Full-Stack Product Engineer — AI & Scale

Overjoy; New York (NY); Hybrid; USD 120,000 - 180,000; Full time

Benefits offered by this job

Competitive salary & equity

Health, dental, and vision (US)

Free lunch & dinner

Equipment budget

Job summary

Overjoy is building Sales AI for B2B commerce. We’re hiring a Product Engineer to work across the stack, solve hard technical problems, and ship product at scale. You’ll join a small, fast-moving team, work closely with the founders, and ship real product from day one.

This is a high-impact, zero-to-one role: you’ll be a core member of our product & engineering team. We’ve doubled revenue recently and are scaling infrastructure, integrations, and AI-driven product experiences powered by AI, with

Qualifications

• 2+ years of software engineering experience.
• Own projects end-to-end — from scoping to implementation to deployment.
• Fluent in at least one major backend or frontend stack (Python/FastAPI, Postgres, or React/TypeScript).

Responsibilities

• Solve challenging technical problems in data pipelines, AI-driven workflows, and system scalability.
• Design, implement, and deploy features end-to-end across the stack (Python/FastAPI backend, Postgres, React/TypeScript frontend).
• Architect and maintain REST APIs for CRM, Inbox, Campaigns, and Automations.
• Build production-level AI Agents using LangChain and state-of-the-art models that run critical workflows for customers.

Skills

2+ years

End-to-end ownership

Backend or frontend stack

Tools

LangChain

OpenAI models

Claude

Job description

Overjoy is building Sales AI for B2B commerce. We’re hiring a Product Engineer to work across the stack, solve hard technical problems, and ship product at scale. You’ll join a small, fast-moving team, work closely with the founders, and ship real product from day one.

This is a high-impact, zero-to-one role: you’ll be a core member of our product & engineering team. We’ve doubled revenue recently and are scaling infrastructure, integrations, and AI-driven product experiences powered by AI, with