GRANT TISSUE

(214) 592-7716 · granttissue4@gmail.com · linkedin.com/in/grant-tissue

SUMMARY

Network Engineer with 10+ years of self-directed IT experience and 1.5 years of enterprise VoIP deployment. Deploys and secures network/firewall infrastructure (MikroTik, FortiGate, UniFi), architects LTE failover solutions, and diagnoses complex SIP/RTP issues through packet capture and deep packet analysis under SLA pressure. CompTIA A+ and Network+ certified; CCNA in progress; pursuing AAS in Cybersecurity.

EXPERIENCE

Network Engineer / Deployment Architect · SpectrumVoIP, Inc.

Jan 2026 – Present · Plano, TX

Deployed and configured MikroTik, FortiGate, and UniFi network and firewall infrastructure across client sites, working directly with client IT departments to establish DMZ segmentation and dedicated network gateways that maintained 99.999% uptime across all deployed voice services.
Rolled out LTE failover solutions (ConnectedIO with T-Mobile/AT&T) across 5–10 client sites over the past 6 months, eliminating single points of failure for business-critical VoIP connectivity.
Restructured previously flat client networks into VLAN-segmented architectures, separating voice and data traffic in high-traffic environments to ensure clean upstream packet flow and prevent network-wide congestion.
Diagnosed provisioning failures using packet capture (PCAP) and deep packet analysis — including isolating a Cisco router misconfiguration that was silently blocking a phone's reachability to the provisioning server — and resolved the issue without disabling router security features.
Flashed custom firmware on Cisco IP phones to enable third-party SIP/PBX compatibility, expanding the range of hardware supported during client onboarding.
Architected enterprise client onboarding onto SpectrumVoIP's Stratus platform, reducing average deployment time by 30% through pre-validated SIP phone configuration templates used across 20+ concurrent client rollouts.
Resolved real-time SIP/RTP connectivity failures for 5–10 business clients per week, maintaining 98%+ SLA adherence while coordinating with field technicians across multi-site deployments and serving as primary technical liaison — reducing escalation callbacks by ~25%.

VoIP Analyst · SpectrumVoIP, Inc.

Sep 2024 – Jan 2026 · Plano, TX

Owned 30+ customer tickets per week end-to-end via Zendesk and ConnectWise, diagnosing SIP phone, network, and VoIP service failures for business clients across diverse on-site environments.
Exceeded SLA targets consistently across 16 months, earning recognition as a top performer in CSAT; promoted to Network Engineer / Deployment Architect after 16 months.
Authored 15+ technical knowledge base articles and escalation runbooks, cutting average resolution time for Tier 1 agents by an estimated 20%.

IT Homelab (Self-Directed) · Personal Lab

May 2016 – Present · Anna, TX

Designed and administered VLAN-segmented networks using Ubiquiti UniFi and Cisco Catalyst 3560, implementing inter-VLAN routing and ACLs across 5+ virtualized network segments.
Deployed Proxmox virtualization hosting 4+ production services (Jellyfin, self-hosted web apps) with automated AWS S3 backups and Lambda-driven serverless cost alerting.
Completed 50+ TryHackMe security labs covering FortiGate firewall/IDS-IPS configuration, network hardening, and threat detection workflows.

TECHNICAL SKILLS

Networking: SIP/VoIP, TCP/IP, VLANs, Layer 2/3 routing, DNS, DHCP, DMZ & network segmentation, LTE failover (ConnectedIO), packet capture & deep packet analysis, Wireshark Hardware & Platforms: Yealink, Grandstream, Cisco IOS, Ubiquiti UniFi, FortiGate, MikroTik Cloud & Virtualization: AWS EC2/S3/Lambda, Proxmox, VMware Ticketing & ITSM: Zendesk, ConnectWise OS Environments: Windows 10/11, Ubuntu, Debian, Fedora, macOS Programming: Go, Python, Bash

CERTIFICATIONS

CompTIA Network+ — Issued Aug 2025, Expires Aug 2028
CompTIA A+ — Active
Yealink Certified Junior IP Engineer — Issued Sep 2024, Expires Sep 2026
CCNA — In Progress

EDUCATION

AAS, Information Systems – Cybersecurity Collin College, Frisco TX Expected 2027