Network Engineer (Load Balancing) – F5 BIG-IP

Quick Facts

• Role: Network Engineer focused on load balancing with F5 BIG-IP (LTM, DNS, AFM)

• Work model: 100% remote (Poland)

• Contract: B2B, until end of 2026 with planned extension through 2027

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

• On-call: Rotating 24/7 on-call plus maintenance-window changes (nights/weekends)

• Start: ASAP

• Language: Fluent English required; German is a strong plus

Description

Operate and administer F5 BIG-IP load balancing services end to end, supporting a large banking infrastructure in a highly regulated environment. Responsibilities span configuration, change/releases, incident handling, monitoring, security patching, and lifecycle management (including HA failover and certificate/firmware updates). The role also includes participation in CAB meetings and knowledge sharing through runbooks and SOPs.

Responsibilities

• Run and operate F5 BIG-IP load balancing end to end (LTM, DNS, AFM): transition into operations, changes/releases, and decommissioning

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

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

• Manage firmware lifecycle (TMOS upgrades) and F5 BIG-IP licensing

• Analyze and resolve application delivery issues (persistence, health monitors, HA pair failover)

• Perform planned maintenance and changes in maintenance windows; participate in the weekly Change Advisory Board (CAB)

• Handle 2nd/3rd-level incidents and support root cause analysis with 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 service availability and capacity (uptime, MTBF, MTTR)

• Investigate log anomalies flagged in Splunk and maintain standard syslog configurations

• Run vulnerability management (security patches, CVE tracking, remediation) aligned with ISMS requirements

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

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

• Share knowledge with stand-ins; 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 rotating 24/7 on-call, including nights, weekends, and public holidays

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

• Solid understanding of ITIL processes in regulated environments (Incident, Problem, Change, Release, Knowledge, Configuration, Event, Availability, Capacity)

• Fluent English (spoken and written)

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

Benefits

• 100% remote work, full-time (5 days/week)

• B2B contract through end of 2026 with planned extension into 2027

• Net rate of 160–200 PLN/h depending on experience

• Rotating 24/7 on-call with scheduled maintenance-window changes

• Opportunity to work in a large, stable, highly regulated banking infrastructure