About Moisés
Senior Full Stack Engineer with 5+ years of experience building scalable web applications, backend systems and SaaS platforms.
I specialize in Java, Spring Boot, React, Node.js and TypeScript, working across frontend, backend and database architecture.
I have experience developing REST APIs, business management platforms, internal tools and fullstack applications with end-to-end ownership.
Throughout my career, I have collaborated closely with clients and teams to define technical solutions, software architecture decisions and scalable application designs.
I also have a specialization in Cybersecurity, applying secure development practices such as JWT authentication, OWASP principles, API security and backend security best practices.
Currently, I am expanding my expertise in Software Architecture, Domain-Driven Design (DDD), Event-Driven Architecture, Microservices, Apache Kafka and AWS Cloud technologies to design scalable, resilient and modern distributed systems.
Spanish
Native or bilingual
English
Conversational
Remote only
Primarily works remotely
Experience
- Katatek GroupSenior Software Engineer - Instituto Nacional de la Seguridad Social (INSS)SOFTWARE PUBLISHINGMarch 2026 - Today (4 months)Madrid, Spain• • Leading the end-to-end development of a SaaS application for product management, quotations and exchange rates.• • Designing and implementing scalable backend services using Node.js, handling business logic and REST APIs.• • Developing modern frontend applications using React, TypeScript and Vite, focused on performance and maintainability.• • Designing scalable and maintainable architecture to support product growth.• • Implementing authentication and authorization using JWT, along with input validation and sanitisation to prevent vulnerabilities such as XSS and SQL injection.• • Acting as the lead engineer, owning architecture and key product decisions.
- Grupo Tecdata EngineeringSenior Software Engineer - Santander BankNovember 2025 - February 2026 (3 months)Madrid, Spain• • Led the migration and modernisation of legacy applications from PHP to Python (Flask) and Angular, improving system performance and maintainability.• • Designed and implemented secure REST APIs, including JWT-based authentication and protection against OWASP vulnerabilities (XSS, SQL injection) using input validation and parameterised queries.• • Integrated internal banking systems through scalable API architectures, improving interoperability and system reliability.• • Worked across the full development lifecycle (analysis, design, implementation, testing and deployment) in enterprise environments.• • Improved system reliability, performance and security in high-demand banking environments.
- PUE ControlFull Stack DeveloperENERGY AND UTILITIESMay 2022 - October 2025 (3 years and 5 months)Madrid, Spain• • Developed and maintained renewable energy platforms using Java (Spring Boot), Python and MariaDB.• • Built and optimised REST APIs, improving system performance and scalability.• • Implemented monitoring and performance optimisation using Grafana and Prometheus.• • Worked in Agile environments using Git and Docker.
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Education
- Master of Cybersecurity2026Master of Cybersecurity
- Higher Vocational Training in Multiplatform Application Development (DAM)2021Higher Vocational Training in Multiplatform Application Development (DAM)