Janier Treto

SaaS platform for fire and emergency medical services operations. Part of the Fire Prevention team.

• • Built and maintained Vue.js-based emergency team UIs in close collaboration with cross-functional teams, achieving a 25% increase in user satisfaction scores and a 50% reduction in front-end errors.

• • Designed and maintained RESTful APIs and microservices using PHP (Yii2) powering real-time dispatch and incident reporting features used by first responders.

• • Reduced database query execution time by 35% through index tuning, composite indexes, and N+1 query elimination, resulting in 35–40% faster critical report load times.

• • Managed CI/CD pipelines (GitHub Actions, Jenkins) and Docker-based deployments, ensuring high availability and zero-downtime releases for a mission-critical platform.

• • Participated in Agile sprints with product and QA teams; performed code reviews and established coding standards fostering a culture of quality and continuous improvement.

Government technology center serving banking and e-commerce clients.

• • Developed and maintained full-stack features using PHP (Laravel), Python, and JavaScript, covering database schema design, backend logic, and frontend integration for high-traffic financial and e-commerce applications.

• • Eliminated backend performance bottlenecks by refactoring Laravel models and optimizing database indexes, delivering a 30% improvement in API response times for key endpoints.

• • Designed and implemented security architecture for banking and e-commerce platforms using AlienVault USM, ACID-compliant transactions (MySQL/PostgreSQL), and OWASP best practices — achieving zero data breaches over multiple years in production.

• • Led and mentored a team of 5 junior developers through code reviews, pair programming sessions, and coding style guides — reducing production bugs by 60% and accelerating two developers to mid-level within 8 months.

• • Ensured consistency, security, and performance at every layer through unit and integration testing using PHPUnit and Jest.