Senior Security Engineer, Block

Bitcoin Platform

$168.3-297k

Salary is dependent on location. + Equity plan subject to the terms of the applicable plans and policies

AWS

Kotlin

Senior and Expert level

Remote in US

San Francisco Bay Area

Financial services ecosystem

Job no longer available

Financial services ecosystem

1001+ employees

FintechB2CB2BPaymentsFinancial Services

Job no longer available

$168.3-297k

Salary is dependent on location. + Equity plan subject to the terms of the applicable plans and policies

AWS

Kotlin

Senior and Expert level

Remote in US

San Francisco Bay Area

1001+ employees

FintechB2CB2BPaymentsFinancial Services

Company mission

To create better tools to help everyone access the economy.

Job

Company

Role

Who you are

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 institution
Strong desire to perform and grow as a security engineer, and mentor other engineers
Demonstrated technical initiative and leadership

What the job involves

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
Maintain and develop new capabilities for Subzero, our open-source cold storage system, including the embedded applications that execute on our HSMs

Our take

Block is a financial services technology company comprising of Square, Cash App, Spiral, TIDAL, and TBD. Its biggest brand, Square, offers hardware and software for small to medium-sized businesses enabling them to manage the entire payment lifecycle. It functions similarly to Shopify and Stripe, but has paired online payment processing with physical devices such as registers, payment terminals, and mobile card readers.

The business was originally founded as Square in 2009 by Jack Dorsey of Twitter fame. Already well-established with SMEs all over the globe, Square has significantly benefited from the increased demand for mobile payment systems. Its order management feature remains a go-to tool for small businesses that otherwise didn't have the proper infrastructure in place when demand for home delivery surged.

Square rebranded as Block in December 2021, with the Square brand name remaining in place for their seller business. The company has since come under fire for its security practices, facing lawsuits in relation to a major breach of CashApp user data, and in 2024 announced plans to reduce its workforce in order to cut costs. Despite these setbacks, there is every chance the business will move past this, though it may take some time to rebuild trust in its product.

Kirsty

Company Specialist at Welcome to the Jungle

Insights

19% employee growth in 12 months

Glassdoor (4.1)

Trustpilot (4.3)

Company

Company benefits

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 (1 hour per 26 hours worked (max 80 hours per calendar year to the extent legally permissible) for non-exempt employees and covered by our Flexible Time Off policy for exempt employees)
Learning and Development resources
Paid Life insurance, AD&D, and disability benefits

Company HQ

SoMa, San Francisco, CA

Leadership

Jack Dorsey

(CEO)

Having studied at and dropped out of New York University, Jack founded Twitter in March 2006, where he has served as CEO since. He co-founded Square with Jim in February 2009, and has remained its CEO ever since.

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