Job Summary: We are looking for a Senior Backend Developer to design and develop financial APIs, optimize critical systems, and lead projects with a strong focus on quality, automation, and AI. Key Highlights: 1. Complex and high-impact international fintech projects 2. A technical environment focused on excellence and automation 3. Opportunity to assume architecture and technical leadership responsibilities **About Us** We are a leading technology company in international financial APIs, connecting with multiple banking institutions. We combine innovation, code quality, and AI-driven automation to build critical, secure, and scalable solutions for the financial sector. Our team works with advanced technologies and places strong emphasis on automation, testing, and technical excellence. **What We’re Looking For** We seek a Senior Backend Developer with extensive experience in PHP and complex financial systems, capable of making architectural decisions and leading projects. We value deep technical expertise, strategic thinking, and passion for code quality and efficiency. **Responsibilities** * Understand and contribute to the design and development of our multi-institutional financial API. * Define scalable, secure, and highly available backend architectures. * Integrate international banking APIs and develop robust connectors for new institutions. * Optimize systems in critical environments. * Implement test automation, deployment automation, and AI-powered tools to improve productivity and quality. * Mentor junior and mid-level developers, promoting good coding practices, documentation, and processes. * Participate in strategic decisions regarding infrastructure, development standards, and technology selection. * Ensure the robustness and reliability of systems handling sensitive financial data. **Essential Technical Requirements** * **Advanced PHP**: complex backend development and optimization of existing systems. * **MySQL**: design and optimization of critical databases and complex transactions. * **REST APIs**: advanced architecture, integration, and documentation. * **Authentication and security systems**: OAuth, JWT, RSA, 2FA. * **Experience with financial data**: understanding of investment products, debt instruments, multi-currency operations, and compliance. * **Complex data formats**: JSON, XML, CSV, PDF. * **Version control**: professional-level Git, including complex workflows. * **Advanced testing**: PHPUnit, TDD, mocks, and deep debugging. **Desirable Requirements** * Fluent English and Spanish. * Experience in **AI and automation** applied to development and testing. * In-depth knowledge of financial products: accounts, cards, loans, portfolios. * Ability to work onsite in **Alcorcón (Madrid)**. **What We Particularly Value** * **Technical leadership and mentoring** of other developers. * A mindset of **automation and efficiency**, without compromising quality. * Experience in **mission-critical financial projects**, where precision is essential. * Ability to quickly learn and apply new technologies. * Extreme attention to detail and code quality. **What We Offer** * **Competitive salary up to €50,000 gross per year**, based on experience and level of responsibility. * **Onsite work in Alcorcón (Madrid)**. * Continuous training in **emerging technologies and AI tools**. * **Complex and high-impact international fintech projects**. * A highly skilled technical environment focused on **excellence and automation**. * Opportunity to assume responsibilities in **architecture, technical leadership, and mentoring**. Are you interested in joining a team that combines financial technology with AI and automation? Please submit your CV detailing your experience in PHP, APIs, and projects where you have demonstrated organizational capability. Job Type: Full-time, Permanent contract Salary: Up to €50,000.00 per year Benefits: * Optional remote work Experience: * PHP: 5 years (Required) * APIs: 4 years (Required) Language: * English (Required) Work Location: Hybrid remote work in 28921 Alcorcón, Madrid province