Founding AI Engineer

About

• We're building the future of storytelling and video editing.
• We're a small team that moves fast and builds things we're proud of.
• We care obsessively about taste: in design, in product, in every detail.
• We're solving these hard problems.
• We're backed by a Tier-1 global fund, YC, and founders of billion dollar companies.

Engineering

Video is the most powerful way humans tell stories. It always has been. But creating it today is still painfully hard. Fragmented tools, steep learning curves, and workflows that get in the way of the actual creative work. We're building Cardboard to change that.

As a founding AI engineer in our team, you'll own the agent harness end to end. That means figuring out why a model behaves differently when a prompt shifts by a sentence, digging through conversation histories for patterns, and building your own evals and datasets to actually know if things are improving.

We want someone who has shipped real AI systems in production, not demos, but things that held up. Someone who understands LLMs deeply enough to have opinions about them. If you've worked seriously with memory, that's a big plus.

You will

• Own the agent harness, from architecture to production.
• Understand model behavior at a deep level: prompts, versions, context, and why it all matters.
• Write and maintain your own evals, benchmarks, and datasets.
• Dig through conversation histories and turn what you find into product improvements.
• Solve these problems.
• Make something people love.

What you get

• Competitive salary and founding-team equity.
• Relocation to SF, including visa / immigration support.
• A spot in our hacker house, living and building alongside the team.
• Unlimited tokens. Use whatever you want, as much as you want.
• A healthy budget for tools, monitors, laptop, and anything you need to do your best work.