Cesar Evaristo Quintana Hernandez

Remediated backend execution bottlenecks by optimizing MySQL schemas and ORM query paths. Implemented standardized REST endpoints with payload validation, error handling, and unit test coverage for third-party integrations. Collaborated with U.S.-based solution architects and QA engineers across remote staging environments, working within Git-based development workflows.

Architected and scaled Java/Spring Boot and Python microservices for high-volume transactional platforms. Optimized MySQL query performance and improved data availability. Built responsive merchant and operator web experiences with React/TypeScript and integrated live event streams via Google Pub/Sub and Kafka. Engineered POS event workflows including payment/tip authorization routines and order-handling integrations with automated error handling and logging. Accelerated delivery using AI-assisted coding tools (GitHub Copilot) and improved release quality with Cypress test suites in CI/CD pipelines.

Developed and maintained fault-tolerant REST APIs, transactional logging scripts, and payment gateway integrations using Java and C# alongside relational databases. Configured caching strategies and managed connection pooling for MySQL clusters to support peak-hour traffic. Implemented secure transaction workflows using OAuth and JWT and followed strict financial transaction logging standards.