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Principal Blockchain Security Engineer in Remote Washington at PayPal

Date Posted: 7/19/2021

Job Snapshot

Job Description

Fueled by a fundamental belief that having access to financial services creates opportunity, PayPal (NASDAQ: PYPL) is committed to democratizing financial services and empowering people and businesses to join and thrive in the global economy. Our open digital payments platform gives PayPal’s 392 million active account holders the confidence to connect and transact in new and powerful ways, whether they are online, on a mobile device, in an app, or in person. Through a combination of technological innovation and strategic partnerships, PayPal creates better ways to manage and move money, and offers choice and flexibility when sending payments, paying or getting paid. Available in more than 200 markets around the world, the PayPal platform, including Braintree, Venmo and Xoom enables consumers and merchants to receive money in more than 100 currencies, withdraw funds in 56 currencies and hold balances in their PayPal accounts in 25 currencies.

PayPal is hiring a Principal Security Engineer for its Blockchain and Digital Currency organization to expand its security assessment practice. We seek people with the desire and capacity to build and share expertise in the frontier technologies of crypto and blockchain. If you are into blockchain security, product design, penetration testing, smart contract security reviews, and/or fuzzing code, this could be the perfect job for you!

We are looking to expand our core security team by hiring a blockchain Principal Security Engineer who shares our passion for information security and decentralized systems, and our insatiable curiosity of how things work (and break). This role is for a Principal Security Engineer where the ideal candidate would be a seasoned security assessor and Blockchain enthusiast with experience in decentralized system security (e.g. smart contract auditing), who is looking to help secure software at the core of leading projects in the blockchain ecosystem.  

In this role you will:  

  • Provide security guidance on new blockchain products and technologies. 

  • Be responsible for assessing blockchain security vulnerabilities and new blockchain security events. 

  • Conduct security research and vulnerability mining on blockchain public chain and application layer. 

  • Take a supporting and collaborative role in driving internal blockchain security and privacy initiatives. 

  • Interact with the line of business and PayPal cyber leadership community regarding blockchain vulnerabilities and threats.

  • Create effective and pragmatic cryptographic designs leveraging fundamental cryptographic algorithms and the underlying mathematics, such as finite field arithmetic. 

  • Validate state-of-the-art algorithms and protocols across a broad range of architectures, including considerations to side-channel attacks, performance, and memory/code size constraints. 

  • You will become the primary security expert for multiple product lines, and act as the point of contact for engineering and security. 

  • Support engineering with implementing security fixes, ensuring security scanners are utilized correctly and develop strategies to proactively secure their architecture. 

  • Create threat models and leverage them to prioritize time-based on risk impact. 

About You: 

  • Currently, be working on blockchain security-related work. 

  • Have a deep understanding of side-channel attacks and other challenges to modern applied cryptography. 

  • Be familiar with common vulnerability principles and mining skills. 

  • Be familiar with common blockchain development frameworks, experience in static code analysis, reverse engineering experience is a plus. 

  • Have experience in assessing consensus mechanisms. 


We're a purpose-driven company whose beliefs are the foundation for how we conduct business every day. We hold ourselves to our One Team Behaviors which demand that we hold the highest ethical standards, to empower an open and diverse workplace, and strive to treat everyone who is touched by our business with dignity and respect. Our employees challenge the status quo, ask questions, and find solutions. We want to break down barriers to financial empowerment. Join us as we change the way the world defines financial freedom.

PayPal provides equal employment opportunity (EEO) to all persons regardless of age, color, national origin, citizenship status, physical or mental disability, race, religion, creed, gender, sex, pregnancy, sexual orientation, gender identity and/or expression, genetic information, marital status, status with regard to public assistance, veteran status, or any other characteristic protected by federal, state or local law. In addition, PayPal will provide reasonable accommodations for qualified individuals with disabilities. If you are unable to submit an application because of incompatible assistive technology or a disability, please contact us at paypalglobaltalentacquisition@paypal.com.

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