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# Sr/Staff Backend Engineer - Perm - Relocation to SF

- **Company:** Arc Full-time
- **Location:** San Francisco, CA, United States (Remote available)
- **Experience:** Expert
- **Salary:** $245,000.0
- **Contract:** Permanent contract
- **Skills:** Artificial Intelligence, Systems Engineering, Automated Storage and Retrieval Systems, Content Analysis, Data Mining, Distributed Systems, Information Extraction, Information Retrieval, Machine Learning, Performance Tuning, Search Technologies, Systems Architecture, Enterprise Search, Data Processing, Large Language Models, Multi-Agent Systems, Backend, Agentic-AI, Build Management, AI Platforms, Machine Learning Operations, Data Pipelines
- **Published:** October 9, 2026
- **Apply:** https://arc.dev/signup?userType=developer&publicRandomKey=pq2vlwxisq&to=https%3A%2F%2Farc.dev%2Fdashboard%2Fd%2Fverified-jobs%2Fpq2vlwxisq%2Fapplication

## About the Role

Node.jsRAGLLMJavaScriptDistributed Systems Engineering, * Significant professional experience building backend software for production environments with a strong focus on scalable, distributed systems.

 * Proven experience designing and maintaining large-scale backend services and data processing infrastructure.
 * Experience building systems involving LLMs, AI pipelines, retrieval systems, search technologies, or large-scale document processing.
 * Strong understanding of system architecture, scalability, reliability, and performance optimization.
 * Experience collaborating across engineering and product teams to deliver customer-focused software.
 * Demonstrated ability to balance engineering excellence with practical business impact.
 * Strong ownership mindset, resourcefulness, and ability to execute effectively in fast-moving environments., * Experience working in a startup or other high-growth technology company.
 * Experience building AI-native or machine learning-powered applications.
 * Familiarity with document intelligence, knowledge retrieval, or enterprise search platforms.
 * Interest in helping build and scale an engineering organization during a period of rapid growth.

## Description

As a Senior Backend Engineer, you'll develop the core infrastructure behind an AI-native platform that processes and analyzes millions of documents.

You'll help build reliable, scalable backend systems that enable advanced AI capabilities while collaborating with cross-functional teams to turn emerging technologies into production-ready solutions.

What You'll Build

 * Design and build backend systems that reliably process and analyze millions of complex documents.
 * Develop scalable pipelines that orchestrate large language models (LLMs), structured data extraction, and document analysis workflows.
 * Build high-performance search and retrieval systems focused on accuracy, scalability, and speed.
 * Improve the technical foundation of a rapidly growing AI platform.
 * Partner with product, engineering, and domain experts to deliver new AI-powered capabilities.
 * Help evaluate and implement new AI technologies as the landscape continues to evolve., #Artificial Intelligence
 * Large Language Models (LLMs)
 * Agentic Retrieval-Augmented Generation (RAG)
 * AI orchestration
 * Document intelligence

Backend

 * Distributed systems
 * Backend services
 * Scalable data processing pipelines

Search & Data

 * Search and retrieval systems
 * Structured data extraction
 * Document clustering
 * Large-scale document processing