Senior Full-Stack Developer (Frontend-focused)Contract: Long-term mission - Freelancer preferedLocation: Remote (Spain-based)We're looking for an experienced frontend-leaning Full-Stack Developer to join ourinternational technology team building financial and fintech products. You'll spend mostof your time crafting polished, scalable web interfaces, while being comfortable reachinginto the backend to deliver a feature end to end. This role suits someone proactive,detail-oriented, and product-minded.Your responsibilities:- Design, build, and maintain high-performance React + TypeScript web applications, from shared UI components to full product screens.- Own the front-end: state management, forms and validation, internationalization (i18n), and integration with REST/OpenAPI backends and auth (Keycloak/JWT).- Contribute to and extend a shared component library used across multiple web apps - keeping things reusable, consistent, and clean.- Reach into Java / Spring Boot microservices when a feature needs it (new endpoints, DTOs, wiring), collaborating closely with the backend team.- Collaborate with cross-functional teams (architecture, product, compliance) and contribute to technical decisions and continuous improvement.Your profile:- 5+ years as a full-stack developer, with a clear frontend focus.- Strong expertise in JavaScript/TypeScript and React (state management, component libraries, testing, i18n). Vue/Angular experience welcome, but React is our stack.- Solid experience consuming and integrating REST APIs (OpenAPI/generated clients; GraphQL a plus).- Comfortable contributing to a Java / Spring Boot backend (or a strong willingness to ramp up) - you don't need to be a backend specialist, but you shouldn't be blocked by it.- Familiarity with PostgreSQL, containerized services (Docker), CI/CD (Jenkins), and AWS.- Flutter/Dart mobile experience is a plus (we ship native apps too).- Background in financial services or fintech is a strong plus; cryptocurrency/blockchain knowledge is a significant plus.- Excellent English communication skills.- Based in Spain and available to start Immediatly.Why join us?- Work on cutting-edge financial technology - payments, KYC/KYB, cards, wallets, and crypto.- International, collaborative, agile culture.- Long-term remote engagement with flexible work arrangements.If you enjoy building great user-facing products at the intersection of finance andtechnology - and aren't afraid to follow a feature all the way to the API - we'd love to hear from you.

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Senior Full-Stack Developer (Frontend-focused) Remote (Spain-Based)