Senior Full Stack Engineer, Applied Agentic AI — Frontend Dominant - USA Onsite (Mountain View, CA)

Dover; Mountain View (CA); Hybrid; USD 140,000 - 180,000; Full time

Job summary

Cogniify is hiring a Senior Full Stack Engineer with deep expertise in React and TypeScript to build enterprise product experiences that incorporate agentic AI. This is a hands-on, frontend-dominant role that also requires backend integration skills and the ability to build applications from scratch.

You will turn AI agent capabilities into polished, reliable interfaces for users. You should be comfortable working across the UI and the services behind it, including agents, tools, APIs,

Qualifications

• 6-9 years of professional software engineering experience preferred.
• Deep production experience with React and TypeScript.
• Genuine full-stack engineering capability, including backend integration and development.
• Experience building enterprise applications or substantial product features from scratch.
• A track record of shipping user-facing applications into production.

Responsibilities

• Design and build enterprise applications and product features from scratch.
• Own full-stack features from UI architecture through backend and API integration, testing, deployment, and production support.
• Build 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, including agent actions, approvals, results, status, errors, and human-in-the-loop interactions.
• Connect frontend applications with backend services, APIs, agent orchestration layers, and enterprise systems.
• Contribute to backend development when needed to deliver features end to end.
• Build and integrate agentic capabilities such as tool calling, multi-step workflows, context and state handling, retrieval, and enterprise actions.
• Provide users with appropriate controls, validation, failure states, and escalation paths in agent experiences.
• Use Codex, Claude, Claude Code, or similar AI development tools for coding, debugging, testing, and prototyping.

Skills

React

TypeScript

Full-stack engineering

API integration

Frontend architecture

Tools

LangGraph

OpenAI Agents SDK

Anthropic tooling

Codex

Claude

Job description

The Role

Cogniify is hiring a Senior Full Stack Engineer with deep expertise in React and TypeScript to build enterprise product experiences that incorporate agentic AI. This is a hands‑on, frontend-dominant role that also requires backend integration skills and the ability to build applications from scratch.

You will turn AI agent capabilities into polished, reliable interfaces for users. You should be comfortable working across the UI and the services behind it, including agents, tools, APIs, application state, and backend systems.

What You’ll Do

• Design and build enterprise applications and product features from scratch.


• Own full‑stack features from UI architecture through backend and API integration, testing, deployment, and production support.


• Build 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, including agent actions, approvals, results, status, errors, and human‑in‑the‑loop interactions.


• Connect frontend applications with backend services, APIs, agent orchestration layers, and enterprise systems.


• Contribute to backend development when needed to deliver features end to end.


• Build and integrate agentic capabilities such as tool calling, multi‑step workflows, context and state handling, retrieval, and enterprise actions.


• Provide users with appropriate controls, validation, failure states, and escalation paths in agent experiences.


• Use Codex, Claude, Claude Code, or similar AI development tools for coding, debugging, testing, and prototyping.


• Participate in product, architecture, and engineering design reviews.

What We’re Looking For

• 6 - 9 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, including backend integration and development.


• Experience building enterprise applications or substantial product features from scratch.


• A track record of shipping user‑facing applications into production.


• Hands‑on familiarity with AI agents and agentic application development.


• Understanding of multi‑step agent workflows, tool or function calling, context and state management, RAG or retrieval, and agent‑to‑API integration.


• Familiarity with agent frameworks or SDKs such as LangGraph, OpenAI Agents SDK, Anthropic tooling, or comparable technologies.


• Familiarity with Codex and/or Claude‑assisted software development.


• Strong fundamentals in software testing, debugging, performance, reliability, and production engineering.

Preferred Qualifications

• 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 or 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.

Perks And Benefits Of Working With Us

• Unlimited PTO.


• Please ask us about our very generous parental leave, much above industry standards!.


• Entrepreneurial culture where pushing limits and taking risks is everyday business.


• Open communication with management and company leadership.


• Small, dynamic teams = massive impact.


• Medical, Dental and Vision coverage for employees.


• Access to Disability & Life insurance.


• Mental health and wellbeing support


• Annual bonus program


• Employer Stock Purchase Program (ESPP)


• Yearly Team building experiences


• Mentorship and sponsorship opportunities


• Manager resources and support

We are an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or any other protected characteristic.