Senior Security Engineer - Bitcoin

Senior Security Engineer – Bitcoin PlatformBlock is Square, Cash App, Spiral, TIDAL, TBD, and our foundational teams.It all started with an idea at Block in 2013. Initially built to take the pain out of peer–to–peer payments, Cash App has gone from a simple product with a single purpose to a dynamic ecosystem, developing unique financial products to provide a better way to send, spend, invest, borrow and save to our 47 million monthly active customers.Today, Cash App has thousands of employees working globally across office and remote locations, with a culture geared toward innovation, collaboration and impact.The Cash Security team is a hands–on engineering–driven security team that embeds security engineers within key platform and product teams across Cash. As a security team, we collaborate on building and sharing security infrastructure, principles, and guidelines.As a Security Engineer embedded in Bitcoin Platform Engineering, you'll work within our Bitcoin Platform Engineering team to:Co–design, co–build, and co–own the security mechanisms and features that we use to protect the entire lifecycle of our Bitcoin holdings in production and at scale.Co–design, co–build, and co–own security mechanisms and features in our bitcoin platform production services, written in Kotlin and running on AWS.Minimum Qualifications:8+ years of experience delivering quality software.Experience writing security sensitive code or using cryptographic libraries.Familiarity with security protocols or protocol implementation.Experience with embedded systems, embedded C, firmware development or embedded security.Experience with Secure Enclaves, TrustZone, SGX, AWS Nitro enclaves, HSMs, nCipher HSMs or Codesafe.Experience building security–sensitive applications in AWS.A strong motivation to contribute to a meaningful product that will fundamentally change the way people interact with financial institutions.Strong desire to perform and grow as a security engineer, and mentor other engineers.Demonstrated technical initiative and leadership.Technologies we use and teach:Hardware Security Modules and nCipher CodeSafe application.AWS KMS.Google's Tink Cryptographic API.C programming.Additional Information:Block takes a market–based approach to pay, and pay may vary depending on your location. U.S. locations are categorized into one of four zones based on a cost of labor index for that geographic area. The successful candidate's starting pay will be determined based on job–related skills, experience, qualifications, work location, and market conditions.Full–time employee benefits include the following:Healthcare coverage (Medical, Vision and Dental insurance).Health Savings Account and Flexible Spending Account.Retirement Plans including company match.Employee Stock Purchase Program.Wellness programs, including access to mental health, 1:1 financial planners, and a monthly wellness allowance.Paid parental and caregiving leave.Paid time off (including 12 paid holidays).Paid sick leave.Learning and Development resources.Paid Life insurance, AD&D, and disability benefits.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 a proud equal opportunity employer.Block will consider qualified applicants with arrest or conviction records for employment in accordance with state and local laws and "fair chance" ordinances.Block, Inc. (NYSE: SQ) is a global technology company with a focus on financial services.

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