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Leads a server team to design and improve Toss Payments’ core infrastructure, balancing domain boundaries and driving technical decisions to enhance financial experiences.
Owns fintech products that simplify tax and income management for millions of users, turning complex regulations into intuitive experiences.
Owns fintech products like payments, lending, or ads at Toss, setting goals, running experiments, and iterating to improve user outcomes and business metrics.
Owns the lifecycle of Toss’s ad products, from defining KPIs and business models to launching features, analyzing performance, and iterating with stakeholders.
Owns core commerce features like ads, order flow, search, and promotions for Toss Shopping, a fast-growing B2C ecommerce platform.
Leads quality assurance for Toss’s mobile apps and web services, defining test plans and improving QA processes to prevent defects in a fast-moving fintech product.
Oversee quality assurance for Toss Shopping’s mobile and web services, leading testing plans, defect management, and process improvements for a fast-growing e-commerce domain.
Develops and maintains core insurance CRM, ERP, and CMS systems for agents, focusing on automation, security, and scalability using Kotlin/Java and Spring Boot.
Builds and maintains scalable backend services powering Toss’s fintech products like payments, loans, and ads using Kotlin/Spring, MySQL, Kafka, and Redis.
Builds and scales high-traffic ad-serving backends for Toss’s in-app ad platform, using Kotlin/Spring and distributed systems like Kafka and Redis.
Builds and maintains Toss’s core authentication, fraud detection, and B2B platform services that power the entire fintech app ecosystem.
Build and maintain the core server platform for Toss’s fintech services using Java/Kotlin and Spring, focusing on scalability, monitoring, and distributed systems.
Builds and operates backend platforms for payments, settlements, contracts, and personalized services at a leading South Korean fintech company.
Builds, troubleshoots, and operates server/storage/backup systems and cloud/IDC infrastructure that power Toss Payments’ fintech services.
Lead the frontend team at Toss Income, building and scaling web apps inside the Toss app ecosystem using React, TypeScript, and Next.js to improve tax and income services.
Leads the Data Platform team at Toss, building and operating scalable data pipelines and distributed systems (Hadoop, Kafka, Spark, Flink) to power real-time analytics and services for Korea’s leading fintech app.
Owns fintech products at Toss, setting goals, defining metrics, and driving experiments to improve user growth, retention, and monetization.
Owns the search experience for Toss Commerce, defining architecture and experiments for query understanding, retrieval, and ranking to improve product discovery.
Designs, builds, and operates GPU infrastructure for AI/ML workloads, including bare-metal clusters, networking, and monitoring.
Designs high-quality visuals for Toss’s banking and fintech products, from brand identity to mobile UI, using prototyping and creative tools to elevate user experience.
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