Network Engineer – Load Balancing / F5 BIG-IP

Network Engineer - Load Balancing / F5 BIG-IP

About the Offer

We are looking for an experienced Network Engineer - Load Balancing (F5 BIG-IP) 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.

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)

• On-call: rotating 24/7 on-call, plus planned changes in maintenance windows (usually nights and weekends)

• Location: Remote from Poland

• Start: ASAP

• Languages: fluent English is required; German is a strong plus

Responsibilities:

• Run and operate the Load Balancing product end to end on F5 BIG-IP (LTM, DNS, AFM): from transitioning new infrastructure into operations, through changes and releases, to decommissioning

• Configure, administer and troubleshoot F5 BIG-IP LTM, DNS and AFM

• Manage virtual servers, pools, iRules and SSL offloading, and look after the certificate lifecycle

• Manage the firmware lifecycle, including TMOS upgrades, and F5 BIG-IP licensing

• Analyse and resolve application delivery issues, persistence, health monitors and HA-pair failover

• Carry out planned maintenance and changes in maintenance windows outside core hours and take part in the weekly Change Advisory Board (CAB)

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

• Support the Lead Network Engineer 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 experience with F5 BIG-IP (LTM, DNS, iRules, 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 (ideally banking) environment

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

• Fluent English, spoken and written

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

Nice to Have:

• German language skills

• F5 Certified Solution Expert (F5-CSE)

• ITIL certification

• Network automation with Ansible and Python, and experience with CheckMK and Splunk

Recruitment Process:

• Please apply with your CV in English

• We will share your CV with the client only after you have agreed to it

• Candidates who have already been presented for this client in the last 6 months, directly or through another agency, cannot be considered again