Senior Full Stack Developer – AI Product

• Take ownership of key parts of the AI and software architecture
• Design and develop scalable AI agent systems, including multi-step reasoning, decision pipelines, and tool use
• Build and improve LLM-based systems, including prompting, tooling, memory, and orchestration
• Ensure the reliability and quality of AI outputs through evaluation, monitoring, and guardrails
• Build observability and evaluation frameworks, including regression testing for AI systems
• Work closely with Product and Business teams to turn operational problems into scalable technical solutions
• Make technical decisions with long-term impact on architecture, technology stack, and scalability
• Ship solutions used by customers
• Develop CERA AI, an AI agent that automates real logistics processes such as processing incoming emails, negotiating prices, and transferring transport orders

• 6–8+ years of experience in software engineering
• Ideally, hands-on experience building AI/LLM-based products or systems
• Strong Python skills, ideally with Django or a comparable framework
• Experience working with LLM APIs such as OpenAI, Claude, or similar platforms
• Understanding of AI system design beyond simply integrating an API
• Experience with evaluation methods, monitoring, and observability
• Ability to think in systems rather than individual features
• Strong understanding of the trade-offs between speed, reliability, and quality
• High level of ownership and ability to work independently
• A pragmatic mindset focused on building, shipping, and improving real products
• Professional working proficiency in English

• Work 100% remotely from Croatia
• No relocation to Germany required
• Join a German tech company
• International team
• High technical ownership and room to shape the architecture, technology, and future of the product
• Impact over bureaucracy
• Long-term collaboration