Job Summary: At Septeo, we are looking for a Senior Full Stack Developer with a solid technical foundation in Node.js or Delphi to evolve and modernize a diverse and complex technological ecosystem. Key Highlights: 1. Main backend development in Node.js or Delphi 2. Participation in the evolution and refactoring of existing systems 3. Real opportunity for technical growth in a high-quality environment **Company Description** At Septeo, we are seeking a **Senior Full Stack Developer** with a solid technical foundation in Node.js or Delphi who wants to participate in the evolution and modernization of a diverse technological ecosystem. Our environment combines legacy applications and current web solutions. We seek a candidate with strong technical judgment, capable of adapting to different programming languages and actively contributing to structural system improvements. **Job Description** **What will you do?** * Backend development primarily in **Node.js or Delphi** (based on experience). * Resolution of critical production incidents (Level N3). * Evolution and refactoring of existing systems. * Participation in progressive migrations toward more maintainable architectures. * Development of new features. * Performance optimization and SQL query tuning. * Participation in code reviews and continuous improvement. **Requirements** * Solid experience in **Node.js or Delphi** * Proficiency in Object-Oriented Programming * Experience with relational databases (MySQL or others) * Ability to work with complex and heterogeneous systems * Structured mindset oriented toward best practices **Highly Valued** * Experience in legacy environments * Experience in system refactoring or modernization * Experience working with multiple programming languages throughout your career * Interest in learning technologies such as WinDev **Additional Information** **What we offer** * Permanent contract and job stability * 100% remote work from Spain * Stable product-based project (not consulting) * Technical environment that values quality and continuous improvement * Real opportunity for technical growth * Competitive salary commensurate with your experience * Collaborative, dynamic, and technology-driven work environment * Central office with modern facilities and excellent location