Full Stack Engineer - Java/React (m/f/d)

Revenue Management at SIXT depends on more than pricing, it requires reliable systems connecting planning, commercial rules, internal platforms, and external partners. As a Full Stack Engineer in our Revenue Management technology team, you will build and evolve several business-critical products. Your work may span Strategic Fleet Planning tools, integrations with third-party systems, tax configuration services, and new solutions for emerging business needs. You will own features end to end, from intuitive React interfaces to Java services running in the cloud. Working closely with Product, Data Science, business experts, and other engineering teams, you will turn complex requirements into reliable software that creates measurable operational and commercial value. If you enjoy moving between domains, understanding the business behind the technology, and taking responsibility from problem definition to production, join us in Lisbon. YOUR ROLE AT SIXT You own features end to end, challenging unclear requirements, defining acceptance criteria, then implementing, deploying, monitoring, and validating in production instead of waiting for a detailed spec You build and evolve systems across multiple Revenue Management domains, including fleet-planning applications, third-party integrations, and tax configuration You develop intuitive React and TypeScript experiences backed by reliable Java and Spring Boot services in a cloud-native, distributed, event-driven architecture that integrates safely with internal and external systems You collaborate with Product, Data Science, business experts, and engineering teams to turn complex processes into clear technical solutions You use modern AI engineering tools to accelerate implementation, testing, and root-cause analysis while staying accountable for the correctness of what you ship You make quality structural through automated testing, observability, code reviews, maintainable documentation and help shape technical direction acro