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Bartosz Bartczak

@bartoszbartczak

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Senior Network and Systems Administrator specializing in Linux, storage, backups and enterprise networking.

Poland

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What I'm looking for

I seek a challenging infrastructure role where I can manage networks, storage and backup systems, automate operations, improve security, and mentor teams in a collaborative, growth-oriented environment.

I am a senior network and systems administrator with decades of hands-on experience managing enterprise-class servers, networks and storage solutions across multiple sites.

I have administered ~80 physical and virtual servers, managed global FreePBX deployments, and led extensive backup modernization projects using Bacula, JovianDSS, Borg, GlusterFS and Ceph.

My networking expertise covers routing and switching (BGP, OSPF, VLANs), Cisco and Mikrotik devices, GPON, DDoS mitigation and branch networking, alongside strong Linux/BSD system administration skills.

I automate and script in Bash and Python, maintain monitoring and security tooling (Nagios, Wazuh, Nessus), and have experience with virtualization, cloud (AWS), and storage architectures—delivering reliable, secure infrastructure and measurable performance improvements.

Experience

Work history, roles, and key accomplishments

Senior Network Administrator

Open-E

Jun 2023 - Dec 2026 (3 years 6 months)

Administered ~80 production and test servers and global FreePBX instances; led backup modernization using Bacula, JovianDSS, Borg, GlusterFS and Ceph, reducing full-server rsync times from ~1–6h to ~5min. Managed MySQL replication, monitoring (Nagios, Smokeping, Wazuh), security audits and internal network/BGP between branches.

Linux Bacula Borg Backup Ceph BGP Nagios Ansible

IT Network Administrator

Algrim

Mar 2006 - May 2023 (17 years 2 months)

Managed ISP network operations including GPON deployment, AS198909 maintenance, ~25 MikroTik/Linux routers, VPS virtualization and DDoS mitigation via BGP blackholing. Designed and implemented networks and QoS for ~1,000 users.

Mikrotik Linux GPON BGP Virtualization Bash Scripting

IT Network Administrator

Algrim

Nov 2003 - Feb 2006 (2 years 3 months)

Connected new clients and provided network administration and troubleshooting for ISP customers, maintaining network stability and service provisioning.

Mikrotik Linux ISP

IT Clerk

Poczta Polska

Apr 2001 - Jul 2002 (1 year 3 months)

Maintained and updated Płatnik payroll software across branch sites, tested new releases and trained staff on system usage to support company computerization efforts.

Software Testing User Training Windows Server Patch Management