Senior AI/Software Engineer (Voice AI & Agent Reliability) - San Francisco

cekura • United States

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AI Summary

Build core voice AI simulation engines, LLM-powered evaluation systems, and self-improving agent pipelines at a high-growth startup. Own real-time voice infrastructure, adversarial testing, and end-to-end observability for enterprise-grade voice agents. Requires strong Python, distributed systems, and LLM evaluation expertise with a generalist mindset.

Key Highlights

Build simulation engines for voice, chat, and phone agent testing with realistic personas, noise, and edge cases

Develop LLM-powered evaluators and autonomous self-improvement loops for agent reliability

Own real-time voice infrastructure (SIP, WebRTC, Twilio, STT/TTS) with focus on latency, audio quality, and observability

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Key Responsibilities

Design and ship simulation engines for testing voice agents across voice, chat, and phone with realistic scenarios

Build LLM-powered evaluators, metrics, and closed-loop self-improvement systems for agent reliability

Develop adversarial red-teaming for jailbreaks, PII leaks, and off-script behavior detection

Implement real-time voice infrastructure (SIP, WebRTC, STT/TTS) with low-latency and high audio quality

Own end-to-end observability pipelines for production monitoring and live drift detection

Shape architectural decisions and technical standards for a small, senior engineering team

Technical Skills Required

Python Distributed Systems LLM Evaluation & Agentic Systems

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Benefits & Perks

Top-of-market cash compensation

Meaningful equity with liquidity opportunities

Zero commute tax (daily lunches/dinners, office support)

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Nice to Have

Experience with Twilio, SIP, WebRTC, Vapi, Retell, LiveKit, or Pipecat

Hands-on LLM evaluation frameworks or AI observability tools

Early-stage startup or AI/voice AI industry experience

Open-source contributions or public technical writing

Job Description

Read This FirstWe work with unusual intensity. In-person in San Francisco, six days a week, long days, most weekends. This is not a phase we'll grow out of. It's how we've chosen to build, because we're in a market where speed decides who wins.We're telling you this in the first paragraph, not the last, because we only want people who read that and feel pulled in, not talked into it. If you want a 9-to-5 (genuinely, no judgment), this isn't your role, and we'd rather you know now.

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