Network Engineer / Linux Administrator

WHO WE'RE LOOKING FOR

An experienced, responsible engineer who stays calm under pressure and doesn't shy away from complex problems. Someone who keeps up with the industry, is genuinely curious about new technologies, and brings that curiosity into their daily work. A team player who contributes to shared goals, takes ownership of driving problems toward resolution and engages the right people when needed, and sees every incident through to full resolution - not just mitigation.

WHAT YOU'LL DO

Office network support - Maintain and support the network infrastructure of the office, its connectivity to other offices, and plan and build network infrastructure when offices expand.

VPN support - Configure, maintain, and support VPN solutions for site-to-site connectivity and remote employee access.

Linux infrastructure management - Own the Linux system lifecycle across office infrastructure: provisioning, configuration management, security hardening, and day-to-day troubleshooting. Maintain and support virtualisation and container host environments running on RHEL-based systems.

Server room operations -Work hands-on in the server room: manage and maintain physical infrastructure including structured cabling (SCS), UPS systems, and rack equipment. Ensure physical layer reliability and documentation.

Network upgrades and testing - Plan and execute network upgrades, perform testing to validate reliability and performance before and after changes.

User support via service desk - Handle network-related requests and incidents within the company's service desk platform, providing timely resolution for end users.

Monitoring and incident response - Oversee monitoring and alerting systems to detect and resolve incidents, identify potential issues proactively, and implement preventive measures.

On-call duty - Participate in on-call rotation to ensure coverage for critical incidents outside regular business hours

Collaboration - Work closely with NetOps team colleagues to jointly deliver network connectivity solutions, share knowledge, and drive incidents through to full resolution.

Documentation - Maintain accurate and up-to-date documentation of network topology, configurations, procedures, and changes.

Automation -Automate routine tasks using scripting, infrastructure-as-code tools, and AI-assisted tooling to reduce manual effort and improve consistency.

Key requirements

3+ years of hands-on networking experience.

Must Have

Switching & routing

Ethernet, 802.1q (VLAN tagging)

xSTP (STP/RSTP/MSTP), LACP

802.1x (port-based network access control / NAC)

OSPF, static routing

VPN & tunneling

IPsec: route-based and policy-based

SSL VPN, OpenVPN - deployment and support

Network services

DHCP, DNS, NTP, NAT

AAA: RADIUS, TACACS+, LDAP

IPAM (IP Address Management) - maintaining and operating IP address space

Firewall & perimeter security

Stateful and NGFW: Fortinet, Juniper SRX or Cisco equivalent

Host-based: iptables, firewalld

Switching platforms

Juniper EX or Cisco Catalyst - access/campus switching

Experience with enterprise-grade switching platforms required

Linux / Unix administration

RHEL-based OS at advanced level - administration, troubleshooting, scripting

Server infrastructure: bare metal, virtualisation (hypervisor), containers

Monitoring

Zabbix, Grafana - dashboards, alerting, threshold configuration

Netflow / IPFIX / sFlow - traffic flow analysis

​AI Tools

Familiarity with modern AI tools, with practical experience using them to improve efficiency and automate routine tasks

Language

Fluency in English language

Should Have

Routing - advanced

BGP: unicast, route reflection, policy, prefix filtering

Security platforms

Juniper SRX - hands-on configuration and troubleshooting preferred

Cloud networking

AWS networking: VPC, Transit Gateway, Security Groups, Route Tables

Load balancing & DNS: AWS Route 53, HAProxy

Wi-Fi

802.11 (a/b/g/n/ac/ax) - configuration and troubleshooting

SD-WAN

Understanding of SD-WAN concepts: centralised policy, underlay/overlay separation, application-aware routing

Physical infrastructure

Structured cabling (SCS) - installation, patching, documentation

UPS systems - basic operation, monitoring, maintenance

Rack and server room equipment handling

Automation

Scripting and automation: Bash, Python

Infrastructure-as-code: Ansible / AWX, Terraform

CI/CD: GitLab CI

High availability & architecture

HA design patterns, clustering

Both greenfield and brownfield deployment experience

Nice to Have

MC-LAG / ESI LAG (multi-chassis link aggregation)

BGP L3VPN

MPLS (transport and services)

SD-WAN platforms: Cato Networks, Zscaler

Wi-Fi management platforms: Juniper Mist, Ruckus, Aruba

MikroTik - RouterOS configuration and troubleshooting

Logging and log management: ELK stack

Cloud networking: Azure, GCP

Networking in Kubernetes

CCNA, JNCIA or equivalent certification

What we offer:

Well-coordinated professional team.

Cutting edge technologies, interesting and challenging tasks, dynamic project, great opportunities for self-realization, professional and career growth.

Additional Health and Life Insurance Package.

Employee Assistance Program.

25 vacation days.

102,26 EUR/200 BGN Digital Food Vouchers via EdenRed and their application

61,36 EUR/120 BGN Gross as part of the salary for Working Expenses Allowance

About RingCentral

RingCentral is a global leader in agentic voice AI–powered business communications, delivering an integrated platform for business phone, SMS, contact center, workforce engagement management, video collaboration, and messaging. As the communications layer connecting businesses and customers, RingCentral is the front door of business communication and is in the advantageous position to apply AI at every phase of the conversation journey — before, during, and after each interaction. Our agentic AI portfolio includes autonomous voice-first AI agents that automate calls, assist in the moment, and analyze every interaction – enabling businesses to work smarter, respond faster, and connect more meaningfully with their customers. Visit ringcentral.com to learn more.

RingCentral is an equal opportunity employer that truly values diversity. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

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