Senior Android Engineer, Security

Brief info about Vinted Our mission is to make second-hand the first choice, and we're looking for people who want to help us get there. Every day, we work together to help our members buy and sell pre-loved clothing and lifestyle items, giving each piece a second life – or even a third. The Vinted Group is made up of three business units that support this mission: Vinted Marketplace is Europe’s leading platform for second-hand fashion and a go-to destination for all kinds of pre-loved items, with a growing range of categories. Our platform connects millions of members across 20+ markets, helping great items find a new life. Vinted Go enhances the shipping experience with a vast network of over 500,000 pick-up and drop-off points, partnering with more than 60 carriers across Europe, with added services like item verification for peace of mind on high-value pieces. Vinted Pay is the newest part of the Vinted Group, dedicated to bringing secure, reliable payments to buyers and sellers across Europe. Seamlessly integrated into the Vinted app, it helps keep every transaction safe, efficient, and easy for our members. Founded in 2008 in Lithuania, Vinted began as a way for friends to find new homes for clothes they no longer needed. In 2019, we became Lithuania's first unicorn! Today, our headquarters remain in Vilnius, and we've grown with offices across Europe, supported by a team of over 2,000 people. Our backers include Accel, EQT Growth, Insight Partners, Lightspeed Venture Partners, Sprints, and TPG. Information about the position We’re looking for a Senior II Android Engineer to join our Marketplace Security domain. The domain owns critical areas like registration and login, stopping bot accounts, and preventing account takeovers. You’ll join a dedicated anti‑bot team that focuses on understanding and combating bot activity and abusive automation on Vinted. The team works at the intersection of marketplace, engineering and security, using both in‑house solutions and carefully selected third‑party tools. This is a greenfield, a discovery‑heavy space. We’re still defining how we measure and tackle bot activity across Vinted, and you’ll play a key role in shaping that on Android. In this position, you’ll - Be the go‑to Android engineer for the anti‑bot area in Marketplace Security - Design and build Android capabilities to detect and mitigate bots and abusive automation - Implement and maintain behavioural and technical signals on Android that feed our bot metrics and decision systems - Design and own shared, SDK‑like Android libraries that other teams can integrate to benefit from bot protections - Work closely with mobile, backend, web, data, and security engineers to understand new bot patterns and respond effectively - Balance strong protections with good UX, performance and privacy for legitimate members - Work with feature flags, metrics and experimentation to roll out changes safely and learn from impact