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Today

Sr. Machine Learning Engineer

AppFolio Columbus, OH

Columbus, OH

Today

$167k - $209k/yr Full time Senior Agent Orchestration Agentic Ai

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Job Description

Build low-latency voice and conversational AI agent pipelines at AppFolio, supporting real-time, multi-channel customer interactions within Realm-X. This onsite role in Columbus, OH pairs agent systems with streaming infrastructure to help deliver experiences where quality, evaluation, and reliability matter.

What you’ll do

Architect and ship voice and text agent pipelines for real-time, multi-turn customer conversations.
Make principled trade-offs between reasoning depth and latency across frontier LLMs, smaller models, and routing strategies.
Lead a small pod of ML and platform engineers, raising the bar on agent evaluation, observability, and incident response.
Work closely with Product and Voice channel teams to define KPIs, eval harnesses, and acceptance criteria for agent quality.
Drive selective SLM fine-tuning and inference optimization to improve voice latency and cost.

What you bring

Deep, shipped experience with LangChain, LangGraph, LangSmith, and LangChain Deep Agents (or equivalent agent frameworks).
Hands-on experience with Voice-to-Voice models and traditional TTS / STT pipelines, including understanding trade-offs between end-to-end voice models and modular STT-then-LLM-TTS architectures.
Strong grasp of LLM reasoning behavior, tool use, structured output, and reasoning-vs-latency trade-offs across providers.
Production experience with Twilio (or comparable telephony) and AWS.
Expert Python, async programming, and WebSockets for real-time, bidirectional streaming.
Solid foundation in deep learning, model evaluation, and inference optimization, including the ability to deploy with Docker on AWS.
Demonstrated ability to lead a small team, mentor engineers, and partner credibly with Product and Design.
Shipped production AI agents serving real users in voice and/or text channels.
Think in pipelines and systems, move fast with sound engineering judgment, and collaborate with humility and low-ego.
Value work-life balance as a foundation for sustained high performance.

Nice to have

Experience fine-tuning Small Language Models for domain-specific voice applications.
Familiarity with RAG over structured business data and tool-using agents over API surfaces.
Prior experience in regulated or customer-facing industries with strict reliability requirements.
Publicly verifiable work on GitHub, in open-source agent frameworks, or in community competitions.

Compensation & benefits

Base pay range: USD 167,200 - 209,000 per year.
The listed compensation range does not include additional benefits or any discretionary bonuses that may apply based on role and/or employment type.
Regular full-time employees are eligible for benefits.
Final compensation is determined by factors including skills, education, experience, and internal equity.

Location: Find out more about AppFolio locations by visiting their site. All late-stage candidates complete an in-person meeting with an AppFolian as part of the hiring process. #LI-KB1

Technologies: LangChain, LangGraph, LangSmith, LangChain Deep Agents, Voice-to-Voice models, TTS, STT, Twilio, AWS, Python, WebSockets, Docker

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