Senior Security Engineer, Application Security

Flywire

Senior Security Engineer I at Flywire focusing on application security by bridging traditional security architecture with AI technologies. Collaborate with engineering teams to secure high-stakes payment systems.

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

Tech Stack

Tools & technologies

AWSCloudDockerJavaJavaScriptNode.jsPythonRubyRuby on RailsSDLC

About the role

Key responsibilities & impact

Design, prompt-engineer, and deploy automated security review workflows, using for example Claude or other LLM APIs to perform real-time code analysis and architectural reviews within our CI/CD environment.
Lead secure design reviews and advanced threat modeling for our complex payment systems and AI integrated applications.
Act as a technical bridge between Security and Engineering teams.
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 and take an active part in every aspect of the secure software development lifecycle (S-SDLC).
Provide hands-on remediation guidance and mentor junior security or software engineers, also members of Product teams, on both traditional exploits and emerging AI-specific vulnerabilities.

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
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
Experience building custom tools or wrappers that leverage LLMs to analyze pull requests and provide context-aware security feedback
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
A collaborative approach that treats developers and product teams as partners, focusing on enablement rather than friction
Practical experience aligning technical controls with standards like SOC 1, SOC 2, PCI-DSS, and emerging AI-governance frameworks.

Benefits

Comp & perks

Competitive compensation
Employee Stock Purchase Plan (ESPP)
Flying Start - Our immersive Global Induction Program (Meet our Execs & Global Teams)
Work with brilliant people that will keep you on your toes, learn more about their journeys by checking out #InsideFlywire on social media
Dynamic & Global Team (we have been collaborating virtually for years!)
Wellbeing Programs (Mental Health, Wellness, Yoga/Pilates/HIIT Classes) with Global FlyMates
Be a meaningful part in our success - every FlyMate makes an impact
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 testingsource code auditingsecurity tool developmentPythonRuby on RailsJavaJavaScriptNode.jsSAST

Soft Skills

collaborationmentoringcommunicationproblem-solvingenablementleadershiptechnical bridgingguidanceownershippassion for automation