Senior Full Stack Engineer (AI Products)

HRvizer is partnering with a fast-growing European technology company that is redefining how knowledge-intensive industries leverage Artificial Intelligence. Our client has developed an advanced AI platform that automates complex business processes, allowing specialists to focus on strategic decision-making rather than repetitive manual work.Supported by leading investors and experiencing rapid international growth, the company is looking for a Senior Full Stack Engineer to stack and building products powered by modern AI technologies. What you'll doDesign and build production-grade web applications used daily by enterprise customers.Develop intuitive user interfaces for complex workflows in close collaboration with Product and Design teams.Build and improve AI-powered features, including LLM agents, evaluation frameworks, and supporting infrastructure.Develop scalable backend services, APIs, and data models capable of supporting high-growth, multi-tenant environments.Improve reliability, observability, and performance of long-running workflows.Participate in architectural decisions and contribute to technical direction across the platform.Work in a fast-moving engineering environment where ownership and execution are highly valued.Leverage modern AI tools to increase engineering productivity while maintaining high-quality standards.What we're looking forRequired:5+ years of experience building and shipping production web applications across the full stack.Minimum 2 years of experience working in an AI-native company where AI products or LLM-based solutions are at the core of the business.Strong experience with modern frontend development (React, TypeScript or similar).Solid backend engineering experience with Python or comparable technologies.Experience designing scalable APIs and data models for production systems.Practical understanding of LLMs, AI agents, prompt engineering, evaluation frameworks, and AI application architecture.Strong product mindset with the ability to take ownership from concept through production.Comfortable making architectural decisions and working in environments with a high degree of ambiguity.Excellent communication skills and fluency in English.Nice to haveExperience developing complex B2B SaaS products.Experience scaling distributed or multi-tenant systems.Background in highly regulated industries such as finance, healthcare, compliance, or audit.Technology StackReact, TypeScript, TailwindPythonPostgreSQLKafka, Redis, TemporalKubernetesGoogle Cloud Platform and AzureWhat our client offersCompetitive salary and equity package.Opportunity to shape a rapidly growing AI product from an early stage.High level of ownership and influence on technical decisions.Learning and development budget.Modern engineering culture focused on innovation, collaboration, and continuous improvement.Flexible vacation policy.A collaborative, on-site working environment in the heart of Berlin.If you're passionate about building AI-powered products and want to work on complex engineering challenges with a talented team, we'd love to hear from you.📩 Apply directly or contact HRvizer for a confidential discussion.