Mid–Senior Level | Engineering – Integrations & ProductAbout the RoleWe're looking for a mid-to-senior fullstack developer to help build and evolve this platform end to end — from the Java/Spring backend services to the React-based frontend — while working closely with the teams responsible for third-party integrations, platform infrastructure, and the wider product.What You'll Do- Design, build, and maintain features across the platform's stack, spanning multiple regional environments- Develop backend services in Java 17 with Maven, and frontend components in React with Yarn- Work with PostgreSQL and MongoDB (Atlas Database) to model, query, and optimise account and document data- Integrate with regional identity providers (Keycloak) for authentication, and with internal data and document-archive services for account and document data- Contribute to the work needed for integration with a third-party back-office platform, including required user-management functionality, and support both pull and push data flows- Write clean, tested, well-documented code, and take part actively in code reviews- Collaborate with Product, QA, and DevOps within an agile setup — sprint planning,



refinement, and retros- Help troubleshoot issues across the stack, including occasional 2nd-line support and root-cause analysis- Contribute to CI/CD pipelines and deployments on AWSHelp keep the portal scalable, modular, and brandable as new clients and integrations come on boardWhat We're Looking For- 4–7 years of professional experience as a fullstack developer- Hands-on backend experience with Java 17 and Maven- Hands-on frontend experience with React and Yarn- Practical experience with both a relational database (PostgreSQL) and a document database (MongoDB)- Comfortable working across the stack and owning a feature from API to UI- Good communication skills and comfort working with distributed, cross-functional teams- A pragmatic, quality-conscious approach to code, testing, and documentationNice to Have- Experience with AWS (ECS, Secrets Manager, VPN/networking basics)- Familiarity with SSO/OIDC and Keycloak- Exposure to B2B SaaS platforms, client portals, or back-office integration domains#J-18808-Ljbffr

📌 Full Stack Engineer (Madrid)
🏢 Socium - Teams Done Differently
📍 Madrid