Application Security Engineer

Location: St. Louis

Description
In partnership with the AI / Application Security Architect, contribute to detailed technical design and operationalize security architecture, standards, and approved security patterns across application and AI-enabled systems. Partner directly with engineering teams to embed security controls and secure-by-design practices into the software development lifecycle and AI lifecycle. Evaluate, test, and perform technical validation of AI and application security tools, including AI red teaming, AI and MCP gateways, DAST, SAST, SCA, API security, and mobile application security capabilities.

Implement, integrate, tune, and scale security tooling across application and AI environments, including runtime monitoring, governance controls, testing platforms, and posture management capabilities, with a focus on coverage, signal quality, and operational effectiveness. Leverage AI and automation to scale security operations, vulnerability management, and developer enablement through technologies such as Python, AWS services, and CI/CD pipelines. Triage, validate, and prioritize vulnerabilities identified through application and AI security tools;

assess risk in business and technical context; and partner with engineering teams to drive timely remediation. Provide hands-on guidance to developers, including low-code and no-code users, on secure development practices, platform-specific risks, secure integration patterns, and remediation approaches. Support the security review and risk assessment of AI platforms, models, agents, skills, MCPs, and third-party integrations by applying defined controls, documenting risk decisions, and helping establish scalable onboarding and governance practices.

Develop, maintain, and improve secure coding standards, implementation guidance, guardrails, and technical documentation for both application and AI use cases. Stay current on emerging cybersecurity threats, particularly in AI security, and incorporate relevant mitigations into security tooling, engineering practices, and control design. Contribute to a strong security engineering culture by mentoring junior engineers, sharing technical knowledge, and helping mature application and AI security practices across the organization.

Skills

Application security, Vulnerability, Aws, Cyber security, Sast, ci/cd pipelines

Top Skills Details

Application security,Vulnerability,Aws,Cyber security

Additional Skills & Qualifications
Minimum

Required:

Bachelor's degree in Computer Science, Information Systems, Cybersecurity, Computer Engineering, Software Engineering; or a related combination of education and experience. Minimum

Required:

4-6+ years of information security or software development experience.

Experience Level

Intermediate Level

Job Type & Location
This is a Permanent position based out of Saint Louis, MO.
Pay and Benefits
The pay range for this position is $100000.00 - $150000.00/yr.
Offer an entrepreneurial environment, comprehensive benefits package to include health, dental and vision care, 401k (matching up to 6%), life insurance, and paid time off.
Workplace Type
This is a fully onsite position in Saint Louis,MO.
Final date to receive applications
This position is anticipated to close on Jun 23, 2026.

About TEKsystems

We're partners in transformation. We help clients activate ideas and solutions to take advantage of a new world of opportunity. We are a team of 80,000 strong, working with over 6,000 clients, including 80% of the Fortune 500, across North America, Europe and Asia. As an industry leader in Full-Stack Technology Services, Talent Services, and real-world application, we work with progressive leaders to drive change.

That's the power of true partnership. TEKsystems is an Allegis Group company.

The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

About TEKsystems and TEKsystems Global Services

We're a leading provider of business and technology services. We accelerate business transformation for our customers. Our expertise in strategy, design, execution and operations unlocks business value through a range of solutions. We're a team of 80,000 strong, working with over 6,000 customers, including 80% of the Fortune 500 across North America, Europe and Asia, who partner with us for our scale, full-stack capabilities and speed.

We're strategic thinkers, hands-on collaborators, helping customers capitalize on change and master the momentum of technology. We're building tomorrow by delivering business outcomes and making positive impacts in our global communities. TEKsystems and TEKsystems Global Services are Allegis Group companies. Learn more at

The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status,…