Open to opportunities

Sergio Segura

@sergioseguragaitan

Message

I build secure VoIP and CRM-integrated cloud communications systems.

Colombia

Message

What I'm looking for

I'm looking to build and support secure, scalable VoIP and unified communications solutions, especially cloud telephony, CRM integrations, and enterprise deployments where I can own projects from requirements through ongoing support.

I'm a Systems Technician with over 6 years of experience in VoIP, unified communications, and IT infrastructure. I build secure, scalable voice solutions and support enterprise deployments from requirements gathering through ongoing support.

I've managed enterprise 3CX infrastructure for major Colombian organizations like Confacundi and Damas, supporting hundreds of extensions, complex routing, and high-availability requirements with 99.9% uptime. At RIPUZ Soporte, I managed more than 10 cloud instances and over 500 extensions.

I build practical unified communications solutions across 3CX, Asterisk, FreeSWITCH, Avaya, Vodia, and Issabel. My work includes SIP trunking, cloud migrations, Microsoft Teams Phone System integrations, and security controls using Azure NSGs, iptables, and fail2ban.

I've created 3CX integrations for Bitrix24, Salesforce, and custom CRMs using Template Generator, Call Flow Designer, the Call Control API, and webhooks. I also developed time-based call routing for multi-shift operations and use Wireshark and Asterisk debugging tools to resolve complex incidents quickly.

Beyond VoIP, I have hands-on experience in network infrastructure (LAN, WAN, VLANs, QoS, firewalls, VPNs), Linux server administration (Debian/Ubuntu), CCTV and access control systems (Hikvision, Dahua, Zkteco), and SOC operations using Microsoft Sentinel.

Through Techstore, my registered technology business, I lead projects from requirements gathering through deployment and ongoing support, including VoIP, cloud services, IT support, structured cabling, CCTV, and access control.

I'm passionate about solving complex problems, learning new technologies, and delivering reliable, secure, and scalable solutions. I'm open to remote opportunities in VoIP engineering, unified communications, network infrastructure, and IT support.

Experience

Work history, roles, and key accomplishments

IT Support Technician & Systems Analyst

TI Tecnología Innovadora

Sep 2024 - Mar 2025 (6 months)

Led requirements gathering and coordination of 5 IT projects, delivering executive reports that accelerated decision-making by 20%. Deployed and administered 3CX VoIP solutions, achieving a 25% reduction in client telecommunications costs.

3CX Azure VoIP IPtables Structured Cabling CCTV Access Control

Integrador de Soluciones TI

RIPUZ

Sep 2021 - Jun 2024 (2 years 9 months)

• Managed over 10 3CX cloud instances across multiple clients.
• Primary responsible for maintenance and resolution of critical VoIP incidents, reducing downtime by proactive monitoring.
• Led migration projects to cloud-based VoIP platforms (3CX and Asterisk).
• Performed network connectivity and performance diagnostics using Wireshark and Asterisk logs.

Systems Analyst & Service Integrator

Asynka Soluciones Inteligentes

Jan 2022 - Apr 2024 (2 years 3 months)

• Deployed and administered 3CX VoIP solutions,
• Diagnosed and resolved infrastructure incidents, ensuring operational continuity of critical services.
• Managed Linux (Debian/Ubuntu) servers, firewalls, and networks, ensuring system integrity and availability.
• Led requirements gathering and coordination IT projects.
SOC Microsoft Sentinel

3CX Wireshark Asterisk Architect Call Flows Microsoft Teams Playbooks (Microsoft Sentinel)SOC

Support Center Agent

Thomas Greg & Sons – Serdempo S.A.S

Sep 2023 - Nov 2023 (2 months)

• Provided remote technical support to over 30 government officials, configuring network services and ensuring 100% operational readiness during the electoral day.

Starlink Printer Troubleshooting Remote Support Remote Collaboration Remote Monitoring 4G 5G Technology Computer Support

Education

Degrees, certifications, and relevant coursework

Google / Coursera

Foundations of Cybersecurity, Cybersecurity

2025 - 2025

Certification in cybersecurity fundamentals, including threat identification, network security practices, and protection of critical infrastructure.

Hikvision

DVR & NVR Basic Configuration, CCTV & Video Surveillance

2025 - 2025

Certification in installation and configuration of DVR/NVR systems, including IP cameras, recording, storage, and remote visualization.

Hikvision

Access Control Installation, Electronic Security

2025 - 2025

Certification in installation and configuration of access control systems, including biometric readers, electric locks, and access management software.

Amazon Web Services (AWS)

Effective Support Cases for VPN/VPC Issues, Cloud Computing

2024 - 2024

Certification in diagnosing and resolving connectivity issues in cloud environments, including VPNs, VPCs, and network configuration on AWS.

Cisco Networking Academy / MinTIC

Introduction to Cybersecurity, Cybersecurity

2024 - 2024

Certification in cybersecurity fundamentals, including threat identification, network security practices, and protection of critical infrastructure.

3CX

3CX Basic Certified Engineer v18, VoIP & Unified Communications

2022 - 2022

Official certification in administration, configuration, and troubleshooting of 3CX platforms (Cloud and On-Premise), including SIP trunking, call routing, and CRM integrations.