Software Engineer Intern (Summer 2027)

About Steel

Steel is building open-source browser infrastructure for AI agents and apps . We make it easy for developers to ship AI products that interact with the web using our Sessions API .

With over 7,000 GitHub stars, dozens of paying customers, and millions of sessions served monthly, we grew our platform 50x in 2025 purely through word-of-mouth and our open-source community. Backed by world-class investors, we're building a small, highly motivated, and talent-dense team that's shaping the future of how humans interact with the internet.

More on the problems we're solving: https://docs.steel.dev/overview/intro-to-steel

The Role

• We're looking for exceptional software engineering interns to help build the infrastructure and developer tools powering the next generation of AI agents.
• You'll work alongside our engineering team on real technical challenges, from scaling browser infrastructure to building developer tools and experimenting with AI agents. We're a small team that moves fast, and you'll have the opportunity to take ownership, ship production code, and see your work used by developers building some of the most exciting applications in AI.

Sample projects include...

Building and shipping features across Steel's APIs, SDKs, and developer tools

Improving the performance and reliability of our browser infrastructure

Building open-source demos that showcase what's possible with AI agents and browsers

Experimenting with AI models, prompts, and agent frameworks to improve browser automation

Working with containers, VMs, proxies, and distributed systems to scale browser sessions

Debugging tricky engineering problems and shipping fixes that make Steel faster and more reliable

Requirements

Currently pursuing a degree in Computer Science, Software Engineering, or a related field, or have equivalent hands-on experience

Strong programming fundamentals and experience building software projects

Comfortable writing code and learning new languages, frameworks, and tools

AI-native: actively use AI coding tools and agents in your development workflow

Curious about how systems work and excited to solve challenging technical problems

Able to take ownership, move quickly, and learn independently

Able to work in person from our Toronto office

Nice-to-haves

Previous software engineering internship experience

Experience building full-stack applications, developer tools, or infrastructure projects

Contributions to open-source projects or interesting personal projects

Experience with cloud infrastructure, Linux, containers, or distributed systems

Experience building with LLMs or AI agents

Applying

If there appears to be a fit, we'll reach out to schedule 2 short technical interviews. After, we'll schedule an onsite at our Toronto office, where you'll work on a small project, discuss ideas, and meet the team.