PLEASE NOTE: It is a Hybrid position in Washington, D.C. Metro Clearance Requirement: Public Trust Tier 2 will be required after onboarding SUMMARY: We are seeking an elite Web Developer Security Engineer to serve as Key Personnel, playing a pivotal role in protecting mission-critical web applications, APIs, and sensitive data for the Client. The core objective of this role is to embed robust security principles proactively throughout the Software Development Life Cycle (SDLC). You will drive the end-to-end vulnerability lifecycle, leverage threat modeling and advanced assessments while ensuring compliance with Federal cybersecurity frameworks such as NIST SP 800-53, FISMA, and FedRAMP. KEY RESPONSIBILITIES: Application Security & Vulnerability Management: You will identify, analyze, and neutralize critical vulnerabilities, logic flaws, insecure dependencies, and misconfigurations. You will also provide Tier II support for security operations and recommend continuous security enhanceme...