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ISCC – International Sustainability and Carbon Certification is one of the leading certification systems for sustainability, traceability and the reduction of greenhouse gas emissions. Our activities and impact are expanding and our teams are growing exponentially since the last 3 years. To strengthen our ISCC EU team, we are looking forward to welcoming you as a Sustainability Manager – Biomass Fuels at our headquarters in  Cologne . In this role, you will play a key part in developing and advancing ISCC’s sustainability and certification framework for biomass-based fuels, with a particular focus on biogas, biomethane, and bioLNG. You will support and further strengthen the ISCC EU certification scheme, including traceability, chain of custody, and greenhouse gas (GHG) aspects, in line with the overarching principles of ISCC EU and related regulatory requirements, while working closely with internal teams, auditors, regulators, and external stakeholders. If you are passionate about sustainability and would like to join a culturally certified Great Place to Work®   company with highly motivated and diverse teams making a real difference, we look forward to your application!   Your main duties will be:   Developing and refining ISCC principles, criteria, and indicators related to biogas, biomethane, and bioLNG value chains Monitoring, interpreting, and assessing relevant legislation and market developments affecting biomass fuels Analysing global and regional market needs and identifying opportunities for system optimisation and further development Strengthening internal expertise on biomass fuel supply chains, including mass balance systems, traceability approaches, GHG calculations, and auditability Initiating, organising, and participating in stakeholder consultations, technical working groups, and industry dialogues Developing and delivering ISCC trainings on certification requirements for biogas and biomethane supply chains Engaging with regulators, competent authorities, and policymakers to support consistent interpretation and recognition of ISCC requirements Developing and updating system documents, audit procedures, and guidance materials for certified companies and auditors Contributing to the integrity program by supporting risk assessments, conducting plausibility checks, and evaluating certification patterns in biomethane markets   Additional duties can include:   Representing ISCC at external events, conferences, and industry forums Supporting the organisation of stakeholder meetings, webinars, and thematic workshops Contributing to communication materials such as newsletters, website content, and technical updates related to biomass fuels University degree in environmental sciences, agricultural sciences, biology, chemistry, or another relevant field At least 3 years of relevant professional experience , including experience in biogas and/or biomethane Strong understanding of anaerobic digestion, biomass fuel value chains, and related technologies (e.g. bioLNG) Good knowledge of sustainability certification systems and relevant EU legislation (e.g. EU RED, EU IR 2022/996 or RePowerEU) Familiarity with mass balance approaches, traceability systems, or GHG calculations is an asset Strong analytical skills and ability to work independently in a structured and strategic manner Very good communication and presentation skills in an international environment High IT affinity (MS Office, databases) and willingness to travel internationally Excellent English language skills (at least C1, written and spoken); additional languages are a plus We are an international and diverse team of passionate and experienced experts, joining forces for a sustainable future ! We believe that  our team is our core asset and we support our people as best we can.  To help you build your future and thrive with us, we offer:   Great Team Environment Various team events t