Java Full Stack Engineer With React and AI

Quantum Technologies. LLC; Mountain View (CA); On-site; USD 140,000 - 190,000; Full time

Job summary

Quantum Technologies. LLC in Mountain View, CA is seeking a Senior Java Full Stack Engineer with deep frontend expertise in React and TypeScript to build enterprise-grade product experiences with agentic AI capabilities.

This hands-on role requires strong UI/product development, backend integration, and experience delivering end-to-end features from scratch. Ideal candidates have 7+ years of experience and a proven track record shipping production applications with AI agents.

Qualifications

• 7+ years of professional software engineering experience.
• Deep production experience with React and TypeScript.
• Strong frontend architecture, UI engineering, API integration, and testing.
• Full-stack capability including backend work and production shipping.
• Experience with AI agents and agentic development.

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.

Skills

React

TypeScript

Full-stack engineering

UI engineering

API integration

AI agent experience

Testing

Education

Bachelor's degree in CS or related field

Tools

Java

Node.js

Kotlin

OpenAI SDK

Anthropic tooling

Job description

Java Full Stack Engineer With React and AI

Location:

Mountain View, CA

Duration:

12Months+ Extension

Domain Exposure:

Work Authorization:

We are looking for a Senior Full Stack Engineer with deep frontend expertise in React and TypeScript to build enterprise-grade product experiences incorporating agentic AI capabilities. This is a hands-on engineering role requiring strong UI/product development skills, backend integration capability, and experience building applications from scratch.
The ideal candidate can translate agent capabilities into polished enterprise user experiences while also understanding how agents, tools, APIs, state, and backend services work underneath the UI.
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/Claude Code, or similar AI-driven development workflows for coding, debugging, testing, prototyping, and development acceleration.
• Participate in product, architecture, and engineering design reviews.

Required Experience

• 7+ years of professional software engineering experience preferred.
• Deep production experience with React and TypeScript.
• Strong frontend architecture, UI engineering, application state management, API integration, and testing experience.
• Genuine full-stack engineering capability rather than frontend-only development.
• Demonstrated experience building enterprise applications or substantial product capabilities from scratch.
• Strong experience shipping user-facing applications into production.
• Hands-on familiarity with AI agents and agentic application development.
• Understanding of multi-step agent workflows, tool/function calling, context/state management, RAG/retrieval, and agent-to-API integration.
• Familiarity with agent frameworks/SDKs such as LangGraph, OpenAI Agents SDK, Anthropic tooling, or comparable technologies.
• Familiarity with Codex and/or Claude-driven software development.
• Strong software testing, debugging, performance, reliability, and production engineering fundamentals.

Preferred

• Backend experience with Java/Kotlin, Python, Node.js, or comparable production technologies.
• Experience designing human-in-the-loop agent interfaces and complex workflow UIs.
• Experience with real-time/streaming AI interfaces and long-running workflows.
• Experience with agent evaluation, observability, guardrails, and failure handling.
• Experience building SaaS, financial, or other enterprise applications where reliability and user control are important.

We are an equal opportunity employer. All aspects of employment including the decision to hire, promote, discipline, or discharge, will be based on merit, competence, performance, and business needs. We do not discriminate on the basis of race, color, religion, marital status, age, national origin, ancestry, physical or mental disability, medical condition, pregnancy, genetic information, gender, sexual orientation, gender identity or expression, national origin, citizenship/ immigration status, veteran status, or any other status protected under federal, state, or local law.