Greece
20+ years in ICT has taught me one thing: technology only works when it’s reliable. Currently, I’m an IT Manager & Senior SRE at Atos, where I bridge the gap between complex infrastructure and seamless operations. Whether it’s building out data centers, migrating to the cloud, or fine-tuning VMware and IP systems, my goal is always the same: building resilient systems that empower teams to do their best work.
Led and coached onsite engineers, boosting performance and operational efficiency. Managed IT budgets and optimized procurement of workplace equipment. Administered VMware, VPNs, firewalls, and storage systems, ensuring reliable infrastructure. Designed and deployed a new Data Center and migrated infrastructure and Atlassian tools to the cloud. Supported R&D with Jenkins, Git, Gerrit, and Kubernetes, enhancing development workflows. Ran day-to-day operations and maintenance of server and network infrastructure, including Windows/Linux servers, VLANs, L2/3 switches, and firewalls, ensuring system reliability and performance.
Diagnosed and resolved complex issues in Unify enterprise communication products, ensuring rapid resolution and high customer satisfaction. Supported unified communication, web collaboration, video conferencing, and mobile applications, improving reliability and user experience.
Provided 24×7 global L3 support for Unify enterprise communication systems, ensuring rapid incident resolution and minimal downtime. Diagnosed, reproduced, and resolved complex issues, improving product reliability and customer satisfaction. Collaborated with software and QA teams to enhance product quality and testing processes. Installed, configured, and maintained Cisco IOS/XR, ASA Firewalls, and IPsec VPNs, ensuring secure and stable network operations. Administered VMware environments (500+ VMs) with DRS and HA, enhancing infrastructure resilience. Managed VoIP telephony systems across Athens and Munich (600+ users), optimizing internal communications. Applied Agile and Waterfall methodologies using Jira and Confluence to streamline project execution.
Managed the core and private IP backbone network for Siemens Group in Athens, ensuring robust connectivity and reliability for operations. Designed and implemented core network solutions, which enhanced system performance and scalability. Installed, configured, and maintained Cisco products, including firewalls and adaptive security appliances, which improved security and data protection. Applied knowledge of IPsec VPN, GRE Tunneling and OSPF protocol to enhance network security and efficiency, helping to safeguard sensitive data. Participated in a workshop in Munich to facilitate the transfer of the GGSN CPG-3300 mobile core packet switched system from Germany to Athens, which strengthened collaboration and knowledge sharing.
Provided daily support for large-scale customers, managing various internet services such as frame relay, VPNs, leased lines, and LMDS, which ensured uninterrupted connectivity and high customer satisfaction. Delivered technical and network consulting to the sales department, helping them better understand product offerings and improve customer proposals. Configured, maintained, and troubleshot Cisco routers and Catalyst switches, as well as WAN switches like MGX, IGX, and BPX, which enhanced overall network reliability and efficiency. Applied in-depth knowledge of routing protocols including OSPF, EIGRP, BGP, and ATM, ensuring effective data routing and optimal network performance. Oversaw the assignment and allocation of IP addressing, including IPv4 and IPv6 space, BGP AS Numbers, and DNS delegations, which facilitated seamless integration for both customers and the NOVA core network.