AppSec - Pen Tester

Web Application Penetration Tester (Application Security)

Overview
We are seeking an experienced Web Application Penetration Tester to support in-house application security testing across a modern software development environment. This role focuses on identifying risk throughout the secure software development lifecycle (SDLC) and serves as a subject matter expert in web application, API, and cloud security.
You will work closely with development and engineering teams to uncover vulnerabilities, validate exploitability, and provide clear, actionable proof-of-concept findings that drive remediation and improved security posture.

Key Responsibilities

• Conduct web application and API penetration testing to identify vulnerabilities in application design and implementation.
• Perform hands-on testing against scoped applications, including exploit validation and proof-of-concept development.
• Apply OWASP testing methodologies to evaluate application security controls and identify real-world risk.
• Review technical design documentation to ensure security requirements are incorporated early in the development lifecycle.
• Partner with application and engineering teams to provide guidance on secure architecture patterns across web, API, and cloud environments.
• Assess emerging application security tools, standards, authentication protocols, and technologies to identify gaps and opportunities for improvement.
• Help influence a strong secure-by-design development culture through education, collaboration, and best practices.
• Communicate application security risks and findings clearly to both technical and non-technical audiences.

Required Skills & Experience

• Hands-on experience performing web application and API penetration testing in an enterprise environment.
• Strong practical knowledge of OWASP Top 10 and common web application attack techniques.
• Experience using tools such as Burp Suite for application testing and vulnerability validation.
• Ability to scope applications, execute targeted testing, and validate whether vulnerabilities are exploitable.
• Solid understanding of secure software development concepts and application security architecture.
• Strong analytical and problem-solving skills with the ability to work independently or collaboratively.
• Ability to clearly document findings and present security risk in a clear, actionable manner.

Preferred Qualifications

• Experience testing applications in cloud-based environments.
• Familiarity with authentication and authorization mechanisms (OAuth, token-based auth, APIs).
• Background working closely with development teams to support remediation efforts.
• Exposure to application security within regulated or enterprise environments.
• Interest or experience areas adjacent to AI-enabled applications, threat analysis, or modern application architectures.

Why This Role

This is a hands-on, in-house application security role focused on real testing, real exploitation, and real impact-not just running scans. You'll be part of a team responsible for helping developers build more secure applications by identifying true risk, validating findings, and influencing better security outcomes across the organization.
Job Type & Location
This is a Contract to Hire position based out of Richardson, TX.
Pay and Benefits
The pay range for this position is $80.00 - $80.00/hr.
Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following:
Medical, dental & vision
Critical Illness, Accident, and Hospital
401(k) Retirement Plan - Pre-tax and Roth post-tax contributions available
Life Insurance (Voluntary Life & AD&D for the employee and dependents)
Short and long-term disability
Health Spending Account (HSA)
Transportation benefits
Employee Assistance Program
Time Off/Leave (PTO, Vacation or Sick Leave)
Workplace Type
This is a fully onsite position in Richardson,TX.
Application Deadline
This position is anticipated to close on May 21, 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 TEKsystems.com.

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