Senior Software Engineer, Application Security

The mission of the Application Security (AppSec) team is to provide best in class tooling for account management, authentication, authorization, and data security and integrity to protect the data of our 250,000+ customers and the data they own across their ecosystem. 

The Appsec team focuses on the backend development and service architecture for our authentication & authorization services, including identity and access management, logging and auditing, single sign-on, and role based access policies. Along with the services, we own the frontend experience for these features and bring a customer-focused approach to balancing customer ease of use and clear user experiences with each security feature we release. 

As a Senior Software Engineer, you will be responsible for the ownership of key features within the security space, working alongside other experienced engineers and mentoring junior engineers. You will work directly with the team and our product manager to help drive technical conclusions from stakeholders, as well as set our roadmap, team objectives, and goals.

• Mentor and pair with other Klaviyo engineers to build better software by focusing on performance, self-healing systems, configuration as code, defensive programming, application security, etc.
• Prototype and advocate for architectural improvements to achieve breakthrough results in Klaviyo systems’ operational scalability and reliability
• Design and develop systems and processes that continually increase velocity within the team and our areas of ownership
• Champion best practices by actively collaborating with other teams in a culture that values whiteboarding and technical design review
• Work hand-in-hand with customer facing roles such as our sales and support teams, along with the teams Product Manager, to ship high value features.
• Confidently make informed, data-driven decisions in a fast paced environment with competing priorities