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Guillermo Castillo
Systems Engineer
IT Manager, Software Developer
  • Country:
    Guatemala
  • City:
    Guatemala City
  • Age:
    51
Español
English
Português
ASP.NET / C#
SQL Server
SAP Business One
Process Automation
IT Management
  • .NET Framework, Visual Studio
  • MySQL, PostgreSQL
  • HTML5, CSS3, JavaScript
  • Network Administration
  • COBIT, ITIL Frameworks
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Systems Engineer
and IT Professional

<code> I build </code>
Contact Me
Guillermo Castillo
22+
Years Experience
50+
Projects Completed
15+
Companies Served
5+
Certifications

My Services

ERP Implementation
SAP Business One implementation and administration. Full-cycle deployment from requirements analysis to go-live support and user training across multiple locations.
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Software Development
Custom web applications using ASP.NET, C#, Visual Basic.NET. Database design and optimization with SQL Server, MySQL, and PostgreSQL for enterprise solutions.
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Process Automation
Streamlining business operations through intelligent automation. Reducing manual work, eliminating errors, and improving efficiency across departments.
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IT Management
Leading IT departments and technology strategy. Team leadership, budget planning, vendor management, and alignment with business objectives.
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Database Administration
SQL Server, MySQL, and PostgreSQL administration. Performance tuning, backup strategies, security implementation, and data migration projects.
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Professional Expertise

Development
ASP.NETC#
  • Web Applications
  • Desktop Solutions
  • Database Design
  • API Integration
  • Legacy System Modernization
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Consulting
$45h
  • Technology Assessment
  • SAP Business One Support
  • Process Optimization
  • IT Strategy Planning
  • Team Training
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Full Time
$4500m
  • IT Management
  • Systems Architecture
  • Team Leadership
  • Project Delivery
  • Vendor Relations
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Recommendations

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Roberto Díaz-Durán
Gerente General, Grupo Industrial Monterrey
Guillermo ha demostrado excepcional capacidad técnica y liderazgo en la implementación de SAP Business One. Su compromiso con la excelencia y su capacidad para resolver problemas complejos han sido fundamentales para nuestra transformación digital.
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Claudia Ramírez
Ex Jefa, DIGEF
Un profesional altamente competente que desarrolló el Sistema de Estadística Deportiva de manera impecable. Su dominio técnico y dedicación hicieron posible entregar un producto robusto que aún hoy sigue en producción.
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Aroldo Betancourth
Ex Subgerente, Banco Industrial
Guillermo coordinó con éxito la administración del Riesgo Tecnológico en toda la Corporación BI. Su conocimiento en COBIT e ITIL y su capacidad de trabajo bajo presión fueron invaluables para cumplir con las regulaciones de la Junta Monetaria.
Microsoft
SAP
SQL Server
.NET
© 2026 Guillermo Castillo
Systems Engineer | IT Manager | Software Developer

Guillermo Castillo