Network Engineer with Juniper - large scale intrastructure (f/m/x)

Sii Poland; Lublin; On-site; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Great Place to Work

Solid financial situation

Centre of internal trainings

Profit sharing

Regular integration events and trips

Medical care

Job summary

Sii Poland is seeking an experienced Senior Network Administrator to manage production network platforms and lifecycle across global POPs, data centers, and backbone infrastructure.

You will collaborate with network engineers and vendors to upgrade and validate platforms, lead rollout efforts, and maintain operational documentation. Strong English skills and 5+ years in production networks are required.

Qualifications

• Minimum 5 years in production network environments.
• Experience with Cisco, Juniper, or Arista gear.
• Strong knowledge of BGP and IGPs (OSPF/ISIS).
• IPv4/IPv6 routing and large-scale networks.

Responsibilities

• Support lifecycle management for production network platforms across global POPs and data centers.
• Plan and execute fleet-wide network upgrade initiatives with readiness checks.
• Lead infrastructure rollout across global POPs, data centers, and backbone network.
• Operate lab/test environment to validate hardware platforms and tooling.
• Collaborate with engineers/vendors to investigate issues and document resolutions.
• Coordinate cross-functional efforts for scalability, compliance, and repeatability of operations.
• Contribute to runbooks and deployment procedures for network changes.

Skills

5+ years experience

Production networking

Cisco/Juniper/Arista

BGP

OSPF/ISIS

IPv4/IPv6

Vendor escalation

English proficiency

Python scripting

Tools

Ansible

Job description

We are looking for an experienced Senior Network Administrator to join our team, focusing on managing and supporting production network platforms. In this role, you will be responsible for lifecycle management across global Points of Presence (POPs), data centers, and backbone infrastructure. You will collaborate with network engineers and vendors to ensure operational excellence while executing network upgrade initiatives and maintaining network infrastructure. This position offers the flexibility of remote work. If you are passionate about network administration and infrastructure management, this opportunity may be the right fit for you.

Your tasks

• Supporting lifecycle management for production network platforms, including hardware, software, firmware, and operating system versions across global POPs and data centers
• Planning, coordinating, and executing fleet-wide network upgrade initiatives, ensuring device qualification and readiness checks are performed
• Leading infrastructure rollout efforts across global POPs, data centers, and the backbone network
• Operating a dedicated lab and test environment to validate hardware platforms, configurations, and automation tooling
• Partnering with network engineers and vendors to investigate platform issues, manage support escalations, and document resolution paths
• Collaborating cross-functionally to support network scalability, compliance, and operational consistency
• Contributing to runbooks, process documentation, and operational procedures for network changes and lifecycle management activities

Requirements

• Minimum 5 years of experience in a production network environment with a focus on operational execution
• Hands-on experience with networking platforms such as Cisco, Juniper, or Arista
• Proficiency in core networking protocols, including BGP, OSPF/ISIS, and IPv4/IPv6
• Solid understanding of large-scale network operations, including executing network change operations and software upgrades
• Demonstrated ability to manage vendor escalations and coordinate support resolution
• Advanced level of English

Nice to have

• Strong organizational and execution skills with attention to detail
• Effective cross-functional communication and collaboration skills
• Scripting ability in Python or a similar language
• Familiarity with network automation tools such as Ansible
• Experience improving operational processes by reducing manual steps and increasing repeatability

Job no. JOB-DUKXT

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

Benefits For You

• Great Place to Work
• Solid financial situation
• Contracts with the biggest brands
• Centre of internal trainings
• Many experts you can learn from
• Open and accessible management team
• Profit sharing
• Passion Sponsorship program
• Regular integration events and trips
• Comfortable and well-equipped offices
• MySii app
• Medical care