Senior Software Engineer - Fullstack (m/f/d)

JOIN VOYFAI, A FAST-GROWING SERIES A STARTUP SHAPING THE FUTURE OF LOGISTICS AND TECHNOLOGY ACROSS EUROPE. Headquartered in Berlin, we operate at the center of a broader group of companies active across several European markets. This is a unique opportunity to take ownership from day one, drive meaningful impact and grow within a dynamic, fast-paced environment. Whether you're shaping processes, building strategies or leading initiatives, your contributions will directly influence the success of Voyfai and the companies we support. If you're passionate about building from scratch and excited to be part of a company on the rise, we'd love to hear from you. YOUR ROLE We are seeking an experienced Senior Software Engineer (m/f/d) to play a key role in building the core infrastructure of our logistics platform. In this role, you will work closely with AI engineers and product stakeholders to define system architecture, integrate with transport management systems, and develop customer-facing features powered by large language models. Your work will be critical in shaping our engineering practices and establishing a scalable foundation for future product development over the next 12 months. KEY RESPONSIBILITIES: - Design and develop scalable software solutions with a strong focus on system architecture and clean code - Build and optimize integrations with transport management systems and third-party logistics platforms - Collaborate with AI engineers to deliver customer-facing features powered by large language models - Improve system reliability, maintainability and scalability by addressing technical debt and evolving the tech stack - Work with PostgreSQL to ensure data consistency, integrity and performance - Leverage cloud platforms such as AWS or GCP to support infrastructure and deployment - Contribute to DevOps and CI/CD practices to improve release speed and operational stability - Occasionally support customers directly, helping translate their needs into product