Senior Hardware Security Engineer

  • Full-time

Company Description

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. And make it easier for customers to shop and pay at their favorite businesses. 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.

Job Description

The Square Security team works to ensure the security of every transaction from swipe to receipt and beyond. We embed ourselves in other teams at Square to build world-class products for both customers and employees. Our ultimate goal is to ensure that every single experience with Square is simple, secure, and safe.

Hardware Security Engineers specialize in the physical, electrical, and embedded security concerns surrounding Square’s hardware products. We are looking for smart, motivated engineers who want to break, refine, and build amazing things with us. Hardware Security Engineers are hands-on engineers who will be involved in all areas of hardware development, from design through firmware development and prototyping through production manufacturing.

You will:

  • Design, implement, deploy, and maintain state of the art security architectures and countermeasures to protect and enable innovative new hardware products
  • Balance security, compliance, performance, power and cost for a diverse portfolio of embedded devices and the associated manufacturing and backend infrastructure
  • Evaluate the security of new product designs to determine vulnerability to physical tampering, side-channel attacks, glitching, fuzzing, and other attacks
  • Prototype and test countermeasures that defend against these attacks
  • Embed yourself amongst Hardware, Firmware, and Security Engineers to define and integrate security measures into a wide range of low cost, high quality, high volume products
  • Act as an internal security subject matter expert, advocating for better security practices throughout Square

Qualifications

You have:

  • Strong electrical engineering background, including both analog and digital domains
  • Extensive knowledge of at least one of: physical anti tamper mechanisms from initial concept to deployment and maintenance, secure boot implementations, key management, state of the art cryptographic architectures for extreme cost- and power-limited solutions
  • Demonstrated experience in at least one of the following: defeating physical anti-tamper mechanisms, performing and defending against side-channel and fault-injection attacks, and/or reverse-engineering and exploitation of embedded systems hardware and protocols

Even Better:

  • Experience taking a hardware product from concept to mass production, and an understanding of DFM and DFT considerations
  • Good understanding of cryptography, protocol design and analysis, firmware and embedded OS design principles
  • Professional software development experience in C, Ruby, Python, and/or Java
  • Software and firmware reverse-engineering
  • Experience with payment industry standards such as PCI PTS
  • Experience with other government and international security standards including those from FIPS, ISO, CC.

Additional Information

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.

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