Sustainability Internship: Climate & Reporting 2027

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.

Hi, we’re Nexio Projects!

Nexio Projects is a sustainability consultancy of 40+ people headquartered in Rotterdam, serving hundreds of European mid-market clients across CSRD/ESRS, EcoVadis, 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 EcoVadis 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.

Your mission

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.

What you’ll deliver

• 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 EcoVadis, 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 deliverables.
• Build and maintain internal knowledge databases, capturing key regulations and regulatory developments (such as the Omnibus changes and ESRS revisions), data sources, and methodological insights to strengthen collective expertise.
• Research emerging sustainability topics and contribute creative, evidence-based approaches to complex client challenges.
• Support the development of our sustainability finance services by researching market developments, preparing input for proposals and thought leadership, and helping turn project lessons into reusable templates and tools.