I'm Jairzinho Guido Arreola, a senior software engineer based in San Jose, with 15+ years of building and scaling web applications and backend services using Python, Node.js, Java, and React. I own features end-to-end—from clarifying requirements and architecture to shipping clean, testable code and automating deployments to AWS/Azure with modern CI/CD practices. I’ve led e-commerce and fintech initiatives, designed microservices and APIs, built responsive UIs, implemented secure RBAC and OAuth2 flows, and mentored engineers while collaborating with product, risk, and compliance teams. I’m passionate about pragmatic problem solving, clear communication, and delivering high-availability platforms that handle real-world traffic and sensitive data.…I'm Jairzinho Guido Arreola, a senior software engineer based in San Jose, with 15+ years of building and scaling web applications and backend services using Python, Node.js, Java, and React. I own features end-to-end—from clarifying requirements and architecture to shipping clean, testable code and automating deployments to AWS/Azure with modern CI/CD practices. I’ve led e-commerce and fintech initiatives, designed microservices and APIs, built responsive UIs, implemented secure RBAC and OAuth2 flows, and mentored engineers while collaborating with product, risk, and compliance teams. I’m passionate about pragmatic problem solving, clear communication, and delivering high-availability platforms that handle real-world traffic and sensitive data.WWWW…