Dimitri Giannopoulos
Kingston,NH
Summary
Technical Sales Engineer with expertise in configuring, deploying, and troubleshooting networked and VoIP systems. Proven ability in network integration, topology design, and SSL/TLS certificate implementation. Skilled in API-based system integrations and Linux diagnostics, effectively translating technical requirements into actionable solutions. Strong collaboration with software engineers in structured, process-driven environments.
Overview
6
6
years of professional experience
Work History
Technical Sales Engineer
Unified Office
Nashua, NH
09.2025 - Current
- Installed, configured, and deployed VoIP systems in production environments, integrating hardware and software with customer networks and validating system functionality
- Designed and implemented call flows using FreePBX, including routing logic, auto-attendants, voicemail, and failover paths to meet operational requirements
- Integrated systems with customer environments and existing Practice Management Systems (Open Dental, Dentrix, Eaglesoft) via secure API connections
- Installed and validated SSL/TLS certificates to support encrypted communications for system services and web-based interfaces
- Traveled to TX, MI, and VA to lead on-site deployment and launch of pilot systems, serving as the primary technical representative responsible for installation, validation, and go-live readiness
Tier 2 Support Specialist
Unified Office
Nashua, NH
02.2025 - 09.2025
- Staged and provisioned VoIP systems by deploying base images to TCN hardware, executing configuration scripts, manually applying site-specific settings, and validating system state, required files, and active services prior to installation
- Served as an escalation point for complex VoIP, networking, and system-level issues, performing diagnostics using Linux CLI tools, system logs, and packet captures
- Analyzed system behavior and implemented data usage optimizations, reducing customer data consumption by approximately 20%.
- Created internal technical documentation, diagrams, and training videos to support staff and improve consistency in troubleshooting, deployments, and system configuration
Tier 1 Support Specialist
Unified Office
Nashua, NH
08.2024 - 02.2025
- Provided front-line technical support, incident triage, and documentation within ticket-based systems
Restaurant Manager
Costellos
Haverhill, MA
01.2020 - 07.2024
- Managed daily operations and staff scheduling in a high-volume environment
- Led and trained team members while maintaining operational consistency under pressure
Education
Cybersecurity -
Southern New Hampshire University
Manchester, NH06-2026
Computer Science - Computer Science
Seacoast School of Technology
Exeter, NH06-2018
Skills
- TCP/IP
- ARP
- DHCP
- DNS
- NAT
- LAN/WAN
- SSH
- VPN
- Linux
- Windows
- MacOS
- Asterisk
- SIP
- SSL/TLS certificates
- Encrypted communications
- Secure authentication
- Python
- SQL
- PHP
- APIs
- Wireshark
- Linux CLI utilities
- Ticket-based systems
- Technical documentation
- Firewalls
- Switches
- Routers
- Modems
Personal Information
Title: Technical Sales Engineer
Timeline
Technical Sales Engineer
Unified Office
09.2025 - Current
Tier 2 Support Specialist
Unified Office
02.2025 - 09.2025
Tier 1 Support Specialist
Unified Office
08.2024 - 02.2025
Restaurant Manager
Costellos
01.2020 - 07.2024
Cybersecurity -
Southern New Hampshire University
Computer Science - Computer Science
Seacoast School of Technology