Senior Java Full-Stack Engineer — React + AI

Ethereum Technologies; Mountain View (CA); On-site; USD 180,000 - 240,000; Full time

Job summary

Ethereum Technologies in Mountain View, CA seeks a Senior Full Stack Engineer with deep React and TypeScript expertise to build enterprise-grade product experiences and AI-enabled capabilities. This is a hands-on role requiring strong UI/product development, backend integration, and end-to-end feature ownership.

The ideal candidate translates agent capabilities into polished enterprise user experiences while understanding how agents, tools, APIs, state, and backend services work underneath the

Qualifications

• 7+ years of professional software engineering experience.
• Deep production experience with React and TypeScript.
• Full-stack capability across UI and backend/API integration.
• Experience building enterprise applications from scratch.
• Hands-on familiarity with AI agents and agentic development.
• Familiarity with agent frameworks/SDKs such as LangGraph, OpenAI Agents SDK, Anthropic tooling.

Responsibilities

• Design and build enterprise applications and product features from scratch.
• Own full-stack feature delivery from UI architecture through backend/API integration, testing, deployment, and production support.
• Build sophisticated enterprise user experiences using React and TypeScript.
• Design reusable UI components, application state patterns, workflows, and interactive experiences around AI/agent capabilities.
• Build interfaces for multi-step agent workflows, agent actions, approvals, results, status, errors, and human-in-the-loop interactions.
• Integrate frontend applications with backend services, APIs, agent orchestration layers, and enterprise systems.
• Contribute to backend development as required for end-to-end feature ownership.
• Build and integrate agentic capabilities involving tool calling, multi-step workflows, context/state, retrieval, and enterprise actions.
• Ensure agent experiences expose appropriate user controls, validation, failure states, and escalation mechanisms.
• Use Codex, Claude or similar AI-driven development workflows for coding, debugging, testing, prototyping, and development acceleration.
• Participate in product, architecture, and engineering design reviews.

Skills

React

TypeScript

Full-stack engineering

UI engineering

API integration

Testing & debugging

AI agents & agentic development

Frontend architecture

Performance & reliability

Tools

LangGraph

OpenAI Agents SDK

Anthropic tooling

Codex

Claude

Job description

Ethereum Technologies in Mountain View, CA seeks a Senior Full Stack Engineer with deep React and TypeScript expertise to build enterprise-grade product experiences and AI-enabled capabilities. This is a hands-on role requiring strong UI/product development, backend integration, and end-to-end feature ownership.

The ideal candidate translates agent capabilities into polished enterprise user experiences while understanding how agents, tools, APIs, state, and backend services work underneath the