Senior Voip Engineer

Blue Lynx; United States; Remote; USD 140,000 - 190,000; Full time

Benefits offered by this job

Remote work

Flexible hours

Global team

Job summary

Blue Lynx is seeking a Senior VoIP Engineer for Voice AI and new product development. You will own end-to-end VoIP systems, drive architecture decisions, and ship production-ready features.

The role emphasizes designing VoIP apps with Asterisk/OpenSIPS, building Java services, and shipping new voice products while ensuring security and high availability in a remote US-based setup.

Qualifications

• Fluent in English (written and spoken).
• Experience with ringless voicemail (RVM).
• Open-source contributions in voice/telephony or audio AI.
• Strong Java programming skills, ideally with Spring.
• Experience with Asterisk v22 (dialplan, ARI/AMI, PJSIP).
• Solid SIP/RTP networking and NAT traversal knowledge.
• GCP expertise: Compute Engine, VPC, load balancing, monitoring.
• Understanding of distributed systems, microservices, high availability.
• Experience with voice AI systems in production; CI/CD familiarity.

Responsibilities

• Design, develop, and maintain VoIP apps with Asterisk/OpenSIPS.
• Build backend services and integrations using Java/Spring Boot.
• Design and ship voice products (RVM, branded calling, routing).
• Implement SIP routing, call flows, STIR/SHAKEN, media handling.
• Develop REST/ARI-based services and telephony workflow automation.
• Troubleshoot SIP/RTP issues and optimize performance.
• Deploy and manage VoIP infra on Google Cloud Platform.
• Ensure SIP security, resiliency, and high availability.
• Collaborate with DevOps, networking, and QA teams.

Skills

English fluency

Java

VoIP engineering

Ringless voicemail (RVM)

Voice AI exposure

CI/CD experience

Problem solving

SIP/RTP knowledge

Tools

Asterisk v22

OpenSIPS

PJSIP

Spring Boot

Google Cloud Platform

ARI/AMI

REST/ARI services

Jenkins/Bitbucket Pipelines

Job description

Our client is a fast-growing, technology-driven company operating in the AI communication space, helping businesses streamline customer interactions through intelligent, real-time messaging solutions. Currently expanding, they are looking for a driven Senior VoIP Engineer Voice AI & New Product Development to own systems end-to-end, make architecture decisions that matter, and ship to production.

Job Profile for Senior VoIP Engineer Voice AI & New Product Development

• Design, develop, and maintain VoIP applications and services using Asterisk 22, OpenSIPS, and supporting technologies
• Build backend services and integrations using Java (Spring Boot preferred)
• Design and ship new voice products — including ringless voicemail, branded calling, and advanced routing
• Implement SIP routing, call flows, dialplans, STIR/SHAKEN, media handling, andcustom modules when needed
• Develop and maintain REST/ARI-based services and automation for telephonyworkflows
• Optimise system performance, troubleshoot SIP/RTP issues, and analyse packet-level traffic
• Deploy, monitor, and manage VoIP infrastructure on Google Cloud Platform —scalability via MIGs, networking, load balancing, infrastructure-as-code
• Ensure SIP security, fraud prevention, resiliency, and high availability
• Collaborate with cross-functional teams across DevOps, networking, and QA

Candidate Profile for Senior VoIP Engineer Voice AI & New Product Development

• Must be fluent in English, both written and spoken
• Hands-on experience with ringless voicemail (RVM)
• Open-source contributions in voice/telephony or audio AI
• Strong Java programming skills, ideally with Spring or similar frameworks
• Hands-on experience with Asterisk v22 — dialplan, ARI/AMI, PJSIP, audio codecs
• Solid networking knowledge — SIP, RTP, TCP/UDP, NAT traversal, QoS, DNS, TLS firewalls, packet analysis (tcpdump, Wireshark)
• Strong experience with Google Cloud Platform — Compute Engine, VPC, load balancing, Cloud Logging/Monitoring, networking, Linux administration, shell scripting, and performance tuning
• Understanding of distributed systems, microservices, and high-availability architecture
• Hands-on experience building, integrating, or operating voice AI systems (TTS, STT, real-time conversational AI) in production
• Familiarity with CI/CD pipelines (Bitbucket Pipelines, Cloud Build, Jenkins) is beneficial
• 5+ years of VoIP engineering experience, with hands-on voice AI exposure in production
• Prior experience at a CPaaS, telco, or voice infrastructure company
• Experience with OpenSIPS — SIP routing, modules, registrar, dispatcher, scripting
• Experience with STIR/SHAKEN implementation (Asterisk or OpenSIPS)
• Strong problem-solving — you debug complex SIP/RTP issues

What Our Client Offers

• Competitive compensation aligned with the experience
• Opportunity to work in a fast-growing AI company with a global footprint and a high-impact product used by businesses worldwide
• Remote setup with a globally distributed team, operating across multiple continents
• Flexible working hours focused on outcomes
• Exposure to a fast-scaling AI product used by thousands of businesses globally
• Opportunity to work closely with founders and senior leadership
• Real ownership and impact in a high-growth environment

Please note: Candidates may be required to present references and diplomas, and have a background check

We are an Equal Opportunity Employer and value diversity at our company. We do not discriminate on the basis of race, colour, religion, sex, sexual orientation, gender identity, national origin, disability, veteran status, or any other protected characteristic under applicable federal, state, or local laws.

Applicants must be legally authorised to work in the United States. At this time, we are unable to provide visa sponsorship for this position.

This is a remote role; however, candidates must reside in and be eligible to work from the United States. Employment may be subject to location-based requirements due to payroll, tax, or regulatory considerations, and certain states may be excluded depending on business needs.

Employment is contingent upon the successful completion of background checks and any applicable security or compliance screening, consistent with the nature of the role and industry requirements.

All employment is at-will, meaning either the employee or the employer may terminate the employment relationship at any time, with or without cause or notice, subject to applicable law.