CEO Right Hand Intern

At Ilion Water Technology, a watertech spin-off from the École Normale Supérieure (ENS) in Paris, we are developing an innovative pressure-free reverse osmosis technology, stemming from our nanofluidics research work.

Our technology, currently under development, has already been recognized with several distinctions, notably:

• Winner of the Innovation Award at Pollutec Paris 2024;

• Finalist of the Miriam Balaban competition, organized by the European Desalination Society 2025;

• Currently in the running for the international desalination competition XPRIZE.

We are confident that our approach can simplify the operating conditions of reverse osmosis skids and significantly reduce their cost and environmental impact. Indeed, our pressure-free technology has anti-fouling properties aimed at decreasing energy consumption and the need for chemical products. It also integrates a system for real-time water quality monitoring.

Paris 75005 (On-site) | Start date: March 2026 Contract: Internship - Full-time - 6 months

About Ilion

At Ilion Water Technologies, we are developing cutting-edge desalination and water treatment technologies rooted in fundamental science. Our work combines nanofluidics, electro-driven processes, and advanced membrane engineering to solve the water industry's urgent operational, cost, and environmental challenges.

Your mission as CEO Right Hand

You'll be the ultimate support for our CEO, Lucie Ries, helping to drive our mission and scale our ambition fast. Think co-pilot: assisting with tasks, dissecting problems, finding innovative solutions, and crafting action plans. This role is super varied – you'll be key in building our A-Player team, prepping for exciting new ventures, and supporting all things HR, finance, legal, and office management.

If you're passionate about deep tech, sustainability, and entrepreneurship, and are looking for a challenging yet rewarding internship, we want to hear from you!

What you will do

• Refining our business plan and conducting analysis for future fundraising.

• Conducting market research, providing key insights.

• Helping cultivate relationships with stakeholders (investors, clients, partners).

• Preparing materials for All-Hands and board meetings.

• Supporting our HR strategy to hit recruitment goals.

What we offer

A stimulating role in a mission-driven startup where your ideas have a real impact.

• High exposure to venture capital and the startup ecosystem

• Supportive, agile and talented team

• Strong growth & learning opportunities

• Restaurant card (Swile) and 50% Navigo pass reimbursement

What you bring

• Strong analytical skills – data-driven problem-solver.

• Experience in fast-paced environments.

• Serious autonomy and eagerness to learn daily.

• Exceptional attention to detail and high versatility.

• Passion for entrepreneurship and thriving in dynamic settings.

• Outstanding communication skills (written and verbal).

• English proficiency (ideally, multinational experience)

Send us your CV and Motivation letter at jobs@ilion-watertech.com