Security Engineer/Tester

  •  Reference Number: 401585
  •  Posted: 06/17/2026
  •  Job Type: Contract

Our client, a leading organization in the technology and security sector, is seeking a Security Engineer/Tester to join their dynamic team. As a Security Engineer/Tester, you will be instrumental in performing authorized security testing on complex, large-scale, and highly critical applications. Your proactive approach and keen understanding of the evolving threat landscape will help safeguard vital systems and data. The ideal candidate will demonstrate strong analytical skills, excellent communication abilities, and a passion for security innovation, aligning seamlessly with the organization’s mission to maintain top-tier security standards.

Job Title:Security Engineer/Tester

Location:Seattle, WA

What's the Job?

  • Perform authorized security testing on complex enterprise applications to identify vulnerabilities early in the development cycle.
  • Collaborate closely with development teams to understand security issues and facilitate effective remediation strategies.
  • Work as a liaison between the InfoSec team and developers, translating technical findings into understandable insights for leadership and management.
  • Stay updated with the latest security threats, vulnerabilities, and industry best practices to ensure continuous improvement of security measures.
  • Utilize a variety of security testing tools and techniques, including manual and automated testing, to evaluate application security posture.

What's Needed?

  • At least 3 years of experience in software development or testing within large-scale enterprise environments.
  • Proficiency in manual and automated testing methodologies, especially in security contexts.
  • Deep understanding of web application technologies, protocols (HTTP, HTTPS), and browser behaviors.
  • Knowledge of application security domains such as authentication, authorization, identity management, and cryptography.
  • Experience with security testing tools like Fiddler, Burp Suite, static code analysis tools, and familiarity with OWASP Top 10, SANS Top 25, CWE vulnerabilities.

What's in it for me?

  • Opportunity to work on high-impact, critical security projects that shape the future of enterprise security.
  • Collaborate with a talented team of security professionals and developers committed to innovation and excellence.
  • Gain exposure to the latest security technologies, standards, and threat mitigation strategies.
  • Work in a supportive environment that values continuous learning and professional growth.
  • Potential for contract-to-hire opportunity with no sponsorship required now or in the future.

Upon completion of waiting period, consultants are eligible for:

  • Medical and Prescription Drug Plans
  • Dental Plan
  • 401(k), Plus Match
  • Weekly Pay

If this is a role that interests you and you'd like to learn more, click apply now and a recruiter will be in touch with you to discuss this great opportunity. We look forward to speaking with you!

About ManpowerGroup, Parent Company of: Manpower, Experis, Talent Solutions, and Jefferson Wells.

ManpowerGroup® (NYSE: MAN), the leading global workforce solutions company, helps organizations transform in a fast-changing world of work by sourcing, assessing, developing, and managing the talent that enables them to win. We develop innovative solutions for hundreds of thousands of organizations every year, providing them with skilled talent while finding meaningful, sustainable employment for millions of people across a wide range of industries and skills. Our expert family of brands – Manpower, Experis, Talent Solutions, and Jefferson Wells – creates substantial value for candidates and clients across more than 75 countries and territories and has done so for over 70 years. We are recognized consistently for our diversity - as a best place to work for Women, Inclusion, Equality and Disability and in 2023 ManpowerGroup was named one of the World's Most Ethical Companies for the 14th year - all confirming our position as the brand of choice for in-demand talent.

Seattle, WA

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