Senior Application Security Engineer

Company Description
Block is one company built from many blocks, all united by the same purpose of economic empowerment. The blocks that form our foundational teams - People, Finance, Counsel, Hardware, Information Security, Platform Infrastructure Engineering, and more - provide support and guidance at the corporate level. They work across business groups and around the globe, spanning time zones and disciplines to develop inclusive People policies, forecast finances, give legal counsel, safeguard systems, nurture new initiatives, and more. Every challenge creates possibilities, and we need different perspectives to see them all. Bring yours to Block.
Job Description
Protect the Future of Finance
Block's Offensive Security team is on a mission to safeguard the financial systems of tomorrow. We're seeking a seasoned Senior Application Security Engineer to join our elite squad of security engineers. As a key player on our team, you'll be responsible for identifying and crushing security vulnerabilities in our applications, ensuring the integrity of our systems, and protecting the trust of our customers. We don't throw security problems over the wall. We understand the struggle of our engineers and provide contextual guidance for a diverse, complex and cutting edge tech stack that enables the business. We don't work in isolation, engineering and security teams at Block are our partners. We collaborate with our partners at every opportunity we can find and place the needs of our partners at the highest priority.
Your Mission:

• Conduct penetration tests, source code reviews, and design reviews to uncover hidden security threats
• Participate in red and purple team operations, outsmarting attackers and fortifying our defenses
• Dive deep into our tech stack to develop a mastery of our applications and services
• Stay one step ahead of threat actors, understanding their tactics and motivations
• Review and improve the designs of complex systems, ensuring they're secure by design
• Communicate critical security findings to cross-functional teams, providing contextual remediation steps and guiding resolutions every step of the way
• Help respond to incidents and reproduce bug bounty reports.

Qualifications
Your Secret Weapons:

• 5+ years of experience in penetration testing, with a proven track record of being able to write proof-of-concept exploits that demonstrate impact.
• Exceptional communication, collaboration, and problem-solving skills.
• Ability to work independently, managing multiple projects with ease and navigating technically complex apps and services.
• In-depth knowledge of secure design patterns
• Bonus points for experience with:
  • AWS Security
  • AI Security
  • Red teaming
  • Kubernetes and Docker security
  • Mobile app security

What You'll Get:

• The opportunity to make a real impact on the security of our applications and the financial industry as a whole.
• A collaborative and dynamic work environment with a team of security experts.
• Freedom to do security research that has the potential to have a deep impact on Block.
• An environment where conference presentations are highly encouraged.

Qualifications
Your Secret Weapons:

• 5+ years of experience in penetration testing, with a proven track record of being able to write proof-of-concept exploits that demonstrate impact.
• Exceptional communication, collaboration, and problem-solving skills.
• Ability to work independently, managing multiple projects with ease and navigating technically complex apps and services.
• In-depth knowledge of secure design patterns
• Bonus points for experience with:
  • AWS Security
  • AI Security
  • Red teaming
  • Kubernetes and Docker security
  • Mobile app security

What You'll Get:

• The opportunity to make a real impact on the security of our applications and the financial industry as a whole.
• A collaborative and dynamic work environment with a team of security experts.
• Freedom to do security research that has the potential to have a deep impact on Block.
• An environment where conference presentations are highly encouraged.