Sustainability Internship: Climate & Reporting

Nexio Projects is looking for two Sustainability Interns to support our consultants in delivering sustainability finance and reporting work for clients. You will help put climate-related risks and decarbonisation choices into financial terms, build Excel-based models and business cases, and support clients with their CSRD/ESRS and IFRS S2 reporting. Along the way, you will contribute to client projects, take on your own internship mission and learn directly from senior consultants.

This internship suits a final-stage or recent Master's student in finance, economics, econometrics or a related quantitative field who wants to specialise in climate and sustainability, or a sustainability student with strong quantitative and Excel skills who wants to apply them in a hands‑on, client‑facing consultancy setting.

Nexio Projects is a sustainability consultancy of 40+ people headquartered in Rotterdam, serving hundreds of European mid‑market clients across CSRD/ESRS, Eco Vadis, B Corp, CDP and net‑zero strategy. We are a certified B Corp (one of the highest‑scoring B Corp consultancies in the Benelux), a certified Great Place To Work®, a top‑rated consulting firm per Verdantix and consultancy.nl, and a Platinum Eco Vadis strategic consulting partner.

We practise what we advise, and we hire people who combine technical rigour with a light touch: human, humble, hardworking and allergic to taking themselves too seriously.

You will be working alongside our consultants on live client projects, getting hands‑on with the kind of work that actually moves the needle on sustainability, with a particular focus on where sustainability meets finance: putting climate risks and decarbonisation choices into financial terms and supporting clients' CSRD/ESRS and IFRS S2 reporting. As part of your time with us, you will also take on a personal internship mission: a defined project you can call your own (for example a reusable decarbonisation business‑case template or a climate risk quantification tool), develop, and finish with something concrete to show for it.

On top of that, you will learn fast, contribute meaningfully, and be part of a team that does its work passionately.

• Support ESG assessments, carbon footprint calculations, and sustainability gap analyses, including CSRD/ESRS readiness checks, for clients across sectors.
• Build quantitative emissions models, collecting, cleaning, and interpreting large volumes of activity data to produce accurate Scope 1, 2, and 3 inventories that also underpin carbon cost and climate risk analyses.
• Support the team in quantifying climate‑related risks and opportunities in financial terms, for example estimating a client's carbon cost exposure under different carbon price scenarios, or the financial impact of physical hazards on key assets.
• Help build Excel-based financial models, such as decarbonisation business cases, Marginal Abatement Cost Curves and internal carbon pricing analyses, under the guidance of senior consultants.
• Contribute to the preparation of financial effects disclosures under ESRS E1 and IFRS S2, and to data and documentation work that helps make clients' sustainability data audit‑ready.
• Support the team in developing client‑ready sustainability roadmaps and improvement plans, grounded in data and aligned with relevant reporting frameworks.
• Apply and learn assessment methodologies, including Eco Vadis, B Corp, and CDP, and reporting standards such as GRI, UNGC, ESRS and IFRS S1/S2.
• Produce well‑structured reports, presentations, and data visualisations that translate technical findings into clear, actionable recommendations.
• Support project managers on client‑facing calls and assist with preparing client…