Senior Voice Operations Engineer

Lumistry

1d•$120,000 - $130,000•Remote

About The Position

The Senior Voice Operations Engineer will operate, maintain, and modernize the infrastructure behind Lumistry Voice. Our distributed fleet includes approximately 8,000 Linux systems, split roughly evenly between cloud-hosted virtual servers and single-board computers deployed in pharmacies. Most support LAMP applications, Asterisk, FreePBX, phone provisioning, and related telecommunications services. This is a senior individual-contributor role for someone with deep, hands-on expertise in both Linux fleet operations and low-level SIP and Asterisk technologies.

Requirements

Bachelor’s Degree in relevant field or equivalent experience.
Senior-level Linux administration and troubleshooting experience across a large or highly distributed production fleet.
Deep production experience with Asterisk, FreePBX, SIP, RTP, SDP, and IP telephony, including the ability to read raw SIP messages, packet captures, dialplans, and end-to-end call flows.
Strong knowledge of TCP/IP, UDP, DNS, DHCP, NAT, routing, firewalls, VLANs, TLS, certificates, and Linux networking.
Experience managing enterprise SIP phones, provisioning templates, firmware, carrier trunks, number routing, and telecommunications escalations.
Strong Bash, Python, or comparable scripting skills, with experience using Git and configuration-management tooling.
Sound production judgment, clear communication, strong documentation habits, and a collaborative, team-first approach.
A customer-focused, driven, curious, and accountable mindset.
This position requires significant depth in both Linux and VoIP. Expertise in only one will not be sufficient.

Nice To Haves

Yealink or similar enterprise phone provisioning.
Kamailio, OpenSIPS, FreeSWITCH, SIP proxies, or session border controllers.
Puppet or similar fleet-management tooling, package repositories, and modern observability platforms.
Experience modernizing legacy Linux, LAMP, Asterisk, or FreePBX environments.
Healthcare, pharmacy, HIPAA, or another security- and privacy-sensitive environment.

Responsibilities

Operate, secure, patch, and maintain approximately 8,000 Linux systems and the LAMP and voice services running on them.
Manage phone provisioning templates, configuration generation, firmware, certificates, and remote deployments across multiple phone models.
Support carrier-grade SIP infrastructure, including trunks, session border controllers, DIDs, routing, failover, E911, STIR/SHAKEN, caller ID, and carrier escalations.
Automate fleet management, configuration, deployments, and recovery using scripting, configuration-management tools, APIs, Git, and CI/CD.
Improve monitoring, alerting, runbooks, incident response, and root-cause analysis while eliminating recurring problems.
Plan and execute safe, staged deployments and maintenance with clear validation and rollback procedures.
Troubleshoot Asterisk, FreePBX, SIP, SDP, RTP, registrations, routing, transfers, IVRs, queues, voicemail, DTMF, NAT, and audio issues using logs, packet captures, and command-line tools.
Collaborate with Voice Engineering, Platform Services, Customer Operations, Support, Product, and external telecommunications partners.