Senior ML Engineer - Real-Time Voice AI Agents (Hybrid)

Appfolio

San Francisco (CA)

On-site

USD 167,000 - 230,000

Full time

9 days ago

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Job summary

AppFolio is hiring a Senior Machine Learning Engineer to design and ship voice and conversational AI agents for Realm-X. You will shape production voice and chat agent pipelines, collaborating with Product, Voice, and ML Platform teams to deliver scalable, low-latency experiences across customers.

Join a team that balances advanced LLM research with practical deployment, real-time streaming, and cost-aware optimization.

Qualifications

Agent frameworks with LangChain/LangGraph/LangSmith experience.
Hands-on with Voice-to-Voice models and STT/TTS pipelines.
Strong grasp of LLM reasoning, tool use, and latency trade-offs.
Production experience with Twilio and AWS.
Expert Python skills, async programming, and WebSockets for real-time streaming.
Deep learning fundamentals; Docker/on AWS deployment.
Leadership experience guiding small teams.

Responsibilities

Ship voice and text agent pipelines for real-time interactions.
Balance reasoning depth vs. latency across models and routing strategies.
Lead a small pod of ML and platform engineers; improve observability and incident response.
Define KPIs, eval harnesses, and acceptance criteria for agent quality.
Drive fine-tuning and inference optimization for voice latency and cost.