Production LLM Agent Engineer: Voice & Telephony

present of AI; United Kingdom; On-site; GBP 65,000 - 90,000; Full time

Job summary

PolyAI in the United Kingdom is seeking a mid-level engineer who has built and shipped LLM agents to real users. You will own customer agents from scoping through production, handle tool calls, and debug live calls across speech recognition, models, prompts, and telephony integrations.

You should write solid Python, integrate enterprise systems and telephony, run eval sets and A/B tests, and communicate trade-offs clearly to engineers and executives. This is hands-on, production-focused work.

Qualifications

• Shipping LLM agents in production.
• Strong Python skills.
• Experience integrating with telephony systems.
• Ability to run eval sets and online experiments.

Responsibilities

• Own customer agents from scoping to production.
• Debug live calls across speech, model, prompts, and lines.
• Explain trade-offs clearly to engineers and executives.
• Implement tool calls and guardrails for agent behavior.

Skills

LLM agents

Python

Telephony integration

Production debugging

A/B testing

Tools

SIP

Telephony platforms

Job description

PolyAI in the United Kingdom is seeking a mid-level engineer who has built and shipped LLM agents to real users. You will own customer agents from scoping through production, handle tool calls, and debug live calls across speech recognition, models, prompts, and telephony integrations.

You should write solid Python, integrate enterprise systems and telephony, run eval sets and A/B tests, and communicate trade-offs clearly to engineers and executives. This is hands-on, production-focused work.