Full Stack Developer (Java/React) - AI Decisioning Platform - Frankfurt - €75–85K

Full Stack Developer (Java/React) - AI Decisioning Platform - Frankfurt - €75–85K If you want to build the intelligence layer that will shape how digital products make decisions, this is one of the few places doing it right now. This company has created an AI-decisioning platform used by leading travel brands to take hundreds of automated decisions every second. Their proprietary Massive Relational Knowledge Network, trained on over 1.7 billion user journeys, interprets behaviour, profiles products and users, and delivers real-time scoring that drives smarter, faster, more relevant experiences. It’s not simple personalisation - it’s AI-powered decision automation at scale.This is the direction all digital channels are heading over the next decade. They’re now hiring a Full Stack Developer (Java + TypeScript/React) to help design and operate the systems that turn behavioural signals into real-time rankings, recommendations, and adaptive user experiences - end to end. What you'll do You’ll be building the core intelligence of a high-speed AI platform: Build features across the full stack: Java services and TypeScript/React UIsIntegrate Python-backed ML models with the Applied AI teamWork with real-time behavioural data: streaming, aggregating, exposing analyticsImprove quality through strong testing practices and clean API contractsMeet tight performance goals and operate what you build (caching, batching, tracing, metrics, logs)Shape architecture, tooling, and the overall direction of the product You bring5+ years building production systems (backend + frontend)Expertise in Java 17+ (Spring Boot or Quarkus)Strong TypeScript + modern ReactUnderstanding of distributed systems and web performance Why this role is specialStartup speed and ownership, backed by a stable parent travel-tech groupFlat hierarchies and high trust — no micromanagementArchitecturally interesting work with cutting-edge toolsYour ideas directly influence the productWork on tech that actually impacts millions of users in real time Apply now to avoid missing out.