Chief of Staff (Bras droit) to the CEO

Kumulus Water; Paris; On-site; EUR 10,000 - 17,000; Part time

Job summary

Kumulus Water is seeking a Chief of Staff Intern to work directly with the CEO during a critical fundraising and growth phase. This role carries high exposure to strategic priorities and cross-functional initiatives.

You will contribute to fundraising documents, manage the data room, support grant applications, and assist in day-to-day operations and strategic thinking. English and French fluency required for fast-paced, international collaboration.

Qualifications

• Education: Student or graduate from a tier-one engineering or business school.
• Hard skills: Financial modelling and PowerPoint skills.
• Soft skills: Team player, self-motivated with an entrepreneurial spirit.
• Languages: Fluent in English and French.
• Experience: Prior internship in fast-growing start-ups, audit/strategy/M&A, or corporate strategy is a plus.

Responsibilities

• Fundraising & Investor Relations: Review and maintain data room, keep materials investor-ready.
• Contribute to funding documents: financial model, pitch deck, executive summaries.
• Attend investor meetings and negotiations with the CEO.
• Own follow-ups and manage fundraising pipeline end-to-end.

Skills

Financial modelling

Teamwork

Education

Tier-one engineering or business school

Tools

PowerPoint

Job description

As Chief of Staff Intern, you will work directly alongside the CEO during a pivotal fundraising and growth phase for the company. This is a high-responsibility, high-exposure role at the heart of Kumulus' most critical strategic priorities.

What You'll Be Doing

Fundraising & Investor Relations

• Review, maintain, and continuously improve the data room, ensuring all materials are accurate and investor-ready

• Contribute to key funding documents including the financial model, pitch deck, and executive summaries

• Attend investor meetings and negotiations alongside the CEO

• Own follow-ups and help manage the fundraising pipeline end-to-end

Grant & Public Funding Applications

• Identify relevant public funding opportunities, grants, and innovation programs (French, European, and international)

• Lead application processes, manage timelines, and coordinate with internal stakeholders to assemble submission materials

CEO Support & Company Operations

• Act as an extension of the CEO in day-to-day operations but also in strategic thinking

• Track team deliverables and follow up on key action items across all ongoing projects

• Support cross-functional project management across sales, deployment, and product workstreams

Education: Student or graduate from a tier-one engineering or business school

Hard skills required: Financial modelling and PowerPoint skills

Soft skills: Team player, self-motivated person with an entrepreneurial spirit

Language: Fluent in English and French

Experience: Previous internship experiences in fast-growing start-ups, audit/strategy/M&A firms or in corporate strategy departments are a strong plus.