Job Description

On site

Full time – Internship (6 months)

Your future team

The regulatory landscape around corporate sustainability is evolving at an unprecedented pace, placing ESG reporting quality and independent assurance at the heart of investor and stakeholder confidence.

Deloitte Luxembourg’s Audit & Assurance practice is growing its Sustainability & Specialized Assurance team to help organizations navigate, manage and report on their sustainability performance with quality and rigor. Our clients span financial services, corporate and industrial sectors, as well as public and international organizations.

As a Trainee in the ESG Assurance team, you will join a group of dedicated professionals working at the forefront of European sustainability regulation and reporting. Following an initial training period, you will be involved in client engagements, gaining practical exposure to ESG assurance methodology and developing a strong technical foundation in one of the most sought-after areas of professional services today. Strong performers may be considered for a permanent opportunity upon completion of the internship.

The advantages of joining us

• Gain meaningful, hands-on experience in one of the fastest-growing and high-impact areas of professional services
• Work alongside recognized ESG and assurance specialists in an innovative, purpose-driven team
• Benefit from structured mentoring, continuous feedback and Deloitte’s world-class learning ecosystem, including tailored sustainability and professional development programmes
• Contribute to engagements that shape how organizations report on and are held accountable for their sustainability impact
• Thrive in an inclusive, multicultural environment where diverse perspectives fuel innovation and collaboration

How you’ll contribute to our success

• Support ESG assurance engagements on sustainability disclosures prepared under CSRD/ESRS, SFDR and EU Taxonomy, progressively applying Deloitte’s ESG assurance methodology (ISAE 3000 – ISSA 5000) under the supervision of more experienced colleagues
• Perform substantive testing of ESG metrics (e.g., GHG emissions, energy and water consumption, workforce data and EU Taxonomy KPIs), helping to assess data quality, challenge reporting approaches and evaluate underlying assumptions
• Contribute to the preparation of working papers, management letters and client-facing presentations, ensuring procedures, findings and conclusions are documented clearly and accurately
• Assist with regulatory research and market intelligence by tracking developments in CSRD, SFDR 2.0, EU Taxonomy and related frameworks, and by contributing to internal notes and market studies
• Play an active role in team life and cross-functional engagements within the wider Audit & Assurance practice, supporting internal projects and knowledge-sharing initiatives

Your skills

Must have

• Currently pursuing or recently completing a Master’s degree in sustainability, economics, finance, accounting, environmental sciences or a related discipline
• Genuine interest in sustainability, ESG reporting and/or audit and assurance, with motivation to build a long-term career in sustainability assurance within a Big Four environment
• Strong analytical mindset with attention to detail and ability to work with both quantitative and qualitative information
• Good command of Microsoft Office (Excel, PowerPoint, Word) and curiosity toward digital tools, data analytics and AI-enabled solutions

Nice to have

• Prior academic or professional exposure to sustainability reporting, ESG data analysis or audit
• Hands-on experience with data analytics tools (e.g., Power BI, Python, Alteryx) or AI-enabled solutions in an academic or professional context
• Any additional language is considered an asset

Soft skills

• Collaborative mindset and ability to work effectively in diverse teams
• Intellectual curiosity, initiative and willingness to learn from feedback
• Ability to deliver value through structured, high-quality work and documentation

Interested? Please submit your resume and a short cover letter in English.

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With more than 2,600 employees and 98 nationalities, Deloitte Luxembourg is one of the Grand Duchy’s largest, strongest and oldest professional services firms. For more than 75 years, our talented teams have been serving clients in various industries, delivering high added-value offerings to national and international clients in audit and assurance, consulting, financial advisory, risk advisory, tax and related services. Deloitte Luxembourg is part of the global Deloitte network.

Deloitte provides leading professional services to nearly 90% of the Fortune Global 500® and thousands of private companies. Our people deliver measurable and lasting results that help reinforce public trust in capital markets and enable clients to transform and thrive. Building on its 180+-year history, Deloitte spans more than 150 countries and territories. Learn how Deloitte’s over 470,000 people worldwide work together every day to make an impact that matters at www.deloitte.com.