Senior System Engineer

Summary

Join Network Optix as a Senior System Engineer and lead the design and architecture of the company's network and IT systems. You will establish company-wide processes for server management and maintain applications and services. Responsibilities include designing and maintaining virtual environments, network infrastructure, and monitoring systems. You will also troubleshoot issues, provide prompt support, and manage high-load DNS systems. The role requires collaboration with cross-functional teams and occasional after-hours work. This position offers a hybrid or remote work option in Belgrade, Serbia.

Requirements

• Bachelor’s degree in Computer Science or a related field, or equivalent professional experience
• At least 8 years of hands-on experience in a corporate IT environment, including server/network systems and end-user support
• Extensive experience with Linux, Microsoft Windows Server (2003, 2008, 2012), and Mac devices in a mixed environment
• Strong troubleshooting skills and support experience with Linux, Mac OS, and Windows Server environments
• Deep understanding of networking, including routing management and dynamic routing protocols (BGP), VLAN tagging and policy configuration, and Quality of Service (QoS) setups
• Experience configuring and managing enterprise-class networking equipment — Mikrotik Enterprise is a must
• Experience with cloud-based infrastructure
• Experience designing and managing networks with high-bandwidth traffic (e.g., video streaming)
• Experience managing and deploying Linux/Unix systems
• Proficiency in installing, configuring, networking, and maintaining virtual servers
• Ability to configure and manage enterprise-class switches, routers, and wireless access points
• Experience configuring Storage Area Networks (SAN)
• Experience monitoring highly distributed infrastructure environments
• Strong scripting experience in Bash and Python (JavaScript is a plus)
• Deep knowledge of networking stacks and TCP/IP implementations across different operating systems
• Solid understanding of the OSI model and hands-on experience with traffic analysis tools such as tcpdump , Wireshark , logs, and Torch
• Thorough understanding of operating systems in enterprise environments
• Ability to identify and resolve complex technical issues with minimal supervision
• Strong collaboration skills to work across teams in resolving IT-related issues
• Ability to independently manage complex technical projects, such as system implementations and upgrades
• Advanced knowledge of server and network operations in enterprise environments
• Proficiency with Jira
• Proficiency with Google Workspace (formerly G Suite)
• Professional attitude and excellent communication skills
• Self-starter capable of working independently and managing assigned projects with minimal oversight

Responsibilities

• Leading the company’s Network and IT Systems design and architecture
• Establishing company-wide processes for server installation, configuration, maintenance, backups, and recovery
• Maintaining applications and services provided by the IT team
• Designing, installing, and maintaining virtual environments across the company in a high-availability setup
• Designing, installing, configuring, and maintaining company-wide network infrastructure and equipment
• Identifying, tracking, and resolving issues in the corporate issue tracking system
• Configuring and maintaining network and server monitoring systems (Zabbix + Proxies, custom SNMP OID tracking, and in-house developed statistics trackers)
• Providing prompt and effective responses to technology-related issues
• Being available to work occasionally after hours or on weekends to support company or IT projects
• Resolving user issues related to the server and network environment
• Configuring and maintaining production-grade VPN servers (multi-node OpenVPN CE, L2TP/IPSec tunneling, DNS geobalancer & failover over AWS Route 53)
• Supporting and optimizing high-load DNS systems (current production handles ~400k–500k DNS requests per minute during peak load phases)

Preferred Qualifications

Experience working in a software development company

Benefits

• Competitive compensation
• Paid time off
• Flexible working hours
• Hybrid work in our brand-new, comfortable office
• Employer-sponsored health coverage
• Working with top industry experts in our international team
• Hybrid or Remote