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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.
Leads a team that designs and executes security audits, compliance checks, and internal control improvements for a digital bank, ensuring adherence to financial regulations and mitigating risks.
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 refactors core banking systems (accounting layer) using Java/Kotlin and Spring, migrating legacy monoliths to scalable microservices for Toss Bank’s digital finance platform.
Builds and operates scalable backend services for Toss’s offline payment platform using Java/Kotlin, Spring, Kafka, and Kubernetes.
Builds and operates core commerce systems (search, recommendations, orders, payments, ads) for Toss Shopping, a fast-growing B2C marketplace, using Kotlin/Spring and distributed data stacks.
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.
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 and maintains the backend for Toss’s consumer-facing apps (payments, shopping, ads, etc.) using Kotlin, Spring, and distributed systems at scale.
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.
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.
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 intuitive global financial apps and experiences for Toss, from UX research to pixel-perfect UI, across payments, remittances, and shopping.
Performs regular and ad-hoc security assessments, penetration testing, and vulnerability analysis for a digital bank’s infrastructure, systems, and applications using Python, Django, and cloud-native tools.
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