Senior Voice Operations Engineer

The Opportunity

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.

What You’ll Own

• 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.

What You Bring

Required

• 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.

Preferred

• 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.

Other Information About This Job

• This is a full-time individual-contributor position based remotely in the United States.
• There is no standing on-call rotation. Occasional after-hours work will be required for planned deployments and maintenance windows.
• The role offers the opportunity to establish technical standards and guide fleet modernization through expertise and influence.

Compensation

The approximate range for this position is $120,000 - $130,000, depending on experience and skills.

Benefits

Lumistry offers a comprehensive benefits package, including flexible time off, medical, dental, vision, long-term disability coverage, fitness benefits, and more.

Diversity & Inclusion at Lumistry

Lumistry is an equal opportunity employer dedicated to an inclusive workplace. We prohibit discrimination and harassment based on race, color, religion, sex, sexual orientation, gender identity, national origin, disability, protected veteran status, pregnancy, or any other characteristic protected by law. This commitment applies to every part of employment, from recruiting and hiring to compensation and promotion. We base our decisions solely on qualifications, merit, and current business needs.

Accessibility

We're happy to provide reasonable accommodations for qualified individuals with disabilities during the application and interview process. If you need assistance, please reach out.