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Builds and operates scalable backend systems for a Korean fintech super-app’s financial marketplace, handling loans, cards, insurance, and accounts while integrating AI-driven automation.
Builds and maintains Toss’s core authentication, fraud detection, and B2B platform services that power the entire fintech app ecosystem.
Develops and optimizes high-performance real-time trading platforms (e.g., stock market data feeds) for Toss Securities, designing scalable architectures for APIs/WebSockets, low-latency event processing, and inter-institution communication using Go, Kotlin/Spring, and Kafka.
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 high-availability platform services for Toss Bank, including messaging, API gateways, monitoring, and caching, using Kotlin/Java and Spring ecosystems.
Builds shared backend services and frameworks in Java/Kotlin with Spring to help teams launch and scale securities services efficiently.
Builds and operates backend platforms for payments, settlements, contracts, and personalized services at a leading South Korean fintech company.
Build and maintain server-side components for Toss Securities using Java/Kotlin, Spring, Redis, Kafka, and Kubernetes, focusing on high-traffic trading systems and real-time data processing.
Builds and maintains the backend for Toss’s consumer-facing apps (payments, shopping, ads, etc.) using Kotlin, Spring, and distributed systems at scale.
Builds and scales server systems for Toss Income, a fintech service simplifying tax refunds and income management using Kotlin, Spring, and AWS.
Designs and develops high-availability, scalable server systems for Toss’s offline payment solutions, focusing on system architecture, real-time traffic handling, and end-to-end service reliability using Java/Kotlin, Spring, Kafka, and cloud-native tools.
Builds and maintains scalable, secure banking services using Kotlin/Java and Spring, focusing on high-traffic systems and innovative fintech products in a collaborative squad model.
Builds and maintains backend services for Toss’s fintech platform, focusing on scalability and reliability.
Builds and operates resilient payment infrastructure, focusing on stability, scalability, and low latency using Java, Kubernetes, and observability tools.
Builds and maintains core financial infrastructure for a leading payments and fintech platform.
Leads the System Security team at Toss Bank, designing and operating endpoint and system security solutions to protect customers from external threats while collaborating with product and compliance teams.
Builds, troubleshoots, and operates server/storage/backup systems and cloud/IDC infrastructure that power Toss Payments’ fintech services.
Builds and optimizes virtualized infrastructure (VMware, KVM) for Toss Securities, integrating with Kubernetes and designing monitoring solutions to support high-traffic financial 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.
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