Efrain Guerrero

- Reduced micro-planning data processing time from 24 hours to 1 second, eliminating critical bottlenecks in legacy systems. - Architected high-scalability solutions to support 1k+ requests per second and massive data volumes (Big Data) - Modernized legacy systems into resilient architectures, increasing concurrent user capacity to 100+

- Redesigned and refactored critical backend and frontend components of core legacy features, significantly improving system stability - Successfully implemented 500+ hotfixes and resolved complex production bugs across the entire stack, ensuring seamless service continuity - Partnered with cross-functional teams to define technical requirements and drive alignment, accelerating the delivery of high-value features

- Boosted customer retention by 15% by architecting and deploying a custom technical solution tailored to core business requirements - Optimized distribution center operations by 15% through workflow automation and integrated software solutions, significantly enhancing the end-customer experience - Led end-to-end IT project lifecycles, driving multiple initiatives from initial conception to 100% implementation while ensuring alignment with strategic business goals

- Optimized application performance by 20% by identifying and fixing 500+ backend defects in the core legacy system - Engineered a high-performance validation engine capable of processing 80,000 mass claims in just 2 minutes, drastically improving data ingestion efficiency - Developed and deployed strategic backend features that added direct business value and improved the UX across diverse product ecosystems

- Successfully implemented 100+ hotfixes within the HR module through proactive maintenance and strategic ticket resolution - Reduced content update time by 80% by optimizing internal Web systems and implementing a more dynamic, scalable codebase - Developed and implemented a high-performance payment system, streamlining the payroll process for over 5,000 public servants