Staff AppSec Engineer

Upside•Washington, DC

2d•$210,000 - $230,000•Remote

About The Position

Upside is seeking a Staff AppSec Engineer to transform brick-and-mortar commerce by applying the sophistication of online retail to provide users with more value on everyday purchases and brick-and-mortar businesses with new, profitable customers. The Impact You’ll Make: You'll report to the Director of Information Security and partner closely with engineering and technology stakeholders across the organization. Drawing on your expertise in secure development practices and payment systems, you'll own the identification and remediation of application vulnerabilities end-to-end. This is an individual contributor role with real influence, you'll shape how our AppSec program evolves, raise the security bar across our engineering org, and make it easier for developers to build securely from the start.

Requirements

6+ years in application security or product security, including hands-on experience reviewing Python code
A track record of building and delivering solutions in vulnerability management programs
Deep expertise in AWS security architecture, including Lambda and AWS Control Tower
Demonstrated experience adopting and integrating AI tools into security or engineering workflows
Bachelor's degree in Computer Science, Engineering, or a related field preferred
Strong communication and collaboration skills — you're as comfortable with engineers as you are with leadership

Responsibilities

Leverage AI tools to design and deliver scalable security solutions that address application vulnerabilities
Execute automated security testing (SAST, SCA) and work directly with engineers to resolve findings
Develop threat models and collaborate with product and engineering teams to surface, document, and prioritize risk
Advise leadership on security architecture decisions and application security best practices
Build developer security literacy through training, enablement, and vulnerability management guidance
Participate in penetration testing efforts and support bug bounty program operations
Contribute to the administration of AWS Control Tower and IAM provisioning workflows
Stay current with the broader security community and bring emerging trends back to the team