# Senior Software Engineer, Backend (AI)

**Company:** [Posh](https://hotfix.jobs/companies/posh)
**Location:** New York, NY
**Role:** Backend Engineering
**Salary:** $200k – $225k/yr
**Experience:** 3+ years
**Skills:** Python, Terraform, GCP, AWS, Azure, Docker, Kubernetes, TypeScript, Node.js, LangGraph
**Posted:** 2026-02-09

> Senior Backend Engineer building scalable AI services and multi-agent systems in Python. Owns cloud infrastructure with Terraform and optimizes AI model performance, latency, and cost.

## Job Description

## Responsibilities
- Design, build, and maintain scalable backend services and APIs for AI-powered features, writing primary production code in Python
- Design and implement complex, hierarchical Multi-Agent Systems that perform sophisticated, multi-step tasks
- Build robust frameworks to evaluate AI system quality and manage fine-tuning pipelines
- Define, deploy, and manage AI infrastructure using Terraform; scale container-based serverless solutions
- Analyze tradeoffs between model performance, latency, and cost for managed AI services
- Collaborate with frontend engineers and product designers; occasionally work in TypeScript (Node.js) to integrate AI features

## Requirements
- 3–6+ years of backend or full-stack engineering experience with a track record of shipping scalable systems
- Deep expertise in Python and its ecosystem for web services and data processing
- Strong experience with Infrastructure as Code (Terraform), a major cloud platform (GCP, AWS, or Azure), and deploying containerized applications
- Ability to work in a lean, fast-paced R&D environment defining new playbooks for AI-native experiences

## Nice-to-Haves
- Familiarity with managed AI services (Vertex AI, AWS Bedrock), LLMs, or building advanced AI systems
- Experience with model evaluation frameworks (RAGAs, LangSmith, DeepEval) or fine-tuning
- Experience with open-source agentic frameworks (LangGraph, CrewAI, Strands)
- Background in MLOps, data engineering, or consumer/marketplace/event-driven platforms

## Benefits & Compensation
- Competitive salary: $200,000–$225,000
- 5-day onsite commitment at NYC SoHo office

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