Job Summary: We are seeking a Senior Full Stack Developer with solid experience and strong technical vision to join a small development team, actively participating in technical and product decisions. Key Highlights: 1. Actively participate in technical and product decisions. 2. High-performance technical environment with experienced professionals. 3. Collaborative and participatory work culture. **Description:** ---------------- Mercaconsult, a talent acquisition consultancy, is looking for a Senior Full Stack Developer with solid experience and technical vision for one of our technology-sector clients. **The Challenge** You will join a small development team, working directly with the CTO and actively participating in technical and product decisions. We seek a senior profile who wishes to go beyond pure development and is interested in: * Participating in architecture decisions. * Designing scalable and efficient solutions. * Proposing better techniques with real impact. * Closely collaborating with business and product teams. This is not a role focused solely on task execution, but rather on contributing judgment and experience. **What does the company offer?** * High-performance technical environment with experienced professionals. * Multidisciplinary team focused on product, development, and analytics. * Collaborative and participatory work culture. * Continuous innovation in every new solution. * Ongoing training. * Established agile methodologies (Scrum, sprints, Lean). * Offices in Sabadell with a hybrid work model (2 days of remote work per week). * Direct impact on the product and on the company’s technological evolution. **Requirements:** --------------- * **Profile we are seeking:** Beyond technical knowledge, we seek a person who: * Has strong communication skills. * Applies common sense when designing solutions. * Is proactive and solution-oriented. * Enjoys teamwork and sharing ideas. * Is autonomous, participatory, and results-driven. We value profiles that not only identify problems but also propose solutions and improvements. **Technical Requirements** * Over 8 years of software development experience. **Backend** * PHP * Python **Frontend** * Advanced JavaScript * Experience with React, Angular or Vue * TypeScript **Architecture and Data:** * REST API design. * MySQL and SQL Server (including optimization). **Infrastructure and Quality:** * Clean Code * Unit testing * Docker * CI/CD **Cloud:** * Experience with AWS, Google Cloud or Azure **Especially valued:** * Knowledge of .NET * Non-relational databases * Sysadmin experience * Proficiency with Atlassian tools (JIRA, Bitbucket) **What type of professional fits best?** A person with a product mindset, who understands the business impact of technical decisions and wants to be part of a team where ideas are debated, solutions are built collectively, and technical judgment is valued.