Senior Java Backend Developer – Omnichannel Retail Location: Lisbon, Portugal (Hybrid – 3 days onsite per week) Start Date: Immediate Contract: Initial 6-month contract with a strong possibility of extension About the Rol eWe are looking for an experienced Senior Java Backend Develope r to join a strategic omnichannel retail transformation project. You will play a key role in designing and developing integrations between e-commerce platforms and physical retail operations, helping deliver seamless customer experiences across digital and in-store channels Key Responsibilitie sDesign, develop, and maintain scalable backend services using modern Java technologies .Build and support integrations between e-commerce platforms, OMS solutions, and retail systems .Develop and maintain microservices-based architectures .Create and optimize RESTful APIs for internal and external integrations .Collaborate with business and technical teams to deliver omnichannel retail capabilities .Contribute to DevOps and CI/CD practices to ensure reliable and efficient deployments Required Experienc eProven experience with Java 17 + in production environments .Strong hands-on experience with Spring Boo t and the broader Spring ecosystem .Experience developing and supporting Microservices Architecture s .Solid knowledge of Docke r and Kubernete s .Experience designing and implementing RESTful API s .Exposure to DevOps and CI/C D practices Retail & Omnichannel Experienc eThe ideal candidate should have experience with :Integration of e-commerce platforms with physical retail operations .Omnichannel processes such as :Click & Collec tShip-from-Stor eIn-store Return sMulti-channel inventory and fulfillment management .Concepts such as :BOPIS (Buy Online, Pick Up In Store )Endless Aisl eUnified Inventor yNice to Hav eExperience with Fluent OM S .Strong focus on customer experience across both digital and physical channels .