learn from experts and share ideas;
Enjoys collaborative, demanding and caring environments.

Internship conditions

Duration: 6 months

Start date: Early 2026

Location: Marseille

Gratuity: €1,000 gross per month

Advantages :

Luncheon vouchers (60% reimbursed)
Public transport pass (50%) or Vélib' pass (100%)
Gymlib sports membership
Social Committee
Regular internal events (seminars, workshops, social events)

Our business

Onet, a French family-owned group founded in 1860, is an international player in engineering and services. Its more than 70,000 employees work every day to help create ever healthier, safer and more reliable environments.

More about Onet

Sinteo strives for real estate that serves living beings, combining the expertise of a technical design office with the vision and dynamism of a consulting firm. With offices in Paris, Bordeaux and Marseille, we support our customers in optimizing building performance and comfort, from design to operation. Our 80 employees work to make buildings simpler, more resilient and carbon- and energy-neutral. Sinteo is part of the Onet Group.

Are you interested in this offer?

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