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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

AppFolio is hiring a Sr. Machine Learning Engineer in Columbus, OH to help design and deliver voice and conversational AI agent pipelines within Realm-X. The role centers on low-latency, multi-channel experiences that combine LLM agent frameworks, real-time voice capabilities, and streaming infrastructure.

What you will do

Architect and ship voice and text agent pipelines for real-time, multi-turn customer conversations.
Make well-reasoned 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 across agent evaluation, observability, and incident response.
Work with Product and Voice channel teams to define KPIs, build evaluation harnesses, and establish agent quality acceptance criteria.
Drive selective Small Language Model (SLM) fine-tuning and inference optimization to improve voice latency and reduce 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 the trade-offs between end-to-end voice models and modular STT LLM TTS architectures.
Strong understanding 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 deployment with Docker on AWS.
Proven ability to lead a small team, mentor engineers, and partner effectively with Product and Design.
Experience shipping production AI agents serving real users in voice and/or text channels.
Systems-oriented thinking (pipelines and architecture, not only models) plus fast execution with sound engineering judgment.
Collaborative, low-ego approach that elevates others, with an emphasis on sustainable work-life balance.

Technologies

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

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, open-source agent frameworks, or in community competitions.

Location

Columbus, OH (onsite).

Find out more about locations by visiting the company site. All late-stage candidates complete an in-person meeting with an AppFolian as part of the hiring process.

Compensation & benefits

Salary range: USD 167,200 - 209,000 per year (base pay).
The actual compensation will be determined by factors including skills, education, experience, and internal equity.
Regular full-time employees are eligible for benefits.

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