Senior VoIP Engineer, Axon 911

About the role

Axon 911's Carbyne Voice team is building the infrastructure that handles emergency calls — in the cloud. This is not a monitoring layer on top of existing telephony; it is the actual call-handling engine, responsible for every packet, every route, and every millisecond of uptime in a life-critical system.

This is a hybrid role, with an expectation of four days per week in our Manhattan office.

Responsibilities

• Design and develop cloud-based voice infrastructure handling SIP routing, call state management, and redundancy for emergency 911 systems
• Build and maintain integrations with telephony providers, PSAPs, and external partners, ensuring end-to-end call reliability in production environments
• Drive major features and architectural evolution of the voice platform
• Collaborate closely with operations, networking, and engineering teams to ensure system visibility, reliability, and alignment on infrastructure changes
• Participate in on-call rotations or incident response for production voice infrastructure, given the zero-failure requirement of the system

Requirements

• Deep experience with VoIP/UC systems and SIP protocol. You have written or integrated SIP-based applications and can speak fluently about the protocol's behavior
• Cloud platform experience, ideally AWS. You understand how to build distributed, fault-tolerant systems in the cloud, not just in hardware-based telecom infrastructure
• Familiarity with open-source VoIP tools such as FreeSWITCH and Kamailio. Direct experience with these is a strong signal; adjacent experience is welcome
• Comfort operating in a highly cross-functional environment. You work fluidly with networking, operations, and product teams and communicate technical complexity clearly

Qualifications

• We believe this role requires someone who thrives under meaningful responsibility. Someone who understands that every call handled well is an opportunity to help, support, and ultimately save lives

Skills

• Strong understanding of VoIP protocols and technologies
• Experience with cloud-based infrastructure and services
• Ability to work in a highly collaborative and cross-functional team environment

Benefits

• Competitive salary and 401k with employer match
• Discretionary time off
• Paid parental leave for all
• Medical, Dental, Vision plans
• Fitness Programs
• Emotional & Development Programs
• Snacks in our offices

Pay

$141,000 - $216,600 USD

Schedule

Hybrid role, with an expectation of four days per week in our Manhattan office.