Senior Software Engineer

Revin•New York, NY

9d•$200,000 - $275,000•Onsite

About The Position

We're hiring an Senior Software Engineer to build the production systems behind our AI agents — the agents that handle SMS, voice, and email conversations on behalf of $100M+ home-services operators. When our agent makes a mistake — books outside hours, dispatches to the wrong zip code, promises a service the business doesn't offer — it costs our customers real money. Your job is to build the systems that prevent that. This is a high-ownership role. You'll work end-to-end across a Python/FastAPI backend, a Next.js/TypeScript dashboard, and the LangGraph workflows that drive agent behavior. You'll partner directly with product, design, and leadership, ship in production, and influence the direction of the platform.

Requirements

4–8 years of full-stack experience shipping production software at a startup, high-velocity SaaS, or AI-driven company
Production LLM experience — you've shipped LLM-powered features that real customers depend on, not just prototypes or internal tools
Fluent in Python (FastAPI) and TypeScript (Next.js, React Query)
Comfortable working in multi-tenant production systems — RLS, account-scoped queries, JWT-based access
Experience debugging APIs, tracing distributed issues, and working with event-driven systems and unstructured data pipelines
A continuous learner comfortable operating in ambiguity. You ship, learn, and adapt.
Customer-obsessed — you want to be close to the people using what you build

Nice To Haves

LangGraph, LangChain, or other agent frameworks in production
Real-time voice/audio work (LiveKit, Daily.co, Twilio Voice)
Observability tooling for LLM systems (Langfuse, LangSmith, Helicone)

Responsibilities

Build and evolve LangGraph workflows that handle SMS and voice conversations for enterprise operators
Ship features end-to-end across a Python/FastAPI backend and a Next.js/TypeScript dashboard
Work in a multi-tenant Supabase/Postgres environment where every query is account-scoped (RLS, JWT-based access)
Build the eval frameworks that catch agent regressions before they reach customers — we treat eval quality as a first-class engineering discipline
Integrate with messy real-world CRMs (Salesforce, ServiceTitan, LeadPerfection, AccuLynx) where the data is never clean
Partner with the voice team on real-time agent behavior (LiveKit + OpenAI Realtime)
Optimize the omnichannel experience across SMS, voice, and email