Application Security Engineer

Whatnot • Application Security • Commerce • 3 days ago
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Salary
≈ $78k – $140k per year (Estimated)
Location
In office (Kraków)
Seniority
Senior · 5+ years exp
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 12, 2026. First seen by Alion on Oct 7, 2026. Whatnot scores C on the Alion truth index.

Overview
Company
Impact
Profile match

Whatnot

Whatnot is a US live shopping marketplace headquartered in San Francisco where sellers host livestreams to sell trading cards, collectibles, fashion, electronics, live plants and many other categories. Founded in 2019 and backed by investors including Andreessen Horowitz, Y Combinator and CapitalG, it operates in North America, Europe, Australia and Japan with teams in New York, Los Angeles, London, Dublin, Berlin, Krakow, Sydney and Tokyo. It hires software and application security engineers, product designers, sales managers for international markets, recruiters, communications managers and finance and tax staff.
whatnot.com • HQ: San Francisco, United States • Marketplaces • Commerce • Social Commerce • 1001-5000 employees • Est. 2019
Tech stack of Whatnot
Backed by Sequoia Capital, Y Combinator, Andreessen Horowitz

Join Whatnot, the largest live shopping platform in North America and Europe. As an Application Security Engineer, you will help protect our products and systems, partner with product and engineering teams, and support our bug bounty program. You should have 5 years of relevant experience, software development experience, and strong communication skills.

Missions

  • 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.
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