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Jannik HasselJH

Jannik Hassel

Auditor | Sustainability Reports

€1,500/day
Düsseldorf, DE
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Jannik

Auditor with many years of Big 4 experience and founder of justReporting GmbH WPG. From auditing complex reporting landscapes and the operational implementation of ESG projects, I know: A sustainability report is not an end product – what happens before, during, and after is crucial. My claim is to create structures that extend beyond the individual reporting cycle: from data management and process control to strategic development. As co-author of the IDW advisory notice on the technology-based implementation of ESG reporting and a lecturer at two universities, I combine regulatory depth with practical implementation experience – and help my clients not only to be compliant in the regulatory jungle of CSRD, ESRS, and EU Taxonomy, but also to proactively consider the next steps.
  • German

    Native or bilingual

  • English

    Fluent

Can work on-site
Düsseldorf (up to 50km), Frankfurt am Main (up to 50km)

Experience

  • Hochschule Düsseldorf
    Lecturer – Data Analytics & Sustainability Reporting (M.Sc.)
    EDUCATION AND E-LEARNING
    April 2025 - Today (1 year and 2 months)
    Düsseldorf, Germany
    Lecturer in the Master's program in Business Analytics at Hochschule Düsseldorf (HSD). Project-based module: Data Analytics in Sustainability Reporting – students work on real ESG data issues using Python, R, and modern AI tools. Focus: How can data-driven approaches be used to improve sustainability reporting and make it auditable?
    ESRS CSRD Sustainability Reporting Auditing
  • DHBW Villingen-Schwenningen
    Lecturer – Internal Control Systems & ESG Reporting (B.Sc.)
    EDUCATION AND E-LEARNING
    October 2024 - Today (1 year and 8 months)
    Villingen-Schwenningen, Germany
    Lecturer in the program Accounting, Taxes, and Business Law – Auditing at DHBW Villingen-Schwenningen – the same university where I completed my dual studies.

    Lecture: Internal Control Systems (IKS) – from the control environment, risk assessment, and control activities to effectiveness testing. With a special focus on sustainability reporting: How does an IKS for ESG data differ from a classic financial IKS? New data sources, different process owners, higher estimation uncertainty – and control systems that must be auditable from the outset.
    Sustainability Reporting Auditing ICS ESRS CSRD
  • ECONECT/hemmer Steuerfachschule GmbH
    Instructor for Sustainability Reporting
    EDUCATION AND E-LEARNING
    August 2024 - Today (1 year and 10 months)
    Dusseldorf, NW, Germany
    Instructor for Sustainability Reporting at ECONECT/hemmer Steuerfachschule – training and workshops for companies and auditors preparing for the creation and auditing of sustainability reports.
    Formats:
    → Grandfathering workshops (3–4 hrs.) for auditors
    → Auditor training (1–2 days): ISAE 3000 and IDW auditing standards
    → ESRS Sprints (half day): individual topic standards (E1, S1, G1)
    → In-house training: tailor-made for audit firms
    Over 400 participants trained.
    → More information on the seminars:
    ESRS Sustainability Reporting CSRD ISAE 3000 Auditing

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Education

  • Auditor
    Chamber of Public Accountants
    2023
    Wirtschaftsprüfer
  • Dual Study Student Accounting, Taxes and Business Law – Auditing
    PwC Germany
    2015
    Dualer Student Rechnungswesen, Steuern und Wirtschaftsrecht – Wirtschaftsprüfung

Skill set

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