Senior Full-Stack Developer (m/w/d) - TypeScript / Next.js

We are currently developing a B2B SaaS product in stealth mode. The technical foundation is in place, the first core product functions have already been developed, and now the most exciting phase begins for us: building a market-ready product from a strong foundation that we can then scale. To this end, we are looking for a Senior Full-Stack Product Engineer (m/w/d) who doesn't just tick off requirements, but takes on technical and product responsibility. You will work directly with the founder, have a major influence on the product and architecture, and accompany features from the initial idea to productive deployment. Responsibilities: Further development of our existing B2B SaaS platform in frontend and backend; Conceptualization and implementation of new features from the data structure to the user interface; Further development of complex, interactive web interfaces; Development and integration of AI-supported functions and workflows; Conceptualization and integration of external APIs and services; Further development of our data models and backend architecture; Ensuring code quality through testing, reviews, and a clean architecture; Improving performance, UX, security, and scalability; Technical evaluation of new product ideas and independent development of proposed solutions; Active co-shaping of our future product and technology roadmap. Qualifications: Several years of experience in developing modern web applications or SaaS products; Sound experience in modern tech stacks...