Mid-Senior Level | Engineering - Integrations & Product

About the Role

We'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 AWS
- Help keep the portal scalable, modular, and brandable as new clients and integrations come on board

What 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 documentation

Nice 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

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