Junior Infrastructure Engineer — Build Reliable Dev Backends

Wwshemi; United States; Remote; USD 90,000 - 120,000; Full time

Job summary

Expo is an agentic mobile infrastructure platform for building, shipping, and running native apps for iOS, Android, and the web. Millions of developers rely on Expo's open-source framework and cloud services to go from idea to production, with tools to build, submit to app stores, ship updates, and monitor performance at scale.

We're seeking an early-career engineer to join the EAS infrastructure team, learning to design, build, and operate backend systems, while owning code quality, tests, and

Qualifications

• You're curious about Linux, containers, and writing small services, and you have some experience with each.
• You've built something real, end to end, with users or real load on it.
• You're comfortable with virtual machines and containers.
• You have cloud experience. We use Google Cloud, but deep experience with AWS, Azure, or a home lab carries over well.
• You have the knowledge taught in courses on operating systems, networks, databases, and distributed systems, whether you learned it in school or on your own.
• You've gone deep on at least one low-level area: the operating system, the network, a cloud, or the deploy path.
• You're comfortable writing code and want to write a lot more of it.
• Bonus: systems-level knowledge of macOS or networking.
• You make sound decisions on your own and bring new, effective ideas to improve how app software is built and distributed.
• You write services that stay healthy long after you've moved on to your next project.
• You respond quickly to teammates so Expo keeps making fast, steady progress.
• You get yourself unstuck and help others get unstuck too.
• You know why well-designed tools and APIs matter, and you ship well-designed, well-tested features quickly.
• You communicate ideas and code clearly through documentation, GitHub reviews, blog posts, and other writing.
• You understand the problems and goals of Expo's users and think about them every day.
• You use agents for real work every day, and you can explain what you checked before you trusted the result.
• You get better every week. You're curious and focused, and you own what you run.

Responsibilities

• Join EAS's infrastructure team as an early-career engineer, working alongside a senior engineer.
• Learn to design, build, and operate the backend infrastructure behind our developer-facing services, on our Linux fleet and cloud foundation.
• Build internal improvements that make our services easier to manage, faster, and cheaper to run, and make Expo a better place to work.
• Write software that runs correctly and efficiently, and own its uptime and performance.
• Own the code you write: add tests and monitoring, and join your team's on-call rotation.

Skills

Linux

Containers

Small services

Cloud experience

Code writing

Education

Operating systems

Computer networks

Databases

Distributed systems

Tools

Google Cloud

AWS

Azure

Virtual machines

Job description

Expo is an agentic mobile infrastructure platform for building, shipping, and running native apps for iOS, Android, and the web. Millions of developers rely on Expo's open-source framework and cloud services to go from idea to production, with tools to build, submit to app stores, ship updates, and monitor performance at scale.

We're seeking an early-career engineer to join the EAS infrastructure team, learning to design, build, and operate backend systems, while owning code quality, tests, and