At Circonomit, we’re dedicated to revolutionising how organisations perceive and manage their resources. We are committed to eliminating adverse outcomes resulting from hidden interdependencies, enabling organizations to operate more efficiently and sustainably. Our mission is to build the strategic twin of organizations. We are seeking a Software Engineer working side by side with our CTO, taking on full-stack responsibility. In this role, you will take key ownership of building intuitive, powerful tech that makes system-level interdependencies usable and scalable. As a key contributor, you will split critical work in code, architecture, and deployment with Erik. If you are passionate about using data to drive strategic decision-making and thrive in a fast-paced, nerdy environment, we would love to hear from you! Responsibilities Design and develop core components alongside the CTO of the modelling toolbox and its computation engine in the full stack Own a proactive role in drafting and implementing software architecture, computational logic, and scalable infrastructure Model graphs and ontologies to capture complex relationships and build structures that translate abstract domains into clear data models Write clean, maintainable, and efficient code on top of what AI cannot deliver Prototype fast and smart, testing, learning, and delivering between AI and UX Participate in code reviews and ensure adherence to best practices Troubleshoot and debug system issues to ensure high availability and performance Collaborate with the founding team to consistently translate the big picture into outcomes Requirements 5 years of experience in software development, preferably in a founding or startup environment Strong proficiency in programming languages such as TypeScript and SQL Solid experience with frameworks such as Solid.js and LangChain Experience with graph databases and ontology modeling Experience with cloud-based technologies and architecture Solid experience in the abilities and the boundaries of AI, the use of language models, prompt engineering, and retrieval-augmented generation is a big plus Advanced understanding of data structures and algorithms Bachelor's degree in Computer Science or a related field is appreciated You must speak English at level C1 or higher You must speak German at level C1 or higher You already live or are willing to relocate to Cologne, Germany Benefits We are an early-stage organisation that values speed of development without cutting corners on core product quality. We are in the game to build scalable and maintainable software and seek engineers, not just programmers, who push the edge of tech between language models and math and can translate complex data into simple, coherent computation flows. Everyone should have skin in the game, which is why we offer both competitive salaries and equity packages. Ownership and authority in decision-making are not only possible but required. We love hard work and sports, so that benefit is also covered. Can't wait to chat! “Hustle the day, analyse at night, reinforce something outstanding” Period. Erik & Dana