Network Engineer – Load Balancing / F5 BIG-IP

OPTIVEUM sp. z o.o.•Capon Bridge, WV

2d•PLN 160 - PLN 200•Remote

About The Position

Optiveum is recruiting a Network Engineer – Load Balancing (F5 BIG-IP) for the network operations team of the central IT services provider of one of Germany’s largest banking groups. The client operates core banking infrastructure for hundreds of regional savings banks across Germany, in a large, stable and highly regulated environment. The candidate will sign a B2B cooperation agreement directly with Optiveum. The role is 100% remote from Poland, full-time (five days per week), and is planned to run until the end of 2026, with an extension through 2027 planned. The rate is 160–200 PLN per hour net on B2B, depending on experience. The start is ASAP. The role includes rotating 24/7 on-call duties and planned maintenance changes, usually at night and on weekends. Fluent English is required; German is a strong plus.

Requirements

Several years of hands-on experience with F5 BIG-IP (LTM, DNS, iRules and TMOS) in high-availability data center environments.
Working knowledge of F5 BIG-IP AFM.
F5 Certified BIG-IP Administrator (F5-CA) or equivalent certification.
Willingness to join a rotating 24/7 on-call schedule, including nights, weekends and public holidays.
Experience handling major incidents in a regulated environment, ideally banking.
Solid understanding of ITIL processes in a regulated environment, including Incident, Problem, Change, Release, Knowledge, Configuration, Event, Availability and Capacity Management.
Fluent spoken and written English.
An existing one-person company (działalność gospodarcza) registered in Poland.

Nice To Haves

German language skills.
F5 Certified Solution Expert (F5-CSE).
ITIL certification.
Network automation with Ansible and Python, and experience with CheckMK and Splunk.

Responsibilities

Run and operate the F5 BIG-IP Load Balancing service end to end, from transitioning new infrastructure into operations through changes, releases and decommissioning.
Configure, administer and troubleshoot F5 BIG-IP LTM, DNS and AFM.
Manage virtual servers, pools, iRules and SSL offloading, and oversee the certificate lifecycle.
Manage firmware lifecycle, including TMOS upgrades, and F5 BIG-IP licensing.
Analyse and resolve application delivery issues involving persistence, health monitors and HA-pair failover.
Carry out planned maintenance and changes during maintenance windows outside core hours, and participate in the weekly Change Advisory Board (CAB).
Handle second- and third-level incidents and support root cause analysis, known-error documentation and workarounds.
Support the Lead Network Engineer during major incidents, including bridge calls, data collection and emergency changes.
Tune event monitoring in CheckMK and report on service availability, including uptime, MTBF, MTTR and capacity.
Investigate log anomalies flagged in Splunk and maintain standard syslog configurations.
Run vulnerability management, including security patches, CVE tracking and remediation, in line with ISMS requirements.
Maintain the CMDB, including IP addresses, VLANs, VRFs and 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.