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Flywire

Senior Security Engineer I, Application Security

Flywire

Senior Security Engineer I focusing on application security at Flywire. Bridging the gap between robust defense and rapid innovation in payment systems and AI integrated applications.

Posted 5/15/2026full-timeRemote • 🇮🇳 IndiaSeniorWebsite

Tech Stack

Tools & technologies
AWSCloudDockerJavaJavaScriptNode.jsPythonRubyRuby on Rails

About the role

Key responsibilities & impact
  • Act as a technical visionary, bridging the gap between robust defense and rapid innovation
  • Design, prompt-engineer, and deploy automated security review workflows
  • Lead secure design reviews and advanced threat modeling for complex payment systems and AI integrated applications
  • Collaborate frequently with different engineering teams to identify and address security issues
  • Oversee deep-dive technical reviews, moving beyond basic scans to perform source code audits and live application testing on high-risk features
  • Contribute and take ownership for the automated security controls we are building
  • Provide hands-on remediation guidance and mentor junior security or software engineers

Requirements

What you’ll need
  • 5+ years in Application Security
  • Proven experience performing web application penetration tests and vulnerability research
  • Skills in source code auditing, product assessments and interaction with product teams
  • Experience with development of security tools
  • Automation First: A passion for replacing manual, repetitive tasks with intelligent, automated scripts and AI workflows
  • Demonstrated ability to use tools like Claude for security-specific tasks like code summarization, vulnerability detection, and automated fix generation
  • Deep practical knowledge of defending against Prompt Injection, Insecure Output Handling, and Model Inversion
  • Experience with Python, Ruby on Rails, Java and modern web dev (JavaScript, Node.js, etc.)
  • Good knowledge of AWS or similar cloud environments, containerization (Docker), and building/maintaining GitLab CI pipelines
  • Advanced experience with SAST, DAST, and SCA tools
  • Deep understanding of applied cryptography, OAuth2, SAML, and SSO implementations
  • Ability to translate complex AI-generated findings into actionable business risks for stakeholders
  • Empathy-Driven Security: A collaborative approach that treats developers and product teams as partners, focusing on enablement rather than friction.

Benefits

Comp & perks
  • Competitive compensation
  • Employee Stock Purchase Plan (ESPP)
  • Flying Start - Our immersive Global Induction Program (Meet our Execs & Global Teams)
  • Wellbeing Programs (Mental Health, Wellness, Yoga/Pilates/HIIT Classes) with Global FlyMates
  • Competitive time off including FlyBetter Days to volunteer in a cause you believe in and Digital Disconnect Days!
  • Great Talent & Development Programs (Managers Taking Flight – for new or aspiring managers!)

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools
Application Securityweb application penetration testingvulnerability researchsource code auditingsecurity tools developmentPythonRuby on RailsJavaJavaScriptNode.js
Soft Skills
technical visionarycollaborationmentorshipremediation guidanceempathy-driven securitycommunicationleadershipproblem-solvingownershipenablement