VoIP Engineer

Job description / Role

Description

Tabby creates financial freedom in the way people shop, earn and save by reshaping their relationship with money. Over 15 million users choose Tabby to stay in control of their spending and make the most out of their money.

The company's flagship offering allows shoppers to split their payments online and in-store with no interest or fees. Over 40,000 global brands and small businesses, including Amazon, Noon, IKEA, and SHEIN use Tabby to accelerate growth and gain loyal customers by offering easy and flexible payments online and in stores.

Tabby generates over $10 billion in annual transaction volume for its partner brands and is the highest-rated, most-reviewed, largest, and fastest-growing FinTech in the GCC region.

Tabby launched in 2019 and has since raised over $1 billion in equity and debt funding from global and regional investors, and is now valued at $4.5 billion.

We are hiring a VoIP Engineer who will be responsible for leading VoIP platform development, integrating with regional telecom providers, and ensuring high availability of mission-critical voice services. This role requires hands-on technical mastery, regulatory awareness, and strong vendor management skills.

Key Responsibilities

• VoIP Architecture & Operations: Design, deploy, and maintain enterprise-grade VoIP systems (Genesys Cloud CX1 - BYOC Cloud/Edge, Asterisk, ZIWO, GSM gateways such as Dinstar/Yeastar/UC2000).
• Carrier Integration: Manage interconnections with regional telecom operators (Etisalat, du, STC, others), covering testing, deployment, and troubleshooting complex scenarios.
• Protocol Mastery: Deep SIP/RTP/SRTP work - advanced SIP header tuning (From, Contact, Diversion, P-Asserted-Identity), NAT traversal, SDP analysis, early media, re-INVITEs, and timeout handling.
• Advanced Troubleshooting: Act as L3 escalation point; analyze packet captures (Wireshark/tshark) to resolve one-way audio, packet loss, jitter, and media quality issues.
• Automation & Scripting: Develop utilities and scripts (Bash/Python) for monitoring, CDR exports, log handling, and process automation.
• High Availability & Disaster Recovery: Design clustering, trunk redundancy, and disaster recovery for voice infrastructure.
• Vendor & Regulator Interaction: Open and drive vendor support cases, negotiate with carriers, and work with regulators (TRA UAE, CITC KSA) to meet compliance requirements.
• Data Center Work: Perform safe physical interventions (installing, switching, replacing modules/servers) and plan preventive maintenance.
• Service Ownership: Participate in on-call rotations, taking ownership of VoIP services and providing critical support during incidents, including outside business hours if required.
• Documentation & Projects: Produce detailed technical documentation and manage multiple parallel projects with proper prioritization and reporting.

Skills, Knowledge & Expertise

• 3+ years managing large-scale VoIP infrastructures for enterprises or carriers.
• Deep knowledge of SIP/RTP/SRTP protocols, SIP timers, session refresh, topology hiding, and NAT traversal.
• VoIP-related Linux administration skills: system monitoring, tcpdump/pcap analysis, QoS, firewalls (iptables/nftables), and SIP DoS protection.
• Proven ability to troubleshoot using pcap dumps and SIP/media analysis.
• Solid understanding of regional telecom regulations and ability to align solutions with compliance.
• Strong experience writing and maintaining technical documentation and procedures.
• Familiarity with WebRTC.
• Experience migrating large contact centers to cloud or hybrid deployments.
• Expertise with SBC Audiocodes: advanced routing, manipulation rules, HA clustering, TLS/SRTP termination, interworking.
• Genesys Cloud certification.
• A technical leader who can own and evolve VoIP services in Saudi Arabia.
• A problem solver with strong engineering intuition and risk awareness.
• A communicator skilled in negotiating with telecoms, vendors, and regulators.
• A team player who documents, mentors, and drives operational excellence.

Job Benefits

• Full-time B2B contract
• Fully remote setup, work from anywhere in Europe
• Up to 20% tax allowance
• 22 paid leave days annually
• Stock options (ESOP) in a fast-scaling, pre-IPO company
• Flexi benefits you can use for wellness, travel, or learning
• Work alongside a high-performing, international engineering team in a global fintech unicorn