Retell AI
Voice AI
TelephonyEngineer
Neural analysis suggests this role is
optimal for Mid candidates.
“Telephony Engineer at Retell AI. Skills: Telephony integrations, SIP Protocol, Enterprise support. Own telephony integrations. Support enterprise telephony”
What You'll Achieve.
Improve call quality; Improve reliability; Improve customer experience; Define gold standard for AI voice infrastructure
Industry & Context.
Troubleshoot complex setups; Debug call failures
Comfortable working full-time within US Eastern Time business hours
What They're Looking For.
Must Have
5+ years as a Telephony Engineer, VoIP Engineer, low-latency networking role, deep understanding of the SIP Protocol (RFC 3261), RTP (media) debugging voice quality issues with PCAPs and trace tools, Networking fundamentals, TCP/IP/TLS, DNS, Firewalls, Ability to write or modify basic scripts, Exceptional ability to guide premium clients through complex setups, communicate technical issues clearly
Nice to Have
Familiarity with modern CPaaS/cloud communication platforms, Twilio, Plivo, Telnyx, Python, Bash, JavaScript, Familiarity with Asterisk/FreeSWITCH/Kamailio, relevant SIP proxy / SIP servers
What You'll Do.
Own telephony integrations
Support enterprise telephony
Drive post-onboarding experiences
Manage SIP integrations
Collaborate with customers
Investigate call failures
Act as technical point of contact
Translate customer feedback
How You'll Work.
Team & Collaboration
Collaborate with customers; Collaborate with development teams
Communication Scope
Communicate technical issues clearly
Full Job Description
ABOUT RETELL AI Retell AI is using first principles to reimagine the call center with cutting-edge voice AI. Thousands of companies now utilize Retell’s AI voice agents to handle sales, support, and logistics calls that once required large teams of human agents. Backed by Y Combinator, Alt Capital, and other leading investors, we have scaled to $60M ARR with a team of 40 people, up from $5M at the start of 2025. Our vision for 2026 is to build a modern CX platform where entire contact centers are powered by AI. Instead of basic automation that needs constant human tuning, we’re creating intelligent AI “workers” that can act as frontline agents, QA analysts, and managers — continuously executing, monitoring, and improving customer interactions. We’re growing quickly and looking for ambitious builders who want to tackle hard technical problems, move fast, and have real impact at one of the fastest-growing voice AI startups. - Let’s build the future together. - We’re a top 50 AI app in a16z list: a16z Top AI Apps https://tinyurl.com/5853dt2x?utm_source=chatgpt.com - #4 on Brex's Fast-Growing Software Vendors of 2025: Brex Benchmark 2025 https://www.brex.com/journal/brex-benchmark-december-2025?utm_source=chatgpt.com - We're also one of the top ranking startups on: Lean AI Leaderboard https://leanaileaderboard.com/?utm_source=chatgpt.com - Enterprise Tech 30: Wing Venture Capital ET30 https://www.wing.vc/et30/overview?utm_source=chatgpt.com ABOUT THE ROLE We are seeking a Telephony Engineer to who will own the technical success of our telephony integrations, act as the first line of defense for advanced enterprise telephony support, and drive seamless post-onboarding experiences. Your work will directly impact call quality, reliability, and customer experience. You’ll move fast, collaborate with customers, and help define the gold standard for AI voice infrastructure. KEY RESPONSIBILITIES - Integration Ownership: Manage and collaborate with customers to support complex
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