José Luis Guerrero Zafra

Software Engineer

• Act as deputy to the Operations Engineering Team Lead, taking ownership of technical and operational matters, coordinating priorities, resolving incidents, and collaborating directly with international clients.
• Designed and implemented an asynchronous, queue-based architecture using Amazon MQ/RabbitMQ to decouple payment microservices and enable reliable background processing, improving system scalability, resilience, and service independence.
• Led the migration of the platform's Flask microservices to FastAPI, while restructuring repositories and reducing technical debt through standardized project architecture and development practices.
• Established a branching and release workflow across microservice repositories and Jenkins pipelines, improving deployment management and enabling more reliable promotion of changes across development, staging, and production environments.
• Developed and maintained Visa and Mastercard transaction reconciliation processes, reconciling transaction data across authorization, clearing, and settlement flows for high-volume card operations.
• Built and integrated a RIA remittance REST API and a payroll processing pipeline with asynchronous callback confirmation, reconciliation, and fallback persistence. Python, Pydantic.
• Hardened card-transaction and scheduled services against race conditions and concurrency issues using Elasticsearch optimistic locking, timing-attack-safe comparisons, and global rate limiting.

Software Engineer

• Designed and developed the MVP of a SIEM platform with AI integration, integrating APIs of open source and private tools in the backend and a friendly frontend for non-technical users, aiming at a cost and performance balance for medium-sized companies. Docker, Wazuh, Suricata, OpenSearch, Watchguard EDR, ESET EDR, Google Gemini, React, TypeScript, Express, Node.js, MongoDB, MySQL.
• Developed a licensing platform based on Public-Key Cryptography Standards. Express, JWT.
• Standardization of diverse junior profiles, improving their knowledge in cybersecurity and autonomy working with the integrated platform tools.

Cybersecurity Consultant

• Conducted Common Criteria evaluations on EAL6 assurance level, focusing on test design and execution for secure critical systems, collaborating in an international environment.
• Planned and developed the creation of a knowledge base for the ICCC 2024 in Qatar using scraping techniques with Python.

Full Stack Developer

• Led the development of multiple projects for the restaurant sector using Java, Android, Node.js, and PL/SQL.
• Collaborated on the redesign and migration of a franchise's database architecture to a decentralized model, adapting their sales system to a web-based solution working with more than 90 endpoints across the country. MySQL, Redis, Docker.
• Integrated Redsys and Paytef payment gateways, including certification acquisition and compliance.
• Developed a hotel management solution for military use, deployed in a private and isolated environment using Android, Node.js, and SQLite.
• Led the integration of fiscal printers into third-party software for Italian clients, ensuring regulatory compliance.
• Managed AWS EC2 instances and on-premise Debian-based servers.

• Designed and developed an alternative unlock screen method for touch devices based on rhythms. Android, React, Node.js, Express, Docker.
• Studied the viability of the implementation, aiming for functional diversity of people and hostile environments.

Universidad de Jaén

Master's Degree in Computer Security · Present

Universidad de Jaén

University Degree in Computer Engineering · Present

IES Jándula

Higher Education Degree in MultiPlatform Application Development · 2013 - 2015

Programming

Backend

AWS

Databases & Search

DevOps & CI/CD

Observability

Architecture

Security

Testing & Quality

Other