Senior Full Stack Engineer – Java/React (m/f/d)

We are modernizing several of SIXT’s business-critical core systems by replacing legacy vendor solutions with in-house platforms used across the whole company. We are now transitioning from external/legacy solutions into fully owned internal systems, and you will play a key role in redefining how these systems are designed, built, and operated. If you want to help shape the next generation of these platforms and contribute to a large-scale transformation program, apply now. YOUR ROLE AT SIXT You understand business processes behind systems and translate them into scalable in-house solutions, not just code implementations You contribute to the modernization of legacy systems into internal platforms as part of a broader transformation initiative You design and develop end-to-end distributed systems across backend (Java) and frontend (React/TypeScript) You work on event-driven architectures using Kafka and cloud-native technologies (AWS-based environments) You build and evolve APIs (including gRPC-based services) and UI components within a microservices ecosystem You act as a senior contributor in a governance-oriented team that enables engineering teams through standards, architecture and technical guidance YOUR SKILLS MATTER Technical Background Strong experience with Java, Spring Boot, React, and TypeScript in complex production environments Experience Proven background in designing and building cloud-native, distributed systems on AWS or similar cloud providers Domain Knowledge Deep understanding of microservices architecture, ideally with hexagonal or clean architecture principles Tools & Platforms Solid experience with event-driven systems and messaging technologies such as Kafka or RabbitMQ Practices Hands-on experience with modern engineering workflows and agentic tools such as Claude Code or Cursor, used intentionally to improve delivery quality and speed Background Experience in legacy system modernization, data migration, or transformation programs in enterprise environments is a plus WHAT WE OFFER A Global Tech Hub in Lisbon Join a thriving international tech community and work alongside engineers, product experts, and business teams who turn ideas into real impact. Our hubs at Factory Lisboa in Beato and ARTs Lisboa in Parque das Nações are where great tech gets built Learning & Knowledge Exchange Level up through regular events with internal and external speakers. We value curiosity, continuous learning, and open exchange – across teams, disciplines, and borders Flexible Work Setup Two office days a week, flexible hours, and modern spaces built for both deep focus and team collaboration – work the way that brings out your best Time Off & Wellbeing Enjoy 28 vacation days per year, an additional day off on your birthday, one volunteer day annually, and private health insurance that also covers your spouse and children free of charge Practical Everyday Benefits Get a yearly Coverflex allowance and a daily meal allowance to make everyday life a little easier SIXT Perks Get exclusive rates on all SIXT services, with special discounts extended to your family and friends. Because great perks are even better when you can share them About us: We are a globally leading mobility service provider with a revenue of €4.00 billion and around 9,000 employees worldwide. Our mobility platform ONE combines our products SIXT rent (car rental), SIXT share (car sharing), SIXT ride (taxi, ride, and chauffeur services), and SIXT+ (car subscription), giving our customers access to our fleet of 350,000 vehicles, the services of 4,000 cooperation partners, and around 5 million drivers worldwide. Together with our franchise partners, we are present in more than 110 countries at 2,000 rental stations. At SIXT, top-tier customer experience and outstanding customer service are our highest priorities. We believe in true entrepreneurship and long-term stability and align our corporate strategy with foresight. Get started with us and apply now!