Staff Application Security Engineer

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Staff Application Security Engineer based in the United States. This is a senior security engineering opportunity focused on protecting applications, infrastructure, and software systems at scale. You will take ownership of application security programs while partnering closely with engineering and infrastructure teams. The role combines threat detection, vulnerability management, security testing, incident response, and security tooling. You will help build scalable security processes and integrate security practices directly into modern development and delivery workflows. The position offers significant autonomy, requiring strong technical judgment and the ability to navigate complex and ambiguous security challenges. You will also serve as a trusted security advisor and mentor, helping engineering teams strengthen their security practices. This is a remote opportunity within the United States, offering the chance to make a broad impact in a fast-moving, high-ownership environment.