Fullstack Engineer

Quantum Technologies. LLC; Sunnyvale (CA); On-site; Full time

Job summary

A technology company based in California is seeking a skilled Full-Stack Engineer to build and maintain production-grade web applications while implementing AI-powered agents. You'll utilize modern technologies like React for frontend and Python for backend development, focusing on creating scalable APIs and integrating AI capabilities. This role demands a strong background in web architecture and hands-on experience with tools like LangChain and LangGraph, ensuring high code quality and effective collaboration.

Qualifications

• Strong experience with React and Python backend frameworks.
• Solid understanding of full-stack architecture and REST APIs.
• Hands-on experience using LangChain and LangGraph.

Responsibilities

• Design, develop, and maintain full-stack web applications.
• Build scalable, secure, and production-ready APIs.
• Implement AI agents using LangChain and LangGraph.

Skills

React

Python

LangChain

LangGraph

RAG architectures

Git

Job description

We are looking for a highly skilledFull-Stack Engineerwho can build and maintainproduction-grade web applicationswhile also designing and implementingAI-powered agentsusingLangChain and LangGraph.

Responsibilities

• Design, develop, and maintainfull-stack web applicationsusingReact (frontend)andPython (backend)
• Build scalable, secure, and production-readyAPIs and backend services
• ImplementAI agents and intelligent workflowsusingLangChain and LangGraph
• IntegrateLLMsinto applications, including tool-calling, memory, and multi-step reasoning
• Design and implementRAG-based solutionsusing embeddings and vector databases
• Orchestrate agent state, control flow, and execution using LangGraph
• Ensure code quality throughtesting, code reviews, and best engineering practices
  

Required Skills

• Strong experience inReact(modern hooks, component design, state management) andPython(FastAPI / Flask / Django)
• Solid understanding offull-stack architecture, REST APIs, and backend development
• Hands-on experience withLangChainfor LLM application development
• Hands-on experience withLangGraphfor building and orchestrating AI agents
• Knowledge ofRAG architectures, embeddings, and vector databases
• Proficiency withGit, version control, and collaborative development workflows

QUANTUM TECHNOLOGIES LLC is an equal opportunity employer inclusive of female, minority, disability and veterans, (M/F/D/V). Hiring, promotion, transfer, compensation, benefits, discipline, termination and all other employment decisions are made without regard to race, color, religion, sex, sexual orientation, gender identity, age, disability, national origin, citizenship/immigration status, veteran status or any other protected status. QUANTUM TECHNOLOGIES LLC will not make any posting or employment decision that does not comply with applicable laws relating to labor and employment, equal opportunity, employment eligibility requirements or related matters. Nor will QUANTUM TECHNOLOGIES LLC require in a posting or otherwise U.S. citizenship or lawful permanent residency in the U.S. as a condition of employment except as necessary to comply with law, regulation, executive order, or federal, state, or local government contract