Sr Product Security Engineer / Pen Tester (Hybrid - Pleasanton, CA)

About the positionResponsibilities• Lead penetration testing engagements focused on payment abuse, transaction manipulation, and business logic exploitation. • Design and execute automated attack simulations to test our defenses against:Carding and BIN attacks• Credential stuffing and account takeovers• Checkout and payment flow abuse• API-level enumeration and fraud• Build custom tooling and frameworks to mimic the behavior of real-world fraudsters and cybercriminals. • Partner with fraud engineering, product security, and risk teams to identify weak points in our controls, detection systems, and architecture.• Conduct threat modeling and red teaming exercises related to payments, authentication, and user account abuse. • Document findings in technical reports with clear risk impact, exploitability, and remediation guidance. • Mentor junior testers and contribute to a culture of security innovation and continuous improvement. Requirements• 7+ years of experience in offensive security, penetration testing, or red teaming. • Strong background in payment systems, financial fraud tactics, and transaction-level attack surfaces.• Fluency in scripting and automation (e.g., Python, JavaScript, Go, Bash) to simulate attacker workflows at scale. • Familiarity with tools like Burp Suite Pro, Selenium, Scapy, ffuf, SQLMap, Metasploit, and bot automation frameworks. • In-depth knowledge of fintech technologies (e.g., tokenized payments, card vaulting, 3DS, ACH, real-time payment APIs). • Solid grasp of common attacker techniques: carding, fake identity generation, bypassing rate limits, evading fraud filters, and abusing web/app logic.• Strong communication skills for explaining findings to both technical and non-technical audiences. • Certifications: OSCP, OSEP, GWAPT, GPEN, GCPN, GXPN, GX-PT, CPSA/CRSA by CREST, CHECK, or TIGER. Nice-to-haves• Prior experience in a fintech, digital banking, or payment gateway environment. • Familiarity with OWASP Automated Threats, PCI DSS, MITRE ATT&CK for Financial Services, or fraud detection systems. • Experience building or testing real-time risk scoring engines and fraud defense pipelines.Benefits• 401k with employer match• medical• dental• vision• 12 paid holidays in the year 2025• 1 hour of sick pay accrual for every 30 hours worked• parental leave• life insurance• disability insurance• accident and illness insurance• health and dependent care flexible spending accounts• wellness benefits• flexible time off for all full-time employees Apply tot his job