Senior Network Engineer

Randstad Polska Sp. z o.o.; Warszawa; On-site; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Annual performance bonus

Private medical care (family options)

Training & certification support

Flexible working hours

Sport card

Job summary

Randstad Polska Sp. z o.o. is seeking a senior Network & Security Architect to shape our international IT infrastructure.

You will bridge high-level designs with robust security engineering across LAN/WAN/WLAN and core services, delivering scalable HLD/LLD solutions and SME leadership with the MSP and cross-functional teams. You will own architecture, enforce security standards, and drive automation within an Agile environment, while championing continuous infrastructure optimization and

Qualifications

• 5+ years of hands-on experience in enterprise-scale network and security design, implementation, and troubleshooting.
• Proficiency in TCP/IP, BGP, OSPF, STP and hands-on experience with Cisco Nexus/ISE products.
• WAN/SD-WAN deployment, optimization, and advanced troubleshooting.
• Strong proficiency with Next-Generation Firewalls, Fortinet FortiGate; NSE4 possible within 6 months.
• Excellent English (B2+/C1) for global collaborations.

Responsibilities

• Design, test, and develop enterprise-wide network and security infrastructure across LAN, WAN, WLAN, and core services (DNS, IPAM, AAA).
• Serve as a primary technical consultant translating business needs into scalable HLD and LLD solutions.
• Enforce network security policies and firewall rules in coordination with global cybersecurity teams.

Skills

Enterprise networking

Security design

WAN/SD-WAN deployment

Fortinet FortiGate

Cisco IOS/Nexus/ISE

Network troubleshooting

Education

Cisco CCNP certification

Tools

DNS

IPAM

AAA

WAF tuning

Job description

Join a global enterprise team dedicated to shaping the future of international IT infrastructure. In this high-impact role, you will bridge the gap between high-level architectural design and robust security engineering across global LAN, WAN, SD-WAN, WLAN, and network security domains.

Rather than focusing on routine operational handling, you will take ownership of High-Level (HLD) and Low-Level Designs (LLD), drive continuous infrastructure optimization, and solve complex, high-tier technical challenges. You will act as a Subject Matter Expert (SME), partnering with our Managed Service Provider (MSP) and cross-functional international teams to deliver resilient, high-performing networks.

What will your tasks involve?

• Architecture & Design: Design, test, and develop enterprise-wide network and security infrastructure across LAN, WAN, WLAN, and supporting core services (DNS, IPAM, AAA).

• Business Partnering: Serve as a primary technical consultant translating complex business needs into scalable HLD and LLD solutions.

• Security Standards: Enforce network security policies, Next-Gen Firewall rulesets, Web Application Firewall (WAF) policies, and secure remote access protocols in coordination with global cybersecurity teams.

• MSP Oversight & SME Leadership: Act as an SME providing technical guidance to our external Managed Service Provider (MSP). Validate Low-Level Designs, steer critical escalations (P1/P2), and ensure operational consistency.

• Process & Automation Enhancement: Drive operational efficiency within an Agile team structure, streamlining IT processes and supporting Infrastructure-as-Code (IaC) initiatives

What we expect from you?

• Experience: Minimum 5+ years of hands-on experience in enterprise-scale network and security design, implementation, and troubleshooting.

• Core Networking Expertise: Deep proficiency in TCP/IP, BGP, OSPF, STP, and hands-on experience with Cisco enterprise products (Catalyst switches, Nexus switches, routers, and ISE).

• WAN / SD-WAN Mastery: Proven background in WAN and SD-WAN deployment, optimization, and advanced troubleshooting.

• Network Security & Firewalls: Strong proficiency with Next-Generation Firewalls—preferably Fortinet/FortiGate.

  (Note: If you possess strong core network/SD-WAN background without prior Fortinet experience, we will fully sponsor and support your Fortinet NSE 4 certification within your first 6 months).

• Certification / Knowledge Level: Cisco CCNP or equivalent practical depth (current or expired certifications are accepted).

• Languages & Soft Skills: Excellent spoken and written English (B2+/C1 level) for daily collaboration with global teams. Strong analytical mindset, assertiveness, and team-player attitude in international environments.

Nice to Have

• Hands-on experience with Web Application Firewall (WAF) tuning, rule creation, and false-positive mitigation.

• Solid understanding of HTTP/HTTPS protocols, web application security (OWASP Top 10), and SSL Inspection.

• Experience with hybrid DNS environments (on-premises and cloud integration).

What you can expect from us?

• Contract: Long-term Employment Contract (Umowa o pracę).

• Bonuses: Annual performance bonus (up to 7%) + festive financial benefits paid twice a year (April & December).

• Health & Security: Comprehensive private medical care (Medicover, with options for family coverage) and group life insurance.

• Professional Growth: Full coverage of training courses and professional certification exams (e.g., Fortinet).

• Perks & Wellbeing: Sports card (Medicover Sport), language courses, flexible working hours, and regular team wellbeing activities.

Employment agency entry number 47

this job offer is intended for people over 18 years of age

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