Staff Security Engineer, Application Security

NinjaTrader is an industry-leading trading platform and futures broker focused on empowering traders through innovative products and brokerage services. The Staff Security Engineer, Application Security will help scale and mature the security program by owning key security domains, integrating security into engineering workflows, and developing automation and tooling. The role will also guide vulnerability remediation, conduct threat modeling and security assessments, and contribute to incident response.

Responsibilities:

• Own key security domains such as vulnerability management, application security, API security, and supply chain security
• Drive improvements in security coverage, prioritization, and remediation workflows
• Partner with engineering teams to integrate security into design reviews, threat modeling, CI/CD pipelines, and developer workflows
• Provide actionable, pragmatic guidance that helps teams ship securely
• Develop and improve security tooling and automation to reduce manual effort
• Implement and tune tools for SAST, SCA, DAST, dependency security, and container security
• Leverage AI/LLMs where appropriate to improve triage, detection, and review processes
• Triage and prioritize vulnerabilities using risk-based approaches
• Partner with teams to ensure timely remediation of critical issues
• Help define and improve SLAs, metrics, and reporting
• Conduct threat modeling, design reviews, and security assessments
• Contribute to incident response and postmortems for security events
• Identify and help remediate systemic risks

Requirements:

• 7+ years of experience in Application Security, Product Security, or Security Engineering
• Strong hands-on experience with threat modeling and secure design
• Experience with vulnerability management and application security tooling
• Experience working in cloud-native environments such as AWS and GCP
• Experience integrating security into CI/CD pipelines and developer workflows
• Ability to write code in Python, Go, or similar languages for automation and tooling
• Strong ability to work cross-functionally with engineering teams
• Experience scaling security in a high-growth or late-stage startup
• Familiarity with AI-driven security workflows or automation
• Background in API security, data protection, or multi-tenant systems
• Experience with bug bounty programs and penetration testing
• Security certifications such as CISSP