We believe everyone should be able to participate and thrive in the economy. So we’re building tools that make commerce easier and more accessible to all. We started with a little white credit card reader but haven’t stopped there. Our new reader helps our sellers accept chip cards and NFC payments, and our Cash app lets people pay each other back instantly. We’re empowering the independent electrician to send invoices, setting up the favorite food truck with a delivery option, helping the ice cream shop pay its employees, and giving the burgeoning coffee chain capital for a second, third, and fourth location. Let’s shorten the distance between having an idea and making a living from it. We’re here to help sellers of all sizes start, run, and grow their business—and helping them grow their business is good business for everyone.

Our hardware team builds the tangible connection to all that is Square. As we introduce more and more of our products to the world, our hardware footprint expands. In this role, you will be responsible for developing the embedded software in Square’s hardware products.

You will: 

• Develop the embedded software in Square"s hardware products 
• Write great code within the constraints of both tiny embedded systems and much more powerful platforms
• Move up the stack to write and collaborate on system-side code; including protocol design and signal processing in iOS and Android applications, as well as kernel and other development on Linux/Android platforms

You have:

• Firmware / Embedded software development experience
• Expertise in C software development, tools, and debug
• Experience in at least one other development language (Java, C++, Ruby, Python, etc)
• Experience with 8-bit to 32-bit RISC and ARM processor
• A strong software development discipline, including modularization and test methods
• BS in CS, CE, EE, or equivalent practical experience

Even better:

• Experience in iOS or Android application development
• Experience in digital signal processing
• Understanding of common communications protocols (e.g. SPI, UART, I2C, USB), debugging practices (e.g. JTAG and associated gdb integrations), and basic electrical design principles
• Experience with ultra-low-power systems
• Ability to debug issues using a combination of software and lab equipment such as oscilloscopes and protocol analyzers
• Strong understanding of basic cryptography concepts
• Experience shipping consumer electronics products
• Experience in developing device drivers and userspace software on Linux/Android platforms
• Extensive knowledge of Linux kernel and Android system internals

At Square, we value diversity and always treat all employees and job applicants based on merit, qualifications, competence, and talent. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. We will consider for employment qualified applicants with criminal histories in a manner consistent with the requirements of the San Francisco Fair Chance Ordinance.