Rafael Castillo
Jacksonville,FL
Summary
Versatile professional with over 10 years of experience in software development, network deployment, administration and technical support. Proficient in programming technologies such as Delphi, SQL Server, and .NET Framework. Skilled in troubleshooting, network cabling solutions, and hardware repair. Highly adaptable with a strong passion for continuous learning.
Overview
13
13
years of professional experience
Work History
Low Voltage Technician
Jax Low Voltage
Jacksonville, FL
10.2024 - Current
- Promoted to Senior Technician level in recognition of outstanding performance, technical expertise, and consistent delivery of high-quality installations in demanding environments.
- Proficient in running and terminating CAT5 and CAT6 cables, configuring network devices such as routers, switches, and access points, and ensuring reliable wired and wireless connectivity.
- Skilled in configuring Cisco switching, access points, and routing devices, including VLAN setup and management.
- Experienced in the installation and repair of CCTV camera systems, access control systems, and video surveillance technologies in residential and commercial environments, including PoE-based devices.
- Hands-on experience installing access control systems, including card readers, electronic locks, and keypads in industrial and commercial environments.
- Proficient in deploying low-voltage wiring and mounting security equipment at elevated heights using scissor lifts and ladders, following OSHA safety protocols.
- Successfully executed warehouse installations of video surveillance, intercom, and access control systems, ensuring compliance with site-specific security requirements.
- Familiar with conduit bending, cable management, and equipment mounting in warehouses and high-ceiling facilities.
- Certified in Cisco Networking Basics, with foundational knowledge in IP networking, routing, and switching.
- Https://jaxlowvoltage.com/
Cable Technician
Comcast Xfinity
Jacksonville, FL
02.2024 - 10.2024
- Installing, maintaining, and troubleshooting cable television, internet, and phone services for residential clients.
- Running and terminating coaxial and Ethernet cables, configuring modems, routers, and set-top boxes, and performing signal testing and optimization.
- Experienced in diagnosing and resolving service issues, ensuring customer satisfaction, and adhering to safety standards and company protocols during installations and repairs.
Technical Supervisor
Dsoft
06.2018 - 08.2018
- Specializing in software development and technical support services.
- Developed custom applications tailored to client needs and provided IT solutions, including hardware repair, network setup, and troubleshooting.
- Oversaw daily operations and project management.
- Development and Deployment using .NET Technologies, creating APIs and user interfaces with Razor Pages, adhering to design patterns such as Model-View-Controller (MVC) and implementing Dependency Injection for modular and maintainable code.
- Web Development using HTML, JavaScript, and CSS, creating responsive and interactive websites using HTML, JavaScript, and CSS.
- Developing and customizing websites using WordPress, with a strong focus on creating responsive, user-friendly, and visually appealing sites.
- Database Design, Creation, and Management, experienced in designing, creating, and managing databases using MS SQL Server and MySQL.
- Proficient in optimizing databases to third normal form (3NF) for efficient data storage and retrieval.
- Skilled in creating stored procedures, writing T-SQL queries, and performing database performance tuning.
- Adept at modeling databases using UML to ensure clear and structured data relationships, improving both database performance and maintainability.
- Project Development using Object Pascal and Delphi 7, developing projects using Object Pascal and Delphi 7, with a strong focus on building robust desktop applications.
- Proficient in integrating MS SQL Server databases for data storage, retrieval, and management.
- Skilled in creating user interfaces, implementing business logic.
- Cuba
Network Administrator
07.2012 - 08.2018
- Assisted customers fixing and troubleshooting issues.
- Installing, managing and maintaining network infrastructure, ensuring optimal performance, security, and reliability.
- Experienced installing, configuring and administering servers (Linux and Windows).
- Skilled in managing DNS, Active Directory, and Group Policy, as well as troubleshooting network issues.
Education
Bachelor of Science - Computer Science
University of Sancti-Spiritus
05.2011
Foundational C# - undefined
Microsoft
10.2024
Oracle Cloud Infrastructure Foundations Associate - undefined
Oracle
11.2025
Cisco Networking Basics - undefined
04.2024
Skills
- Hardware troubleshooting
- Computer assembly
- Installation of network cables
- Access control deployment
- Network configuration
- Network administration
- Server installation
- Server administration
- DNS
- Active Directory
- Group Policy
Languages
Spanish
Native or Bilingual
English
Full Professional
Credly
https://www.credly.com/users/rafael-castillo.4e8dcdfe
Personal Information
Title: Software Engineer
Certification
Oracle Cloud Infrastructure (OCI) Foundations Associate
Timeline
Low Voltage Technician
Jax Low Voltage
10.2024 - Current
Cable Technician
Comcast Xfinity
02.2024 - 10.2024
Technical Supervisor
Dsoft
06.2018 - 08.2018
Network Administrator
07.2012 - 08.2018
Bachelor of Science - Computer Science
University of Sancti-Spiritus
Foundational C# - undefined
Microsoft
Oracle Cloud Infrastructure Foundations Associate - undefined
Oracle