SMS Routing Engineer – International A2P Messaging

About the role

The SMS Routing Engineer is responsible for designing, operating, monitoring and optimizing international A2P SMS routing across a large ecosystem of mobile operators, aggregators, SMS hubs and CPaaS partners. The role ensures high delivery rates, low latency, cost‑effective routing and compliance with SLAs while protecting the network from fraud and grey routes.

Key responsibilities

• Configure and maintain international SMS routing tables, including Least Cost Routing (LCR) and Quality Based Routing (QBR) strategies.
• Design priority and failover routing policies, load‑balance across multiple suppliers, and develop dynamic, country‑specific routing rules.
• Manage carrier‑hosted SMS‑FW and OTT‑FW services, investigate revenue leakages, and act as technical lead on related projects.
• Maintain traffic and monetization reports, analyze performance metrics and propose optimization initiatives.
• Manage connectivity with SMSCs, SMPP gateways, SMS hubs, SS7, SIGTRAN, Diameter, REST/HTTP APIs and WhatsApp Business APIs.
• Continuously monitor supplier performance (delivery rate, latency, TPS, error codes, DLR accuracy) and recommend routing adjustments.
• Support carrier integration, onboarding and technical troubleshooting.

Required profile

• Strong background in telecom messaging infrastructure and international SMS routing.
• Experience working with carriers, aggregators and CPaaS partners.
• Ability to analyze performance data and implement routing optimizations.

Required skills

• SMS routing tables, LCR, QBR, priority and failover routing.
• SMPP, SMSC, SMS hub connectivity.
• SS7, SIGTRAN, Diameter protocols.
• REST APIs, HTTP APIs, WhatsApp Business API.
• KPI monitoring (delivery rate, latency, TPS, error codes, DLR accuracy).
• Traffic analysis and routing cost optimization.