**Description:** ---------------- We at **PROMAN GROUP** are seeking a Senior Front-end Developer to strengthen and complete the Digital Department for a company located in Valladolid. We are looking for a candidate with experience in developing advanced user interfaces—both web-based (React) and desktop (PyQt)—who possesses a strong design sensibility, adheres to best practices, and understands software architecture. **Candidate’s competencies:** Commitment to and involvement in projects. Analytical ability and critical thinking. Strong communication skills and ability to work effectively in teams. Proactivity in proposing improvements and learning new technologies. Quality- and user experience-oriented mindset. **Key responsibilities:** Develop and maintain user interfaces using React and PyQt, applying clean and efficient design patterns. Participate in the technical and functional definition of projects, contributing ideas and improvement proposals. Create and maintain technical documentation for developed solutions. Collaborate on support, maintenance, and incident resolution tasks as required. Work closely with other teams—including backend, design, product, industrial, etc. **What we offer:** Intensive morning working hours, Monday through Friday. Job stability. Direct employment contract with the company. Competitive salary commensurate with experience and profile. **If you’re eager to grow within a major enterprise, this is your opportunity!** **Requirements:** --------------- Solid experience with PyQt5/PyQt6 or PySide2/6. Experience with React and modern TypeScript/JavaScript. Proficiency in Python (data structures, object-oriented programming). Experience in UX/UI design (Figma, Uizard, Mockplus, etc.). Experience integrating REST APIs. Knowledge of real-time communication protocols: WebSockets or MQTT. Familiarity with JSON and configuration files (YAML/JSON). Ability to develop robust, efficient, and stable interfaces.