NYC Onsite: Full-Stack AI Engineer (Zero-to-One)

Keystone Distinction Group; New York (NY); On-site; USD 120,000 - 200,000; Full time

Job summary

Keystone Distinction Group is partnering with a cutting-edge NYC startup to hire a Full Stack AI Engineer. The role is fully onsite in Manhattan, requiring daily in-office work five days a week, with ownership of AI-powered product development from concept to production.

You will collaborate with founders, own frontend and backend stacks, and architect AI-enabled systems across tools, embeddings, and real-time interactions. Expect rapid iteration in a startup environment.

Qualifications

• 4 or more years of professional software engineering experience.
• Proven experience building and launching a product from zero to one.
• Prior experience working at an early-stage startup.
• Strong experience across frontend and backend development.
• Strong skills in TypeScript, JavaScript, React, and Next.js.
• Backend experience with Node.js, Python, FastAPI, Go, or similar technologies.
• Experience with PostgreSQL, APIs, cloud infrastructure, and production deployments.
• Hands-on experience integrating large language models into production applications.
• Experience with AI agents, RAG, tool calling, embeddings, multimodal AI, or voice AI.
• Strong product judgment and the ability to operate with limited direction.
• Ability to move quickly while maintaining high engineering standards.
• Must be actively hands-on and writing production code.

Responsibilities

• Build, test, launch, and improve full-stack products from zero to one
• Develop modern frontend applications using React, Next.js, or similar technologies
• Build backend services, APIs, databases, and third-party integrations
• Create AI-powered features using large language models and multimodal models
• Build AI agents that can use tools, complete workflows, and interact with external systems
• Develop retrieval-augmented generation, embeddings, vector search, and knowledge systems
• Integrate voice AI, speech-to-text, text-to-speech, or real-time conversational systems
• Implement structured outputs, tool calling, model routing, and human approval workflows
• Build evaluation, monitoring, and testing systems for AI performance
• Improve application reliability, scalability, security, latency, and AI inference costs
• Work directly with founders, users, and product stakeholders
• Help make product, architecture, and technology decisions

Skills

TypeScript

JavaScript

React

Next.js

Node.js

Python

AI systems

Tools

PostgreSQL

APIs

Cloud infrastructure

Docker

AWS/GCP/Azure

Job description

Keystone Distinction Group is partnering with a cutting-edge NYC startup to hire a Full Stack AI Engineer. The role is fully onsite in Manhattan, requiring daily in-office work five days a week, with ownership of AI-powered product development from concept to production.

You will collaborate with founders, own frontend and backend stacks, and architect AI-enabled systems across tools, embeddings, and real-time interactions. Expect rapid iteration in a startup environment.