Embedded/Firmware Engineer Intern (Summer 2026)

Since we opened our doors in 2009, the world of commerce has evolved immensely, and so has Square. After enabling anyone to take payments and never miss a sale, we saw sellers stymied by disparate, outmoded products and tools that wouldn’t work together.

So we expanded into software and started building integrated, omnichannel solutions – to help sellers sell online, manage inventory, offer buy now, pay later functionality, book appointments, engage loyal buyers, and hire and pay staff. Across it all, we’ve embedded financial services tools at the point of sale, so merchants can access a business loan and manage their cash flow in one place. Afterpay furthers our goal to provide omnichannel tools that unlock meaningful value and growth, enabling sellers to capture the next generation shopper, increase order sizes, and compete at a larger scale.

Today, we are a partner to sellers of all sizes – large, enterprise-scale businesses with complex operations, sellers just starting, as well as merchants who began selling with Square and have grown larger over time. As our sellers grow, so do our solutions. There is a massive opportunity in front of us. We’re building a significant, meaningful, and lasting business, and we are helping sellers worldwide do the same.

The Role

As a Software Engineering Intern, you will work with firmware engineers on Square's Connected Hardware products. With mentorship and guidance, you'll contribute to the development, testing, and debugging of embedded software used in Square's hardware ecosystem.

This internship is designed to give you hands-on experience with real-world embedded systems, expose you to production-quality firmware, and provide you the opportunity to contribute meaningfully to products that the company ships.

You Will

• Contribute code to embedded firmware running on resource-constrained devices


• Help develop and maintain drivers, features, or system components under guidance from senior engineers


• Learn and apply best practices in embedded software development, including code reviews, documentation, and testing


• Write and run tests to validate firmware behavior and product features


• Use debugging tools to investigate and help resolve firmware issues


• Collaborate with partners such as electrical engineering, manufacturing, and quality teams


• Gain exposure to communication protocols and hardware/software integration

You Have

• Currently pursuing a BS or MS in Computer Science, Computer Engineering, Electrical Engineering, or a related field with a graduation date between May 2027 and May 2030


• Recent bootcamp graduates and engineering training participants are also considered within three months of completing program/training requirements


• Coursework or project experience in systems programming, embedded systems, or low-level software


• Experience programming in C or C++ (through coursework, labs, or personal projects)


• Familiarity with basic software engineering concepts such as version control, modular code, and debugging

Technologies We Use and Teach

• Microcontrollers, RTOS concepts, or bare-metal programming


• Communication protocols (e.g. SPI, I2C, UART, and USB)

We’re working to build a more inclusive economy where our customers have equal access to opportunity, and we strive to live by these same values in building our workplace. Block is an equal opportunity employer evaluating all employees and job applicants without regard to identity or any legally protected class. We also consider qualified applicants with criminal histories for employment on our team, and always assess candidates on an individualized basis.

We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations throughout the recruitment process. If you require an accommodation, let your recruiter know.  Want to learn more about what we’re doing to build an inclusive workplace? Check out our Inclusion & Diversity page.