Theo Hissilent
@theohissilent
Senior engineer managing firewall, SAN, and virtual infrastructure across multiple offices.
United StatesWhat I'm looking for
I’ve managed firewall, switch, server, and SAN operations for corporate networks and multiple US offices, including Cellectis, where I also handled connectivity to offshore locations in France and kept my VMware vSphere environment running while migrating infrastructure to Proxmox.
Before that, at First Data and earlier roles, I ran LAN/WAN and production website load balancing and failover with f5, supported virtualization across VMware ESX and Citrix XenApp/XenDesktop, and built IPSec VPNs and remote access with Cisco AnyConnect and other firewall platforms.
Experience
Work history, roles, and key accomplishments
Senior Engineer
Cellectis.com
Sep 2025 - Present (10 months)
Managed all activities relating to firewalls, switches, servers and SANs, including security for corporate and US offices. Maintained connectivity to offshore location in France and migrated VMware to Proxmox.
Senior Engineer
Minaris RM
Nov 2018 - Sep 2025 (6 years 10 months)
Managed all activities relating to firewalls, switches, servers and SANs, including security for corporate and three US offices. Maintained connectivity to offshore locations in Germany and Japan and built Cloudflare Zero Trust for remote users.
IT Manager - Senior Engineer
PDR Networks/ConnectiveRx
Apr 2010 - Nov 2017 (7 years 7 months)
Managed all activities relating to firewalls, switches, servers and SANs, including security for corporate office and co-location data centers. Managed production websites load balancing and failover using f5, and built IPSec VPNs and Cisco AnyConnect for remote users.
Senior Network Engineer
First Data Corporation
Mar 2000 - Mar 2010 (10 years)
Managed all activities relating to LAN/WAN network and security for corporate office and co-location data center. Managed production websites load balancing and failover using f5, and maintained servers including VMware ESX, Windows 2000, Sun Solaris, and Linux.
Senior LAN/WAN Analyst
Theglobe
Mar 1999 - Mar 2000 (1 year)
Responsible for design and maintenance of corporate network consisting of multi-domained Windows NT networks in 5 locations. Supervised Helpdesk and Junior LAN Analysts and maintained external Internet connection.
Network Manager
Project One Consulting
Jun 1997 - Mar 1999 (1 year 9 months)
Managed all activities relating to LAN/WAN network and systems for MetLife Insurance's Pensions Department, including Windows NT and Banyan Vines servers.
Manager Network Services
Smart World Communications
Mar 1996 - Jun 1997 (1 year 3 months)
Responsible for design and implementation of ISP network including ISDN/Analog dial-in and Frame Relay leased line facilities, and T3 access to BBN Planet.
LAN Analyst & Administrator
Bell Atlantic NYNEX Mobile
Dec 1993 - Mar 1996 (2 years 3 months)
Managed all activities relating to LAN/WAN network and systems including design, development, testing, implementation, maintenance, and operational support. Defined strategic direction for LAN/WAN networks aligned with business objectives.
Education
Degrees, certifications, and relevant coursework
Manhattan College
Bachelor of Science, Electrical Engineering
Bachelor of Science in Electrical Engineering from Manhattan College.
Tech stack
Software and tools used professionally
Availability
Location
United StatesAuthorized to work in
Job categories
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