Network Engineer – Data Center Network / Cisco ACI & Nexus in Katowice

Network Engineer – Data Center Network / Cisco ACI & Nexus About the Offer We are looking for an experienced

Network Engineer – Data Center Network

to join the network operations team of the central IT services provider of one of Germany's largest banking groups. The client runs the core banking infrastructure for hundreds of regional savings banks across Germany, so you will work in a large, stable and highly regulated environment. The data center network is planned to move to Huawei components from 2028, so you will also have the chance to get involved in that transition.

For this role,

Optiveum

is the recruitment and contracting party, which means you will sign the B2B cooperation agreement directly with us.

Key Details:

Rate:

160–200 PLN/h net (B2B), depending on experience

Contract:

B2B with Optiveum, until the end of 2026 with a planned extension through 2027

Work Model:

100% remote, full-time (5 days per week)

Location:

Remote from Poland

Start:

ASAP

Languages:

fluent English is required; German is a strong plus

Responsibilities:

Run and operate the Data Center Network product end to end on Cisco ACI and Cisco Nexus (9k, 7k), and on Huawei components from 2028: from transitioning new infrastructure into operations, through changes and releases, to decommissioning

Configure, administer and troubleshoot Cisco ACI, including APIC, tenant policies and L4-L7 service graphs

Configure and support Cisco Nexus switching with NX-OS, vPC, FEX and M-FC

Carry out ACI fabric upgrades and EPG changes in coordination with the Lead Network Engineer

Manage the firmware lifecycle for Nexus and ACI and handle licences with Cisco Smart Licensing

Prepare for the planned Huawei CloudEngine rollout

Analyse and resolve fabric outages, packet loss and multipath issues

Handle 2nd and 3rd-level incidents and support root cause analysis, known-error documentation and workarounds

Support the Lead Network Engineer and on-call lead during major incidents (bridge calls, data collection, emergency changes)

Tune event monitoring in CheckMK and report on service availability (uptime, MTBF, MTTR) and capacity

Investigate log anomalies flagged in Splunk and maintain standard syslog configurations

Run vulnerability management (security patches, CVE tracking, remediation) in line with ISMS requirements

Maintain the CMDB (IP addresses, VLANs, VRFs, configuration items) and track licences and asset lifecycle

Support internal and external audits and drive continual service improvement and automation

Share knowledge with stand‑ins and contribute to runbooks, configuration standards and SOPs

Requirements:

Several years of hands‑on operations experience in data center environments

Solid knowledge of Cisco ACI, including APIC, tenant concepts and L4‑L7 integration

Solid knowledge of Cisco Nexus and NX-OS

Cisco CCNA or CCNP Data Center certification (or equivalent); CCNP Data Center preferred for senior candidates

Some experience with Huawei data center / CloudEngine components, or willingness to learn them quickly

Experience handling major incidents in a regulated (ideally banking) environment

Solid understanding of ITIL processes in a regulated environment: Incident, Problem, Change, Release, Knowledge, Configuration, Event, Availability and Capacity Management

Experience maintaining operational documentation

Fluent English, spoken and written

An existing 1-person company (działalność gospodarcza) registered in Poland

Nice to Have:

German language skills

Huawei HCIP or HCIE Datacom certification

ITIL certification

Network automation with Ansible and Python, and experience with CheckMK

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