Senior Java Backend Developer F/M/X at AccorCorpo

Accor Tech & Digital is the innovation and technological transformation lab of the world leader in hospitality.  Our teams, known as Heartists®, bring together the best of hospitality with the best of tech and digital. Our ambition is to provide our customers with personalized, memorable, and sustainable experiences.  Here, we create new ways to travel within each of our 5,500 hotels, connecting closely with our 100 million clients in 110 countries.   Here, we are at the heart of an incredible playground for technological transition and the design of digital products and services for our customers and hotel teams.  Here, your scope will know no boundaries;  So join us and dare to make an impact on the world!  Here is where your greatest challenge awaits you:   Within the Engineering team, you will join the API Customer, Loyalty & Messaging team, responsible for a strategic middleware layer that orchestrates all flows related to customer data, bookings, loyalty, and communications. This team plays a central role in the IT landscape, acting as an interface between core business systems and consumer-facing channels. It works on high-impact business topics, closely tied to the customer experience. You will report to the Tech Lead and collaborate closely with other Backend Developers, Product Owners, and business teams. Your Mission As a Senior Java Backend Developer, you will be responsible for: • Building APIs at the core of booking and order journeys • Developing and evolving scalable back-end services and APIs supporting critical customer journeys • Ensuring quality through testing, performance optimization, and maintainability in production • Structuring and exposing enterprise customer loyalty data • Designing robust APIs for B2B data aggregation and access • Working on data modeling and integration with existing systems • Contributing to the migration to our new central reservation system • Adapting and interfacing services with a new event-driven architecture • Ensuring service continuity and reliability of data flows • Evolving authentication mechanisms and account management • Implementing and improving secure authentication processes • Optimizing code performance, resilience, and quality through continuous improvement • Developing multi-channel messaging services (app, SMS, email) • Designing integrations with multiple providers and managing asynchronous flows • Building reliable services for notification and authentication journeys • Operating in a modern, stimulating technical environment • Working on API and microservices architectures in an agile context • Collaborating with cross-functional teams and contributing to technical decisions