Founding Engineer & Head of Engineering

JobCubby; San Francisco, Northern (CA, KY); Hybrid; USD 180,000 - 320,000; Full time

Job summary

JobCubby is a seed-stage AI agent marketplace startup. We're seeking a founding, executive-level engineer to own the infrastructure behind a platform where AI agents compete to complete real user tasks.

You’ll set the engineering direction, define the culture, and build hands-on with a small but growing team. This on-site role in San Francisco offers a unique chance to shape the engineering organization for 50+ hires.

Qualifications

• You've built something 0→1 before, not just maintained or scaled existing systems.
• Hands-on full-stack proficiency across React/Vue, Go/Node.js/Python, and data stores.
• Strong opinions on database design, system scale, and reliability.
• Ship-first mindset with a track record of delivering usable work.

Responsibilities

• Own the agent infrastructure and full stack (frontend, backend, data layer).
• Make architecture calls: database design, scalability, uptime strategies.
• Transform AI-assisted coding into a team-wide practice with libraries and standards.
• Engage directly with users and be the technical voice of reason.
• Set engineering culture, hiring bar, processes, and norms that scale.

Skills

React

Vue

Go

Node.js

Python

MySQL

Redis

Full-stack

Architecture

Job description

About the Role

This is a founding, executive-level engineering role at a seed-stage AI agent marketplace startup. You won't just keep the lights on - you'll own the infrastructure behind a platform where AI agents compete to complete real user tasks. You'll set the engineering direction, define the culture, and build hands-on alongside a small but growing team. Whoever joins now will shape the engineering organisation for the next 50+ hires.

This role is on-site in San Francisco. Visa sponsorship is not available.

What You'll Do

• Own the agent infrastructure and full stack - front end (React/Vue), back end (Go/Node.js/Python), and data layer (MySQL, Redis).
• Make the architecture calls: database design, scalability strategy, and uptime - from first principles, not inherited playbooks.
• Transform AI-assisted coding from an individual habit into a team-wide practice - prompt libraries, skill templates, and review standards that everyone runs on.
• Talk directly to users and serve as the technical voice of reason: knowing when a good idea is actually a bad one to ship.
• Set the engineering culture from the ground up - hiring bar, processes, and norms that scale to 50+ engineers.

What We're Looking For

Required

• You've built something 0→1 before - not just maintained or scaled an existing system.
• Hands-on full-stack proficiency across the stack: React or Vue, Go or Node.js or Python, MySQL, Redis.
• Strong opinions on architecture: database design, system scale, and reliability.
• You care deeply about shipping work that actually gets used - not just checked off a roadmap.

Nice to Have

• You've shipped an AI-native product before.
• You contribute to open source.

About the Company

This is a seed-stage startup (Series A/B-adjacent angel + VC backing) operating at the intersection of AI and marketplace infrastructure. The platform hosts tens of AI agents and serves a six-figure user base. The company was founded in 2023, has a team of 12+, and is backed by 30+ angels and notable institutional investors in the AI and Web3 space.

Location & Work Arrangement

• On-site in San Francisco, CA - remote work is not available for this role.
• Visa sponsorship: not available.