Join Our Innovative Team! Toss is a dynamic company comprised of various domains, each operating independently yet collaboratively. Our structure includes six domains: Ads & Benefits, Commerce, Pay, Financial Marketplace, Foundation, and Growth. The Ads & Benefits domain began its advertising journey in September 2022, launching a diverse range of advertising products including video ads, banners, live shopping promotions, luck quizzes, and push notifications for money alerts. Within the domain, teams such as Benefit Silo, Ads Platform Team, Ads Performance Team, and Monetization Silo work seamlessly as one. Having experienced explosive growth since the second half of 2022, we are now focused on refining our targeting capabilities to ultimately establish the premier advertising platform. Your Role: Design and develop the Product server utilized by numerous Toss customers. Leverage your knowledge of the advertising domain to create products centered around Ad Serving & Delivery, User Targeting, and ML Logic-based Bidding & Auction systems. Utilize cutting-edge technologies to ensure service reliability while actively listening to user feedback and promptly addressing issues. What You Should Know: This position is ideal for individuals with a background or interest in advertising. While similar to the Server Developer (Product) role in service development, this position specifically focuses on the Ads & Benefits domain. For those interested in flexible placement prior to joining, please consider applying for the [Server Developer (Product)](https://toss.im/career/job-detail?job_id=4071141003) position. Please note that the Toss community is not currently hiring for military service personnel (Industrial Technical Personnel, Professional Research Personnel). Transfers or new hires are not possible. Desired Qualifications: Experience in designing and operating high-availability, scalable systems. Background in developing systems that handle large-scale, real-time traffic. Experience dealing with system failures and resolving issues. A strong commitment to ownership and pride in your work, treating the service as “your own”. Willingness to share insights and ideas gained from service development and an eagerness for continuous technical challenges. Experience in the advertising sector is a plus. Technologies We Use: Kotlin, Spring MySQL, MongoDB, Hadoop, Redis, Kafka, Elasticsearch Our Hiring Process: Application Submission > Technical Interview > Cultural Fit Interview > Reference Check > Offer Discussion > Final Selection and Onboarding A Message to Future Colleagues: “We are looking for individuals eager to grow the Ads & Benefits domain together!” Having started from scratch, Toss's advertising business is now prepared for significant growth, creating a platform for advertisers and offering a variety of user-friendly advertising products.
Mar 26, 2026