Senior Software Engineer-SIP, Golang, C++

At Motorola Solutions, we believe that everything starts with our people. We’re a global close-knit community, united by the relentless pursuit to help keep people safer everywhere. We build and connect technologies to help protect people, property and places. Our solutions foster the collaboration that’s critical for safer communities, safer schools, safer hospitals, safer businesses, and ultimately, safer nations. Connect with a career that matters, and help us build a safer future.

Key Responsibilities:

• Design and architect high-throughput, stateless SIP microservices using Go, achieving strict performance targets such as 5,000+ TPS and sub-15ms latency budgets.

• Implement complex protocol translation layers to convert inbound SIP-over-TCP/TLS traffic from load balancers into high-speed SIP-over-ZeroMQ traffic for internal stateless services.

• Engineer advanced concurrency models utilizing ZeroMQ Router/Dealer socket pooling and internal thread-bridging patterns to prevent mutex bottlenecks and ensure thread-safe message passing under heavy load.

• Integrate distributed state and security mechanisms, including automated cryptographic key rotation using discovery tools for leader election and secured vaults for private key storage.

• Enforce surge protection and reliability by building multi-layered throttling, distributed batch schedulers, and exponential backoff handling

• Partner with Network and Infrastructure teams to define advanced load balancer routing frameworks, DNS SRV query logic, and implement distributed tracing (OpenTelemetry) for end-to-end observability.

Required Skills & Experience:

• Knowledge of SIP/VOIP & related telecom protocols.

• Deep hands-on experience in Golang (preferred) and proficiency in c++/c

• Strong computer science fundamentals, data structures, and algorithms.

• Deep understanding of distributed systems, multi-threading, concurrency control, stateless proxies and Finite State Machines (FSM).

• Hands-on expertise with networking and messaging protocols including gRPC and RabbitMQ.

• Strong background with distributed databases like Apache Ignite and GridGain.

• Practical knowledge of persistence and caching solutions such as PostgreSQL, Redis, and ElasticSearch.

• Excellent written and verbal communication skills for technical documentation and explaining complex ideas.

• Industry Experience - 8+ years

EEO Statement

Motorola Solutions is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion or belief, sex, sexual orientation, gender identity, national origin, disability, veteran status or any other legally-protected characteristic. 

We are proud of our people-first and community-focused culture, empowering every Motorolan to be their most authentic self and to do their best work to deliver on the promise of a safer world. If you’d like to join our team but feel that you don’t quite meet all of the preferred skills, we’d still love to hear why you think you’d be a great addition to our team.