Job Opening: Internship – Sustainable Building and Energy Efficiency Engineer (M/F)

Sinteo, a rapidly growing engineering and consulting firm specializing in sustainable real estate, is seeking its next generation of talent
. We are committed to creating simplified, resilient buildings that are carbon-neutral and energy-efficient.

If you do too :

• Do you want to work toward a real estate sector aligned with climate goals?
• Do you want to play an active role in the environmental transition?
• Are you curious, energetic, and full of ideas?
… then this internship might be just right for you.

Your responsibilities:

You will join the Operations division, which is at the heart of performance challenges for existing buildings.
Under the guidance of a line manager, you will work on a variety of assignments, such as:
• Analyzing and optimizing the energy and carbon performance of commercial buildings: audits, assessments, building management system studies,
ESG evaluations;
• Participating in the energy monitoring of real estate portfolios and contributing to the implementation of concrete action plans
;
• Supporting environmental certification processes during operations (HQE Exploitation, BREEAM In-Use,
, etc.);
• Contribute to strategic and regulatory monitoring of technical innovations and industry developments.
These assignments will allow you to gain firsthand insight into the realities of building operations and understand how the energy transition
is implemented on a daily basis.

This internship will give you the opportunity to develop :

• A practical understanding of how buildings operate and perform in real-world settings;
• Skills in analyzing energy and environmental data;
• A comprehensive overview of ESG certification and assessment processes;
• Cross-functional work experience collaborating with experts from diverse backgrounds (technical, environmental, strategic).
• You will gain independence, expertise, and a deeper understanding of the sustainable real estate sector.

The Sinteo Environment

Joining Sinteo means becoming part of a company on a human scale where cooperation, trust, and knowledge-sharing
are essential.
You’ll work in a challenging yet supportive environment, where everyone is encouraged to learn, contribute ideas, and grow.
The atmosphere is friendly, and there are plenty of opportunities to come together as a team (seminars, internal events, workshops, etc.).

Your assets

Conditions:

• Salary: €1,200 gross/month
• Benefits: meal vouchers (60%), transit passes (50%) or contribution toward a bike-sharing subscription,
gym membership (Gymlib), employee benefits committee, regular internal events
• Duration: 6 months
• Start date: Starting in September 2026
• Location: Marseille

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?

Send my application