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Whatnot

Application Security Engineer

Whatnot

. Perform security-focused code reviews, identifying vulnerabilities and recommending practical fixes .

Posted 10/6/2026full-timeDublin • IrelandMid-LevelSeniorWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in security-focused code reviews, vulnerability identification, and remediation in web and mobile applications. Proficient in collaborating with product and engineering teams to integrate security into the software development lifecycle.

Highest-signal resume keywords
Security-Focused Code ReviewsPython DevelopmentThreat ModelingApplication SecurityVulnerability Investigation

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Code ReviewVulnerability IdentificationSecurity RemediationThreat ModelingApplication Security RisksWeb Application SecurityMobile Application SecurityAutomated Tooling DevelopmentSecurity Patterns DevelopmentSoftware Development
Soft Skills
Strong CommunicationCollaboration SkillsProblem-Solving Approach
Industry Keywords
Bug Bounty ProgramSecurity ReleasesSecurity ProcessesSecurity Issues PreventionDublin Hub

Tech Stack

Tools & technologies
ElixirJavaScriptPython

About the role

Key responsibilities & impact
  • Perform security-focused code reviews, identifying vulnerabilities and recommending practical fixes
  • Partner with product and engineering teams on threat modeling and application security reviews
  • Help teams reproduce, triage, and address security vulnerabilities in web and mobile applications
  • Support the bug bounty program by investigating reports and working with teams on remediation
  • Support the preparation of security releases
  • Help develop security patterns, processes, and automated tooling that prevent entire classes of security issues
  • Collaborate with product and engineering teams to build security into software development
  • Participate in an in-person onboarding experience at one of the company's offices

Requirements

What you’ll need
  • 5 years of relevant experience
  • Software development experience in one or more of Python, Elixir, or JavaScript
  • Ability to review code for security vulnerabilities and work with engineers to implement effective fixes
  • Understanding of application security risks and how to identify them through threat modelling and security reviews
  • Ability to investigate, reproduce, and triage web and mobile application vulnerabilities
  • Strong communication and collaboration skills, with the ability to explain security risks and recommendations clearly to product and engineering teams
  • Practical approach to problem-solving and interest in building reusable tools and processes that help prevent security issues
  • Must live within commuting distance of the Dublin hub

Benefits

Comp & perks
  • Flexible Time off Policy and Company-wide Holidays (including a spring and winter break)
  • Health Insurance options including Medical, Dental, Vision
  • Work From Home Support
  • Home office setup allowance
  • Monthly allowance for cell phone and internet
  • Care benefits
  • Monthly allowance for wellness
  • Annual allowance towards Childcare
  • Lifetime benefit for family planning, such as adoption or fertility expenses
  • Retirement; 401k offering for Traditional and Roth accounts in the US (employer match up to 4% of base salary) and Pension plans internationally
  • Monthly allowance to dogfood the app
  • Parental Leave
  • 16 weeks of paid parental leave + one month gradual return to work