Jason Castro Herrera

Full Stack Developer and QA specialist with experience building web products, testing software, and delivering solutions for hospitality and tourism. Combines frontend and backend development with requirements analysis, test design, and quality management. Brings more than seven years of experience in operational leadership, team coordination, incident resolution, and continuous improvement.

Independent Solutions Consultant and Full Stack Developer at jasoncastro.dev (2021-09 – Present)

• Leads the full web product lifecycle, from definition and architecture through deployment, using React, Node.js, JavaScript, TypeScript, and relational and document databases.
• Designs maintainable systems with C#, SOLID principles, dependency injection, Entity Framework Core, and Microsoft SQL Server.
• Delivers solutions for hospitality, tourism, construction, and service businesses, incorporating API testing, deployments to Vercel or Azure, and quality practices.

QA Specialist | Contract at Linuxtica (2024-09 – 2025-02)

• Established QA workflows and standards for Agile projects using Jira, AIO Tests, and Zephyr Squad.
• Analyzed requirements and risks; designed test plans, test cases, and functional, regression, and smoke tests.
• Validated Stensys, an academic management system, and Sysma, an HVAC service and maintenance platform, coordinating acceptance criteria and defect resolution with developers.

Operations | Operations Manager since 2019 at Arenal Backpackers Resort (2017-12 – Present)

• Leads daily operations in a high-demand environment, coordinating cross-functional teams and customer-focused workflows.
• Oversees data validation, incident resolution, and continuous improvement to sustain the quality and reliability of operational processes.

Systems Engineering – Universidad San Marcos Advanced Technical Degree in Full Stack Web Development, completed in five academic terms – Universidad Creativa (2022 – 2024) QA Testing based on ISTQB standards – Linúxtica (2024-02 – 2024-06)