Fullstack Engineer

Ethereum Technologies LLC; Sunnyvale (CA); On-site; USD 100,000 - 130,000; Full time

Job summary

A tech company in Sunnyvale is seeking a highly skilled Full-Stack Engineer to design, develop, and maintain production-grade web applications using React and Python. The ideal candidate will also implement AI-powered agents utilizing LangChain and LangGraph. Responsibilities include building secure APIs, ensuring code quality through testing, and orchestrating AI workflows. This opportunity offers a dynamic work environment in the heart of California, with a strong focus on innovative technology and collaboration.

Qualifications

• Strong experience in React (modern hooks, component design, state management) and Python (FastAPI / Flask / Django).
• Solid understanding of full-stack architecture and backend development.
• Hands-on experience with LangChain for LLM application development.

Responsibilities

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

Skills

React

Python

LangChain

LangGraph

REST APIs

Git

Job description

We are looking for a highly skilledFull-Stack Engineer who can build and maintainproduction-grade web applications while also designing and implementingAI-powered agents usingLangChain and LangGraph.

Responsibilities

• Design, develop, and maintainfull-stack web applications usingReact (frontend) andPython (backend)
• Build scalable, secure, and production-readyAPIs and backend services
• ImplementAI agents and intelligent workflows usingLangChain and LangGraph
• IntegrateLLMs into applications, including tool-calling, memory, and multi-step reasoning
• Design and implementRAG-based solutions using 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 withLangChain for LLM application development
• Hands-on experience withLangGraph for building and orchestrating AI agents
• Knowledge ofRAG architectures, embeddings, and vector databases
• Proficiency withGit, version control, and collaborative development workflows

ETHEREUM 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. ETHEREUM 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 ETHEREUM 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