[Back to all jobs](/?language=en) # (Senior) Software Engineer - Full Stack Köln, Hybrid Full-time Permanent employee 60,000 - 70,000 € per year ## Your tasks **ISCC – International Sustainability and Carbon Certification** is one of the leading certification systems for sustainability, traceability and the reduction of greenhouse gas emissions. As part of our continued growth, we are focussing on the further development of our Transaction Database and expanding our IT & Technology team. To support this strategic step, we are looking forward to welcoming you as**Software Engineer – Full Stack** to work closely with our internal stakeholders and take responsibility for building, integrating and continuously improving our application landscape. If you are passionate about building high-quality software with real-world impact and would like to contribute to a sustainability-driven and culturally certified **Great Place to Work®**company, we look forward to your application! Your main duties will be: * Design, development, and maintenance of full-stack applications, web services and REST APIs * Implementation and integration of ISCC applications with external systems and web services * Automation and optimization of workflows and data-driven processes * Preparation, analysis, and curation of business-relevant data * Creation and maintenance of clear technical documentation in line with internal standards * Translation of business requirements into technical solutions, including refining and implementing user stories * Ensuring consistency, integrability and data security across applications * Active contribution to cross-functional projects and continuous improvement initiatives * Close collaboration within the IT team, reporting to the Senior IT Project Manager & Team Lead ## Your profile Professional background * **University degree in computer science, computer engineering, or a comparable field** * **At least 5 years of professional experience** as a full-stack software engineer or in a similar role * Experience in creating structured technical documentation (e.g. OpenAPI for REST APIs, or for ISMS or comparable standards) * Strong understanding of secure software development; knowledge of ISO 27001 is a strong plus Technical skills * **Strong proficiency in Go (Golang), JavaScript/TypeScript and Python** (additional languages such as Java or C# are a plus) * Experience with modern frontend frameworks (e.g. React, Vue.js) and basic styling solutions * Solid backend experience and familiarity with common architectural patterns for monolithic (e.g. multi-tier, hexagonal) as well as distributed microservices setups with high availability, failover modes, caching, message buses, etc. * Experience with various database system types: relational-, document-, and graph-based * Confident use of Git-based workflows and CI/CD pipelines; experience with Gitlab is a plus * Experience with containerised environments (Docker; Kubernetes is a plus) * Familiarity with cloud-native environments (Azure, GCP, AWS is a plus) * Experience working in agile environments (Scrum) Personal competencies * General aptitude to learn new programming languages * Excellent analytical and problem-solving skills with a structured and detail-oriented mindset * Strong communication and collaboration skills in interdisciplinary and intercultural teams * Service-oriented mindset combined with a strong sense of responsibility and integrity * **Excellent English language skills (at least C1, written and spoken);** German language skills are a plus * High level of independence, reliability, and initiative ## Why us? 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 throughout the year (Celebr