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 e We 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 s Design, 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 Dev Ops and CI/CD practices to ensure reliable and efficient deployments. Required Experienc e Proven 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 Dev Ops and CI/C D practices. Retail & Omnichannel Experienc e The ideal candidate should have experience with : Integration of e-commerce platforms with physical retail operations. Omnichannel processes such as : Click & Collec t Ship-from-Stor e In-store Return s Multi-channel inventory and fulfillment management. Concepts such as : BOPIS (Buy Online, Pick Up In Store )Endless Aisl e Unified Inventor y Nice to Hav e Experience with Fluent OM S. Strong focus on customer experience across both digital and physical channels .