Responsibilities
- Perform security-focused code reviews and recommend practical fixes.
- Partner with product and engineering teams on threat modeling and application security reviews.
- Investigate, reproduce, triage, and help remediate vulnerabilities in web and mobile applications.
- Support the bug bounty program by investigating reports and coordinating remediation.
- Support preparation of security releases.
- Develop reusable security patterns, processes, and automated tooling to prevent security issues.
Requirements
- At least 5 years of relevant experience.
- Software development experience in one or more of Python, Elixir, or JavaScript.
- Ability to identify application security vulnerabilities through code review, threat modeling, and security reviews.
- Ability to investigate, reproduce, and triage web and mobile application vulnerabilities.
- Strong communication and collaboration skills for explaining security risks and recommendations.
- Practical problem-solving approach and interest in building reusable security tools and processes.
Benefits
- Flexible time off and company-wide holidays, including spring and winter breaks.
- Medical, dental, and vision insurance options.
- Work-from-home support, including a home office setup allowance and monthly cell phone and internet allowance.
- Wellness and childcare allowances, plus family-planning benefits.
- 401(k) plans with employer matching up to 4% of base salary in the US and international pension plans.
- Monthly allowance to use the Whatnot app as both a buyer and seller.
- 16 weeks of paid parental leave plus one month of gradual return to work.
- Flexible work from home or from a global office hub; employees must live within commuting distance of the Dublin hub.
Tech Stack
Categories
About Whatnot
Whatnot is the largest livestream shopping platform in the US, UK, and Europe. Millions of people come to Whatnot every day to buy, sell, and connect over the things they love, from sneakers to sports cards, vintage fashion to fine jewelry, comics to Pokémon, beauty, electronics, and hundreds of other categories. In 2025, live sales on Whatnot surpassed $8B, more than doubling the year before. Over 20 million accounts were created last year alone, and we have been the #1 shopping app in both the US and UK. We've built a real business, but we're nowhere near done. Live commerce at this scale has never been done in the West, which means the people here now are shaping how an entirely new industry develops. The pace here is fast and the expectations are high. We move quickly, prioritize ruthlessly, and trust people to own their work end-to-end. In return, careers grow faster, impact is real, and your colleagues will raise your standards. It's an environment built for people who want to do the best work of their careers alongside others doing the same. We're a remote, co-located team with hubs in the US, UK, Ireland, Poland, and Germany, and we're hiring across every function.