Senior Software Engineer

Description

Summary: PagoNxt Payments seeks a Senior Software Engineer to design, implement, and lead architectural decisions for scalable financial solutions, leveraging AI-powered development tools. Highlights: 1. Build impactful solutions and grow with real development opportunities 2. Thrive in a culture valuing well-being, inclusion, and clarity 3. Combine flexibility, autonomy, and global collaboration **PagoNxt Payments** **\|** **✨** **Your talent drives our future** ------------------------------------------------------------------- **PagoNxt Payments** is Santander Group's global payments platform, focused on providing tailored financial infrastructure for companies, banks, and fintechs — both inside and outside the Santander ecosystem. With operations in over 10 countries, our mission is clear: **to simplify payments and empower businesses** through secure, flexible, data\-driven technology. We operate on a cloud\-native architecture designed to scale and adapt to the needs of global organizations. Our platform supports international transactions, FX, multi\-currency accounts, regulatory compliance, and fraud prevention — all under a unified approach. **PagoNxt Payments** combines the agility of a fintech with the reliability of a global bank. With teams across **Spain, Brazil, Mexico, Portugal, the UK, and Germany**, we are building the future of payments at global scale. **✨** **If you want to be part of the next generation of financial solutions — this is the place.** **Imagine your future. Care for your career. Simplify your journey.** This means you'll have the opportunity to build impactful solutions, grow with real development opportunities, and thrive in a culture that values well\-being, inclusion, and clarity. We combine flexibility, autonomy, and global collaboration — so you can focus on what matters, connect with purpose, and shape what's next. You'll find space to grow, real opportunities to lead, and a culture where everyone belongs and contributes. **Are you ready to be a Nxter?** **What you'll do** As a Senior Software Engineer, you will: * Design and implement new functionalities based on requirements / scenarios captured in user stories, ensuring scalability and maintainability * Lead technical ownership of squad products throughout their lifecycle, from development to production, including incident management and performance optimization * Drive architectural and design decisions, conduct code reviews, and mentor junior team members on best practices * Define and implement comprehensive automated testing strategies, including unit, integration, and end\-to\-end tests * Leverage AI\-powered development tools (e.g., Devin, GitHub Copilot) to accelerate development workflows, automate repetitive tasks, and improve code quality * Evaluate, integrate, and champion AI/ML\-assisted coding solutions within the team to drive engineering productivity and innovation * Contribute to the definition of technical standards, coding guidelines, and architectural patterns for the squad **✅** **What we're looking for** 5\+ years of hands\-on experience developing microservices in Java Spring Boot in production environments * Strong knowledge of REST API design, implementation, and versioning best practices * Proven experience working with Agile/Scrum methodologies in cross\-functional teams * Excellent English proficiency (B2\+ or higher), both written and verbal * Strong leadership mindset: proactive, independent, with excellent teamwork and mentoring skills. Ability to anticipate and mitigate technical risks * Solid ability to understand, design, and optimize relational data models * Advanced experience with SQL, query optimization, and database performance tuning * Experience with messaging queues (Kafka preferred) and batch processing architectures * Demonstrated experience using AI\-assisted development tools (GitHub Copilot, ChatGPT, Cursor, or similar) to enhance coding productivity * Experience with Devin (by Cognition AI) or equivalent AI software engineering agents is a strong plus * Track record of integrating AI/ML capabilities into development workflows and CI/CD pipelines **EDUCATION****:** * Degree in: Systems/Computing Engineering, Computer Science, or similar. Master's degree is a plus. **✅Technical skills** * Expert\-level experience with Java (Java 11\+, ideally Java 17\+) and Spring framework (Spring Boot, Spring Cloud, Spring Security) * Deep expertise in Microservices architectures, API Design, REST APIs, and event\-driven systems * Solid understanding of Cloud computing platforms (Azure preferred: EC2, ECS, Lambda, S3, RDS, SQS) * Strong experience working in Agile environments with CI/CD pipelines * Advanced testing automation experience (JUnit, Mockito, integration testing, contract testing) * Experience with AI\-powered development tools: GitHub Copilot, Devin (Cognition AI) or similar AI coding assistants + Nice to have: + Kafka / Event\-driven architectures + PostgreSQL / Advanced SQL + ELK stack / Observability tools (Grafana, Prometheus) * Kubernetes, Docker, and/or Pivotal Cloud Foundry * Experience building or integrating AI/ML models into applications * Prompt engineering and LLM integration experience **What we offer** Medical insurance Dental insurance Wellhub Life insurance Annual healthcare Transportation allowance Meal voucher/food voucher Annual bonus Access to self\-development programmes Hybrid Collaborative environment: Successful candidate must be prepared to work 60% on site **Next step** Apply and if you know someone who might be looking for this opportunity, share it.