Full Stack Software Engineer Intern [Summer 2026]

We’re looking for hackers - not just in the YC “I went to a hackathon once” sense, but also in the “I break into shit” sense.

At SubImage, we map out customer environments so that they can see misconfigurations and attack paths and fix them before they get hacked. Think about us as The Marauder’s Map from Harry Potter, but for cloud security.

If you’re a self-starter who loves learning about how things work one level deeper, you’ll enjoy this internship, and we’ll love your perspective on how to improve our product.

We’re YC-backed, open source-rooted, and small enough that you’ll work directly with the founders.

You might work on:

• Security research: find scary cloud vulns, highlight them using our product, blog/make videos about it
• Building and scaling data ingestion pipelines
• Developing AI agents for natural language search
• Modeling complex access relationships in graph databases
• A modern infra stack with Terraform and containers
• Finding ways to better present security insights in our next.js frontend
• Tech debt for days (jk)

You’ll like this if you:

• Want to build real tools that serious companies use
• Love learning about security, infra, or LLMs
• Want a public-facing portfolio of open source contributions

We’re a small team based in downtown San Francisco and this internship is fully in-person.

P.S.

If you read this thread and act on its advice, you will probably be ahead of 95% of applicants to this posting.