Senior Offensive Security Engineer (Web & API)
~ Contract

You are an experienced offensive security professional with strong manual penetration testing expertise and a disciplined approach to testing production environments. You validate vulnerabilities through controlled exploitation attempts and produce clear, reproducible evidence.
You are comfortable testing web applications, REST/SOAP APIs, and applications protected by enterprise SSO. Note: This role operates under a contractor model for an initial period of 2 months , with the possibility of extension.
Bachelor's Degree in Computer Science, Cybersecurity, Software Engineering, or a related field is desired, or equivalent professional experience.
~5+ years of hands on penetration testing experience, including 3+ years testing web applications and APIs in production environments.
~ Manual web application penetration testing following OWASP WSTG and the OWASP Top 10.
~ API security testing following the OWASP API Security Top 10, including BOLA/IDOR and broken function level authorization.
~ SOAP and WSDL web service testing using Burp Suite, SoapUI or an equivalent tool.
~ Experience testing applications protected by SSO with OAuth 2.0, OpenID Connect and SAML on Microsoft Entra ID.
~ Multi role and multi account authorization testing methodology.
~ Proven ability to test safely in production, applying rate control, test records and defined stop conditions.
~ Strong spoken and written English (B2+) to document findings and weekly status reports and to join live working sessions with a U.S. based security team.

Experience testing Java EE and JSF enterprise applications, such as loan servicing or core lending platforms.
Experience testing ASP.NET web applications and APIs.
Experience with Azure API Management, Application Gateway or Front Door WAF.
Experience testing payment, e signature and webhook or callback integrations.
Python or Bash scripting to automate test cases.




Prior participation in regulatory penetration tests under NYDFS Part 500, PCI DSS 11.4 or FFIEC.
Offensive security certification such as OSCP, OSWE, GWAPT, GPEN, GXPN or BSCP.
Perform outside unauthenticated testing of in scope web applications, REST and SOAP APIs, an API gateway and internet exposed hosts.
Perform inside testing from client provided accounts, covering cross role and cross account authorization, privilege escalation and access beyond the assigned role.
Discover API specifications such as OpenAPI, WSDL and Postman collections for REST and SOAP services before testing when required.
Test all authorized in scope assets, or document the reason for exclusion when client side dependencies are not met.
Execute all testing without causing service disruption or data loss, escalating stop conditions within one hour.
Report weekly status in English and participate in working sessions with the client security team.
~5+ years of hands on penetration testing, including 3+ years on web applications and APIs in production .
~ Manual testing aligned to OWASP WSTG, OWASP Top 10 and OWASP API Security Top 10 .
~ Burp Suite Professional expertise, including SOAP and WSDL service testing.
~ Authorization testing across multiple roles and accounts in SSO protected applications (Entra ID, OAuth 2.0, OIDC, SAML).

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📌 Senior Offensive Security Engineer (Ciudad de México)
🏢 Applaudo Studios
📍 Ciudad de México