Application Security (AppSec) Engineer

The ideal candidate will combine expertise in secure SDLC, automated security testing, DevSecOps, cloud-native applications, APIs, and manual penetration testing timprove application security posture across web, mobile, and microservices architectures. The role focuses on embedding security testing, vulnerability management, and business logic validation directly intCI/CD pipelines and post-deployment processes, ensuring comprehensive security coverage without impacting engineering velocity.

Our client, a IT Services and Consulting company, is looking for a Application Security (AppSec) Engineer for their Saint Louis, MO location.
 
Responsibilities:

• The role focuses on embedding security testing, vulnerability management, and business logic validation directly intCI/CD pipelines and post-deployment processes, ensuring comprehensive security coverage without impacting engineering velocity.
• The ideal candidate will combine expertise in secure SDLC, automated security testing, DevSecOps, cloud-native applications, APIs, and manual penetration testing timprove application security posture across web, mobile, and microservices architectures. This aligns with Secure SDLC requirements, including SAST, DAST, SCA, and manual validation activities integrated throughout the development lifecycle.

Application Security Engineering

• Design and implement enterprise-wide Application Security programs for web, mobile, and API-based applications.
• Integrate security controls and testing activities intAgile, DevOps, and CI/CD pipelines.
• Establish automated security gates using SAST, DAST, SCA, IAST, secret scanning, and container security tools.
• Enable continuous post-deployment security validation and risk monitoring.
• Security Testing & Validation
• Conduct manual penetration testing and business logic testing tidentify vulnerabilities beyond automated scanning capabilities.
• Perform authenticated and unauthenticated security assessments of applications and APIs.
• Execute threat modeling, attack-path analysis, and architecture reviews for new applications and platform services.
• Validate remediation effectiveness and secure deployment practices.
• DevSecOps Integration
• Embed security testing intGitHub Actions, Azure DevOps, Jenkins, GitLab, or similar CI/CD platforms.
• Automate vulnerability triage, prioritization, and remediation workflows.
• Develop security-as-code controls and policy enforcement mechanisms.
• Collaborate with engineering teams timplement secure coding practices and shift-left security initiatives.
• Vulnerability Management
• Analyze findings from multiple security tools and eliminate false positives.
• Prioritize vulnerabilities based on business risk, exploitability, and application criticality.
• Track remediation efforts through SDLC and release cycles.
• Develop security metrics, dashboards, and executive reporting.
• Developer Enablement
• Conduct secure coding reviews and developer education sessions.
• Establish security champions programs across engineering teams.
• Provide remediation guidance and hands-on support during application releases.
• Drive adoption of secure development standards and best practices.
• Cloud & API Security
• Assess cloud-native applications deployed across AWS, Azure, GCP, Kubernetes, and container platforms.
• Secure REST, GraphQL, and microservice-based APIs.
• Evaluate infrastructure-as-code (Terraform, ARM, CloudFormation) and container security controls.
• Support software supply chain security initiatives, including SBOM/SCA validation.

 
Requirements:

• What are the top 3 skills required for this role
• Application Security (AppSec)
• Secure SDLC / DevSecOps
• SAST, DAST, IAST, SCA
• Web, Mobile & API Security Testing
• Manual Penetration Testing & Business Logic Testing
• Threat Modelling
• Vulnerability Management
• Secure Code Review
• CI/CD Security Integration
• 8–15 years of experience in Application Security, DevSecOps, or Security Architecture.
• Experience securing large-scale enterprise applications across cloud and hybrid environments.
• Relevant certifications preferred:
• CISSP
• CSSLP
• GWAPT
• OSCP
• CEH
• Azure/AWS Security Certifications
• Years of Experience:   12.00 Years of Experience

 
Why Should You Apply?

• Health Benefits
• Referral Program
• Excellent growth and advancement opportunities