Senior Infrastructure & VoIP Engineer / Infrastructure Lead (SIP/VoIP focus), Dubai

Job Title: Senior Infrastructure & VoIP Engineer

Employer: Callgear DMCC

Location: Dubai, Jumeirah Lake Towers

Job Type: Full-Time

Salary: When applying for the position, please make sure to include your expected salary. Salary is negotiable based on experience and results of the interview process.

About Us:

Callgear is at the cutting edge of communication technology, providing solutions for efficient communications and advertising. We connect UAE companies with a cloud based phone system and provide communication services that make their business processes transparent and controllable, help them identify and solve problems in sales and increase income.

More about us here: callgear.ae

Role Summary:

This is a senior-level role combining expertise in IT infrastructure, networking, and VoIP systems. You’ll be responsible for maintaining and developing a distributed, high-load infrastructure across multiple data centers, supporting telephony systems, ensuring uptime, traffic quality, and secure operations. The role includes both strategic planning and hands-on engineering work.

Key Responsibilities:

IT Infrastructure & Network:

• Ensure the uninterrupted operation of IT systems in multiple data centers (in different countries) and virtual infrastructure segments.

• Plan, budget, and execute development of the company’s IT infrastructure.

• Manage and expand a distributed network of virtual SIP servers, including multi-region deployments and HA clusters.

• Design and implement replication, backup, and failover schemes for mission-critical systems.

• Administer and scale IP networks based on Cisco and MikroTik.

• Maintain HP-based physical server infrastructure.

• Set up and operate Zabbix monitoring for real-time visibility of load, channel capacity, SLA metrics, and failure points.

• Handle incident reports, conduct root cause analysis, and manage communication with providers and partners.

VoIP, SIP & Telephony Systems:

• Administer and develop SIP/VoIP infrastructure across multiple countries.

• Deep diagnostics of SIP/RTP traffic using tools like sngrep, tcpdump, Wireshark.

• Set up, monitor, and optimize SIP trunks, GSM gateways, telephony clusters, and operator integrations.

• Support and maintain FreeSwitch, Asterisk, AVAYA, FLAT Softswitch systems.

• Perform diagnostics, traffic management, and fine-tuning of routing and SIP logic.

• Troubleshoot complex call routing issues and implement effective routing failovers.

Requirements:

Must-have Experience & Skills:

• Solid experience (5+ years) in VoIP/telecom infrastructure, including SIP architecture, PBX systems, and IP telephony.

• Strong knowledge of Linux (CentOS, Ubuntu, Debian) and Windows Server administration.

• Practical expertise in scripting and automation for system administration (e.g., Bash, Python).

• Experience configuring and administering key network services: IP routing, DNS, DHCP, Squid, IPsec.

• Deep understanding of networking (CCNA level and higher): VLAN, BGP, OSPF, VPN, SSTP.

• 5+ years working with Cisco and MikroTik hardware in complex environments.

• Experience in network perimeter protection and traffic control.

• Confident working with HP server hardware and diagnostics.

• Familiarity with modern VoIP protocols: SIP, H.323, WebRTC, RTP.

• English proficiency sufficient for fluent technical chat communication (Slack, email, ticketing).

Nice to Have:

• Experience working in a multi-country infrastructure with strict SLAs.

• Experience with carrier-grade voice platforms and telecom SaaS environments.

• Background in telecom integration with business communication systems (CRM, call analytics, etc.).

Required language skills:

• English: Upper intermediate+ (required)

• Russian (required)

What We Offer:

• Competitive compensation: Basic salary + KPI Bonus.

• Full support benefits: UAE resident visa and corporate health insurance, relocation support and allowance.

• Comfortable workplace and friendly atmosphere in the office.

• Professional development and growth opportunities.

• Remote work on Fridays :)

If you’re ready to be part of an exciting journey with CallGear and contribute to the success of businesses across the UAE and beyond, apply now!